CN108802192A - A kind of calcarenaceous sandstone reservoir pore space kind identification method - Google Patents
A kind of calcarenaceous sandstone reservoir pore space kind identification method Download PDFInfo
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- CN108802192A CN108802192A CN201710303114.7A CN201710303114A CN108802192A CN 108802192 A CN108802192 A CN 108802192A CN 201710303114 A CN201710303114 A CN 201710303114A CN 108802192 A CN108802192 A CN 108802192A
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Abstract
The present invention provides a kind of calcarenaceous sandstone reservoir pore space kind identification method, pass through the identification of calcarenaceous sandstone lithology, the selection of calcarenaceous sandstone dried layer section, acquisition takes acoustic porosity curve and density porosity curve, and calibration is carried out to density porosity curve and acoustic porosity curve via porosity calibration curve, the porosity type for meeting accounting condition in calcarenaceous sandstone reservoir is identified using the difference degree of density porosity and acoustic porosity, calcium bits shale Lithology Discrimination standard therein and the correspondence of difference degree and the porosity type for meeting accounting condition pass through experimental summary.This method is after Lithology Discrimination standard and correspondence are established, sample need not be acquired again, there is good adaptability for the strong calcarenaceous sandstone reservoir of anisotropism, it is few to overcome previous well rock core, landwaste thin slice data, well number is more, and landwaste selection amount is big, and well section can not identify or divide the problem of calcarenaceous sandstone porosity type entirely, the regional extent of identification has been widened, and has been easy to grasp.
Description
Technical field
The invention belongs to oil-gas exploration, development field more particularly to a kind of calcarenaceous sandstone reservoir pore space kind identification methods.
Background technology
Reservoir pore space type is one of understanding, evaluation reservoir key content, and porosity type can reflect to a certain extent
The Forming Mechanism of reservoir；Different porosity types has different pore structures, can finally cause to be controlled by permeability size
There are greatest differences for development effectiveness.Currently, common utilizes drill cores sample, casting body flake is ground, by being seen under microscope
It examines to determine, or is directly observed under scanning electron microscope using core sample, and then determine the porosity type of a certain target reservoir,
Its distribution characteristics is described, these methods are relatively applicable in the reservoir of relative homogeneous, but stronger for reservoir heterogeneity
The problem of calcarenaceous sandstone reservoir is then less applicable in, is primarily present following two aspects：
(1) due to the limitation of drilling and coring delivery cost etc., it is impossible to carry out large-scale coring in drilling process.Calcium considers sand to be worth doing
Rock is a kind of clastic rock of specific type being mainly made of lithiclast, and porosity type complexity is various, calcarenaceous sandstone and gravel
Rock, conventional sandstone etc. interact, are stacked distribution in transverse direction in the longitudinal direction, and anisotropism is very strong.This makes practical coring and design
There are errors for coring, cause practical coring sample to do the reservoir pore space type of analysis test reflection, cannot really, comprehensively reflect
The porosity type of full well section reservoir.
(2) important achievement one of of the landwaste as drilled well well logging, interval of interest is every 0.5m continuous samplings, by selected
Chip sample is further ground observation and also can recognize that porosity type, but utilization rate or relatively low and right in actual operation
In the more research area of well number, the selection workload of landwaste is too big, causes the distribution of reservoir pore space type in machine and transverse direction special
Sign is difficult to accurate description.
Studies have shown that it is that solution is above-mentioned to identify reservoir rock porosity type using Logging Curves, describe its spatial distribution
One of problem effective way.But in the prior art when such method of practical application, some is only applicable to pure limestone or dolomite, and
Computational methods are indefinite, and some is only applicable to pyroclastic rock, and what is had can only partly identify porosity type, None- identified micropore
Gap, then criterion is excessively general for some, it is difficult to implement.Therefore, for the various calcarenaceous sandstone of porosity type, need to be summarized one
It covers new method porosity type is identified, describes its spatial distribution characteristic, to the further reservoir for calcarenaceous sandstone
Evaluation provides basis.
Invention content
It is above-mentioned in the prior art when judging calcarenaceous sandstone reservoir pore space type to solve, due to drilling and coring delivery cost etc.
Limitation so that coring is few, and since anisotropism is strong, leading to practical coring, there are error, poor, the institutes of coring representativeness with design coring
Take sample that cannot reflect full well section reservoir pore space type really, comprehensively；Well number is more, and the selection workload of landwaste is too big, causes
The distribution characteristics of reservoir pore space type in machine and transverse direction is difficult to accurate description；And existing utilization Logging Curves are sentenced
The technical issues of method of disconnected porosity type is difficult to be applicable in calcarenaceous sandstone reservoir, the present invention provides a kind of calcarenaceous sandstone reservoir pore space
Kind identification method, concrete scheme are as follows：
A kind of calcarenaceous sandstone reservoir pore space kind identification method, includes the following steps：
Choose the interval of interest where calcarenaceous sandstone development section；
Choose the calcarenaceous sandstone dried layer section in the interval of interest；
Obtain the interval transit time porosity curve and density porosity curve of the affiliated well of the interval of interest, and by the mesh
The interval transit time porosity curve of the affiliated well of interval, density porosity curve and the affiliated well of the interval of interest porosity compared with
Positive curve is placed on together in same log road；
On the basis of the porosity calibration curve of the affiliated well of the interval of interest, depth coordinate is constant, in porosity coordinate
By the interval transit time porosity curve of the affiliated well of the interval of interest, density porosity curvilinear translation on direction, make the purpose
The porosity calibration of the density porosity curve, interval transit time porosity curve and the affiliated well of the interval of interest of the affiliated well of interval
Calcarenaceous sandstone dried layer section of the curve in the interval of interest overlaps；
The accounting of porosity type is set；
After calcarenaceous sandstone dried layer section of three porosity curves in the interval of interest overlaps, according to the survey of same well
On well curve, the density porosity of same depth position and the difference degree of interval transit time porosity are considered to be worth doing with calcium at the depth location
The correspondence for meeting the porosity type for presetting accounting condition in sandstone reservoir identifies the calcium bits sand of the affiliated well of the interval of interest
Meet the porosity type for presetting accounting condition in rock reservoir.
Preferably, the accounting of the porosity type is more than 50%, on the log of the same well, same depth position
The difference degree of the density porosity and interval transit time porosity set and satisfaction in calcarenaceous sandstone reservoir at the depth location are default
The correspondence of the porosity type of accounting condition is：
When the density porosity of same depth location subtracts the difference > 3% of interval transit time porosity, the depth location
Reservoir in accounting more than 50% porosity type be intergranular dissolution porosity；
When the density porosity of same depth location subtracts difference >=0.5% of interval transit time porosity, and when≤3%,
Porosity type of the accounting more than 50% is that intergranular corrosion fills hole in the reservoir of the depth location；
When the density porosity of same depth location subtracts the difference < 0.5% of interval transit time porosity, the depth position
Porosity type of the accounting more than 50% is micropore in the reservoir set.
Preferably, the landwaste packet for choosing the interval of interest where known calcarenaceous sandstone development section, therefrom acquires chip sample,
Landwaste chip sample is formed after grinding, together with core wafer sample, observation in detail, analyzes and choose hole class under the microscope
Type meets the sample of accounting condition；
Choose the calcarenaceous sandstone dried layer section in the known interval of interest；
Obtain the interval transit time porosity curve and density porosity curve of the known affiliated well of interval of interest, and by institute
It states belonging to interval transit time porosity curve, density porosity curve and the known interval of interest of the affiliated well of known interval of interest
The porosity calibration curve of well is placed on together in same log road；
On the basis of the porosity calibration curve of the known affiliated well of interval of interest, depth coordinate is constant, in porosity
By the interval transit time porosity curve of the known affiliated well of interval of interest, density porosity curvilinear translation on coordinate direction, make
The density porosity curve of the known affiliated well of interval of interest, the hole of interval transit time porosity curve and the affiliated well of known interval of interest
Calcarenaceous sandstone dried layer section of the porosity calibration curve in the known interval of interest overlaps；
On the density porosity curve and interval transit time porosity curve for reading the affiliated well of the known interval of interest, hole
The corresponding interval transit time porosity of depth where type meets the sample of accounting condition and density porosity, according to reading, result is total
On the log for tying same well, the density porosity of same depth position and the difference degree of interval transit time porosity with should
Meet the correspondence for the porosity type for presetting accounting condition at depth location in calcarenaceous sandstone reservoir.
Preferably, the calcarenaceous sandstone is chosen according to the Lithology Discrimination standard of calcarenaceous sandstone and develops section, the calcarenaceous sandstone
Lithology Discrimination standard be：The ranging from 40API < GR < 55API of natural gamma ray logging, while the range of deep lateral resistivity
For 300 ohm meters<RD<4000 ohm meters.
Preferably, the landwaste packet for choosing the interval of interest where known calcarenaceous sandstone development section, therefrom acquires chip sample,
Landwaste chip sample is formed after grinding, together with core wafer sample, observation in detail, identifies sample lithology under the microscope；
Read depth correspondence where the sample of different lithology on the Logging Curves of the affiliated well of the known interval of interest
Value, and then summarize the Lithology Discrimination standard of the calcarenaceous sandstone.
Preferably, ranging from 1000 ohm meters of deep lateral resistivity are chosen<RD<4000 ohm meters, density are more than
2.65g/cm3, and intervals of the compensated neutron log CNL less than 5% is the calcarenaceous sandstone dried layer section.
Preferably, the corresponding interval transit time value in each depth point of calcarenaceous sandstone dried layer section in any interval of interest and close is read
Angle value, and using the interval transit time value of acquisition and density value as the interval transit time skeleton value of the calcarenaceous sandstone of the interval of interest
With density skeleton value the target zone is calculated separately using interval transit time porosity model and density porosity interpretation model
The interval transit time porosity and density porosity of well belonging to section, and then obtain the interval transit time hole of the affiliated well of the interval of interest
It writes music line and density porosity curve.
Preferably, the porosity calibration curve is neutron porosity curve.
Preferably, the porosity calibration curve is core porosity curve.
Preferably, when the difference degree of the density porosity and interval transit time porosity is that density porosity subtracts sound wave
The absolute value or density porosity and sound wave of the difference or density porosity of poor porosity and the difference of interval transit time porosity
Square of the inverse or density porosity of the absolute value of the difference of time difference porosity and the difference of interval transit time porosity.
Compared with prior art, a kind of calcarenaceous sandstone reservoir pore space kind identification method provided by the invention, passes through selection
The calcarenaceous sandstone dried layer section in interval of interest and the interval of interest where calcarenaceous sandstone development section, and obtain the target zone
The density porosity curve and interval transit time porosity curve of well belonging to section, by the hole of the two and the affiliated well of the interval of interest
Degree calibration curve is placed in together in same log road, and using the porosity calibration curve of the affiliated well of the interval of interest as base
Standard overlaps calcarenaceous sandstone dried layer section of three porosity curves in the interval of interest by way of translation；Providing holes
Porosity type accounting, after calcarenaceous sandstone dried layer section of three porosity curves in the interval of interest overlaps, according to same a bite
On the log of well, the density porosity of same depth position and the difference degree of interval transit time porosity and the depth location
The correspondence for meeting the porosity type for presetting accounting condition in place's calcarenaceous sandstone reservoir identifies the affiliated well of the interval of interest
Meet the porosity type for presetting accounting condition in calcarenaceous sandstone reservoir.This method identifies that calcium considers sand to be worth doing using porosity logging curve
Meet the porosity type for presetting accounting condition in rock reservoir, core sample and chip sample need not be acquired in identification process, because
Make coring few without being limited due to coring cost；It is missed since anisotropism causes by force practical coring to exist with design coring
The problem of difference, samples taken caused by the representative difference of coring cannot reflect full well section reservoir pore space type really, comprehensively；With
And well number is more, the selection workload of landwaste is too big, and the distribution characteristics of reservoir pore space type in machine and transverse direction is caused to be difficult to
The problem of accurate description.This method operability is strong, at low cost, meets well logging and learns principle, through sinopec member dam Xu jiahe palpus
Three sections of calcarenaceous sandstone gas reservoir applications confirm that this method can be convenient, fast and different porosity types is recognized accurately, judges to mark
It is accurate clear, it is easy to implement, there is good adaptability to the identification of calcarenaceous sandstone reservoir pore space type, for recognizing for calcarenaceous sandstone reservoir
Know, overall merit is had laid a good foundation.
Description of the drawings
The invention will be described in more detail below based on embodiments and refering to the accompanying drawings.Wherein：
Fig. 1 is calcarenaceous sandstone reservoir pore space kind identification method flow chart of the present invention；
Fig. 2 is the experimental method flow chart that the present invention summarizes that calcium considers shale Lithology Discrimination standard to be worth doing；
Fig. 3 is the experimental method flow chart that the present invention summarizes porosity type and porosity difference correspondence；
Fig. 4 is the logging response character schematic diagram of the different lithology of 6 well of first land in the embodiment of the present invention；
Fig. 5 is the hole that the accounting that the calcarenaceous sandstone chip sample of member Ba2Jing in the embodiment of the present invention is shown is more than 50%
Type and its log response characteristics；
Fig. 6 is the hole that the accounting that the calcarenaceous sandstone chip sample of 20 well of first land in the embodiment of the present invention is shown is more than 50%
Type and its log response characteristics；
Fig. 7 is the hole that the accounting that the calcarenaceous sandstone chip sample of 20 well of first land in the embodiment of the present invention is shown is more than 50%
Type and its log response characteristics.
In the accompanying drawings, identical component uses identical reference numeral, attached drawing not to be drawn to scale.
Specific implementation mode
Below in conjunction with attached drawing, the present invention is further illustrated
Calcarenaceous sandstone development section includes calcarenaceous sandstone dried layer and development intergranular dissolution porosity, the intergranular corrosion of hole agensis
Fill hole, micropore calcarenaceous sandstone reservoir.Intergranular dissolution porosity refers to being formed due to corrosion between calcium considers particle to be worth doing
Hole, the aperture of intergranular dissolution porosity is generally between 0.03mm to 0.5mm.It refers to that intergranular is molten that intergranular corrosion, which fills hole,
Borrosion hole gap is formed by the clay mineral filled in hole, including intergranular dissolution porosity by clay mineral full-filling or part filling
Intracrystalline pore, and the remaining intergranular dissolution porosity that is not filled with of part, remaining intergranular dissolution porosity, that is, intergranular dissolution porosity glued
It is left behind the space come after native mineral portion filling and is formed by hole, such as a certain intergranular dissolution porosity is filled by clay mineral
70%, remaining 30% space is formed by the i.e. remaining intergranular dissolution porosity of hole in intergranular dissolution porosity.Aforementioned proportion
It is only exemplary statement, is not construed as limiting the invention.Micropore refers to being distributed in calcarenaceous sandstone intergranular in infecting shape
Or the corrosion micropore of intragranular, aperture is usually less than 0.03mm.This three kinds of porosity types, which substantially cover in calcarenaceous sandstone, deposits
All porosity types, even if exist in calcarenaceous sandstone it is few if other its amount of porosity type, in practical applications can be with
It ignores.
Fig. 4 A, Fig. 5 A, Fig. 6 A, Fig. 7 A logging curve in, GR (Gamma-Ray) indicate natural gamma ray logging, unit
For API.RD (Deep Resistivity) indicates that deep lateral resistivity, unit are ohm meter (Ω M).RS(Short
Resistivity) indicate that shallow lateral resistivity, unit are ohm meter (Ω M).DEN (Density) indicates density, unit
For g/cm3.CNL (compensated neutron logging) compensated neutron log, nondimensional number.AC (acoustic) sound
The wave time difference, unit are microsecond/foot (μ s/ft).Den por (density porosity) indicate density porosity, zero dimension
Amount.Ac por (acoustic porosity) indicate interval transit time porosity, nondimensional number.cnl por(compensated
Neutron logging porosity) indicate compensated neutron porosity, it is referred to as neutron porosity, zero dimension in the present invention
Amount.Den ac por (density acoustic porosity) refer to the difference that density porosity subtracts interval transit time porosity
Value, nondimensional number.The abbreviation identical with above-mentioned abbreviation that other parts are mentioned in the present invention, expressed by it is equivalent in meaning.
Fig. 4 A, Fig. 5 A, Fig. 6 A, Fig. 7 A logging curve in RD and RS be all made of logarithmic coordinates.Fig. 4 C, Fig. 5 B-- Fig. 5 E, figure
The magnification ratio of the digital representation sample shown in the lower right corner in 6B-- Fig. 6 E, Fig. 7 B, Fig. 7 C.
Fig. 1 is the method flow diagram of present invention identification calcarenaceous sandstone reservoir pore space type, as shown in Figure 1, choosing calcium considers sand to be worth doing
Rock develops the interval of interest where section, and the interval of interest is a sand group or a single sand body, is included at least in a sand group
One single sand body, it is preferred that the sand group where choosing calcarenaceous sandstone development section is purpose interval, chooses the calcium bits in interval of interest
Sandstone dried layer section, obtains the interval transit time porosity curve and density porosity curve of the affiliated well of the interval of interest, and by institute
State the interval transit time porosity curve of the affiliated well of interval of interest, the hole of density porosity curve and the affiliated well of the interval of interest
Degree calibration curve is placed on together in same log road；Using the porosity calibration curve of the affiliated well of the interval of interest as base
Standard, depth coordinate is constant, by the interval transit time porosity curve of the affiliated well of the interval of interest, close on porosity coordinate direction
Porosity curve translation is spent, density porosity curve, interval transit time porosity curve and the institute of the affiliated well of the interval of interest are made
Calcarenaceous sandstone dried layer section of the porosity calibration curve of the affiliated well of interval of interest in the interval of interest is stated to overlap；Hole is set
The accounting of type；After calcarenaceous sandstone dried layer section of three porosity curves in the interval of interest overlaps, according to same well
Log on, the density porosity of same depth position and the difference degree of interval transit time porosity at the depth location
The correspondence for meeting the porosity type for presetting accounting condition in calcarenaceous sandstone reservoir identifies the calcium of the affiliated well of the interval of interest
Consider the porosity type for meeting in sandstone reservoir and presetting accounting condition to be worth doing.This method identifies calcarenaceous sandstone using porosity logging curve
Meet the porosity type for presetting accounting condition in reservoir, core sample and chip sample need not be acquired in identification process, thus
Do not make coring few since coring cost limits；It is missed since anisotropism causes by force practical coring to exist with design coring
The problem of difference, samples taken caused by the representative difference of coring cannot reflect reservoir pore space type really, comprehensively；And landwaste
Selection workload it is too big, the problem of causing the distribution characteristics of reservoir pore space type to be in machine and transverse direction difficult to accurate description.
This method operability is strong, at low cost, meets well logging and learns principle, must three sections of calcarenaceous sandstone gas reservoirs through sinopec member dam Xu jiahe
Using confirmation, this method can be convenient, fast and different porosity types is recognized accurately, and criterion is clear, easy to implement,
There is good adaptability to the identification of calcarenaceous sandstone reservoir pore space type, is established for understanding, the overall merit of calcarenaceous sandstone reservoir
Good basis.
Preferably, section is developed using calcarenaceous sandstone Lithology Discrimination standard identification calcarenaceous sandstone, and then chooses calcarenaceous sandstone hair
Educate the interval of interest where section.For the calcarenaceous sandstone Lithology Discrimination standard by experimental summary, Fig. 2 is to summarize calcarenaceous sandstone rock
Property criterion of identification method flow diagram, Fig. 4 be first dam must in three sections of 6 wells of first dam different lithology logging response character, as Fig. 2,
Shown in Fig. 4, choose that first dam must coring be few in three sections of calcarenaceous sandstone gas reservoirs and the known calcarenaceous sandstone development section of the representative difference of coring
The landwaste packet of the interval of interest at place, therefrom acquires chip sample, after grinding makes, sample is ground together with rock core, micro-
It is observed in detail under mirror, identifies sample lithology.It preferably, can be in order to improve the accuracy of calcarenaceous sandstone Lithology Discrimination standard
Other sand groups are chosen to test together.Specifically, it is the target zone where known calcarenaceous sandstone develops section with the three sand groups of first Ba6Jing
Section, is tested together in conjunction with the two sand groups of first Ba6Jing, 6 well of first dam, two sand group, the rock core in three sand groups, chip sample is acquired, through system
Observation in detail under the microscope, identifies sample lithology after sample.According to the sample lithology identification knot of 6 well of first dam, two sand group and three sand groups
Depth where fruit and sample is demarcated the Logging Curves of member Ba6Jing and is surveyed with reading the corresponding routine of sample place depth in detail
Value on well curve, samples taken is more intensive in the depth direction, then the accuracy of calcarenaceous sandstone Lithology Discrimination standard is higher.It is right
The sensitive log of reflection lithology is analyzed, since within the scope of research area, generally lithology belongs to hypotonic fine and close reservoir rock,
Hole and fluid information respond faint on log, and resistivity value is by the ingredient of lithology and being affected for granularity, therefore,
Resistivity curve is the key that one of lithology curves such as identification calcarenaceous sandstone, according to calibration result, summarizes calcarenaceous sandstone lithology and knows
Other standard is as shown in table 1.
Table 1
Fig. 4 illustratively gives the calibration of wherein several samples, is respectively position a4 in Fig. 4 A as shown in Fig. 4 B, Fig. 4 E
With the coring sample at the sample at the d4 of position, that is, first dam 6 well 4267.2m and 4301.2m, which is conglomerate or gravel
Rock.Fig. 4 A are first 6 borehole logging tool curve graph of dam, and on the Logging Curves corresponding to shown position a4 and position d4, GR is less than
40API, RD are more than 4000 ohm meters.Sample in respectively Fig. 4 A as shown in Fig. 4 C, Fig. 4 D at position b4 and position c4,
It is exactly the coring sample at first dam 6 well 4295.2m and 4297m, which is calcarenaceous sandstone.Position b4 and position c4 shown in Fig. 4 A
On corresponding Logging Curves, GR is less than 55API, the ohm meter of 300 ohm meters≤RD≤4000.By calcarenaceous sandstone rock
Property criterion of identification be applied to 7 well of first 702 well of land, first 11 well of land and first land, the observation qualification result of acquired results and respective sample
It coincide.Section is developed using above-mentioned calcarenaceous sandstone Lithology Discrimination standard identification calcarenaceous sandstone, easy to operate, recognition accuracy is high, can
Quickly identify that calcarenaceous sandstone develops section using Logging Curves.Sand is considered to be worth doing using above-mentioned calcarenaceous sandstone Lithology Discrimination standard identification calcium
Rock development section is not construed as limiting the invention, as long as can recognize that the technological means of calcarenaceous sandstone development section in the prior art
It is applicable to the present invention, such as develops section using calcarenaceous sandstone elemental recognition method identification calcarenaceous sandstone.
Preferably, on the log of same well, the density porosity and interval transit time porosity of same depth position
Difference degree and the depth location at meet in calcarenaceous sandstone reservoir the porosity type for presetting accounting condition correspondence it is logical
Experimental summary acquisition is crossed, the experimental method flow chart for summarizing the correspondence is illustrated in figure 3.Choosing first dam must three sections of calcium bits sand
The landwaste packet of interval of interest where coring is few in rock gas reservoir and the known calcarenaceous sandstone of the representative difference of coring development section, is therefrom adopted
Collect chip sample, after grinding makes, sample is ground together with rock core, under the microscope observation in detail, chooses porosity type and meet
The sample of default accounting condition.Known interval of interest for observing porosity type and the known interval of interest for lithology identification
It can be identical interval of interest, interval of interest can also be different.In the present embodiment, for observing the known of porosity type
Interval of interest and known interval of interest for lithology identification are specifically used in the present embodiment using different intervals of interest
The known interval of interest for observing porosity type is the three sand groups of member Ba2Jing, and Fig. 5 is that porosity type meets default account in 2 well of first dam
Than the sample and its porosity logging curve response characteristic of condition.Specifically, setting porosity type accounting is more than 50%.As Fig. 3,
Shown in Fig. 5, rock core, the chip sample of 2 well of first dam, three sand group are acquired, observation in detail under the microscope, chooses hole after sample preparation
Type accounting is more than 50% sample, specifically, chooses sample of the intergranular dissolution porosity more than 50%, intergranular corrosion fills hole
Sample, micropore more than 50% are more than 50% sample.
As shown in Figure 5A, according to the well-log information of first Ba2Jing it is found that the deep direction finding resistivity of interval is inclined near the a5 of position
Height is more than 4000 ohm meters, is Conglomerate Section.As shown in figs. 3 and 5, according to the well-log information of first Ba2Jing, member Ba2Jing is chosen
Three sand groups in deep lateral resistivity ranging from 1000 ohm meters<RD<4000 ohm meters, density are more than 2.65g/cm3,
And intervals of the compensated neutron log CNL less than 5% is calcarenaceous sandstone dried layer section, which is in for depth
4371.9m--4372.2m depth segment.Confirm that the depth segment positioned at 4371.9m--4372.2m is considered to be worth doing for calcium through chip sample observation
Sandstone dried layer section, Fig. 5 B are illustratively illustrated in sample namely Fig. 5 A in calcarenaceous sandstone dried layer section positioned at 4372m depths
Sample at the b5 of position, the sample are shown as calcarenaceous sandstone dried layer, hole agensis.Read the depth of 4371.9m--4372.2m
The corresponding density value in each depth point of section and sound wave time difference value, density skeleton value and interval transit time as 2 well calcarenaceous sandstone of first dam
Skeleton value utilizes the density porosity of 2 well entire depth section of density porosity interpretation model and density skeleton value Computing Meta dam, profit
With the interval transit time hole of 2 well entire depth section of interval transit time porosity model and interval transit time skeleton value Computing Meta dam
Degree, and then obtain the density porosity curve and interval transit time porosity curve of 2 well entire depth section of first dam.By first Ba2Jing's
Density porosity curve, interval transit time porosity curve and porosity calibration curve are placed in same log road, form hole
Porosity log combines, it is preferred that porosity calibration curve is neutron porosity curve.With the neutron porosity of first Ba2Jing
On the basis of curve, depth coordinate is constant, by the density porosity curve and interval transit time of first Ba2Jing on porosity coordinate direction
Porosity curve translates, and density porosity curve, interval transit time porosity curve and the neutron porosity curve of first Ba2Jing is made to exist
The calcarenaceous sandstone dried layer section of first Ba2Jing of selection, that is, overlapped at the depth segment of 4371.9m--4372.2m, to complete
The calibration of density porosity curve and acoustic porosity curve.In above-mentioned preferred embodiment, porosity calibration curve is neutron hole
Line of writing music is not construed as limiting the invention, and those skilled in the art can also choose core porosity curve as porosity
Calibration curve.
Depth where sample and the sample using the porosity type accounting of selection more than 50% demarcates member Ba2Jing's in detail
Density porosity curve and interval transit time porosity curve in porosity logging curve after integration steps read the sample institute
The the sample acquired on the corresponding density porosity of depth and interval transit time porosity, depth direction the intensive, the result summarized
It is more accurate.Specifically, when reading intergranular dissolution porosity density porosity corresponding more than depth where 50% sample and sound wave
Poor porosity reads intergranular corrosion filling hole density porosity corresponding more than depth where 50% sample and interval transit time
Porosity reads micropore density porosity corresponding more than depth where 50% sample and interval transit time porosity, according to
It reads result and summarizes respectively and be more than with micropore more than 50% when intergranular dissolution porosity is more than 50%, intergranular corrosion filling hole
When 50% in corresponding 2 well of first dam same position density porosity and interval transit time porosity difference degree, it is preferred that it is close
The difference degree of degree porosity and interval transit time porosity refers to the difference that density porosity subtracts interval transit time porosity.Fig. 5 A
For the logging curve of first Ba2Jing, show that the part porosity type in 2 well of first dam, three sand group meets the interval of accounting condition,
Porosity type of the depth segment accounting more than 50% for being wherein located at 4372.2m-4372.5m is micropore, and Fig. 5 C are illustratively opened up
Show the sample being located in the depth segment at 4372.3m, that is, the sample in Fig. 5 A at the c5 of position, in the sample, micropore
Accounting is more than 50% and is distributed in disseminated, and the same depth location density porosity of the depth segment subtracts the difference of acoustic porosity
Maximum value is 0.48%.Porosity type positioned at the depth segment accounting of 4376.5m-4377m more than 50% fills for intergranular corrosion
Hole, Fig. 5 D illustratively illustrate the sample being located in the depth segment at 4376.5m, that is, the sample in Fig. 5 A at the d5 of position
Product, the sample are shown as intergranular corrosion filling hole accounting and are more than 50%, have a kind of kaolinite (clay pit in intergranular dissolution porosity
Object) filling, the minimum value that the same depth location density porosity of the depth segment subtracts the difference of acoustic porosity is 0.5%, most
Big value is 2.73%, and as same depth location density porosity subtracts the reduction corrosion pack hole of the difference of acoustic porosity
Quantity also accordingly reduce.Porosity type positioned at 4379.3m-4380.3m depth segment accountings more than 50% is intergranular corrosion hole
Gap, Fig. 5 E illustratively illustrate the sample being located in the depth segment at 4380m, that is, the sample in Fig. 5 A at the e5 of position
Product, the sample are shown as intergranular dissolution porosity accounting and are more than 50%, and the same depth location density porosity of the depth segment subtracts sound
The minimum value of the difference of porosity>3%, maximum value 5%.
According to porosity type accounting>The reading of depth where 50% sample corresponding density porosity and acoustic porosity
It is obtained on the log of same well as a result, summarizing, the density porosity of same depth position and interval transit time porosity
Difference degree and the correspondence that satisfaction presets the porosity type of accounting condition in calcarenaceous sandstone reservoir at the depth location are：
When the density porosity of same depth location subtracts the difference > 3% of interval transit time porosity, the depth location
Reservoir in accounting more than 50% porosity type be intergranular dissolution porosity；
When the density porosity of same depth location subtracts difference >=0.5% of interval transit time porosity, and when≤3%,
Porosity type of the accounting more than 50% is that intergranular corrosion fills hole in the reservoir of the depth location；
When the density porosity of same depth location subtracts the difference < 0.5% of interval transit time porosity, the depth position
Porosity type of the accounting more than 50% is micropore in the reservoir set.
Above-mentioned correspondence is to learn principle based on following well logging, intergranular dissolution porosity, intergranular corrosion pack hole in reservoir
Gap and micropore are secondary pore, and density porosity reflection is total porosity, and the reflection of interval transit time porosity is primary
Porosity, secondary porosity=density porosity (total porosity)-interval transit time porosity (primary porosity), with secondary pore
The size of degree determines the porosity type for the condition for meeting accounting in calcarenaceous sandstone reservoir.
On the log of calcarenaceous sandstone Lithology Discrimination standard and same well, the density hole of same depth position
Porosity and the difference degree of interval transit time porosity preset accounting condition with satisfaction in calcarenaceous sandstone reservoir at the depth location
After the correspondence of porosity type is established, result is directly applied to the identification of calcarenaceous sandstone reservoir pore space type.Such as Fig. 1, Fig. 6
Shown, wherein Fig. 6 A are the logging curve of 20 well of first land, choose GR in 20 well of first land and are less than 55API, 300 ohm meters≤RD
Three sand groups where the depth segment of≤4000 ohm meters are the target zone where calcarenaceous sandstone development section.20 well of first land, three sand group
In positioned at 4135.4m-4135.7m depth segment deep lateral resistivity ranging from 1000 ohm meters<RD<4000 ohm
Rice, density are more than 2.65g/cm3, and compensated neutron log CNL is less than 5%, therefore it is calcarenaceous sandstone dried layer section to choose the depth segment,
Interval in namely Fig. 6 A where the a6 of position.The corresponding density value in each depth point and sound wave in interval where reading position a6
Density skeleton value and interval transit time skeleton value of the time difference value as 20 well calcarenaceous sandstone of first land, and mould is explained by density porosity
The density porosity of 20 well entire depth section of type and density skeleton value Computing Meta land, by interval transit time porosity model and
The interval transit time porosity of 20 well entire depth section of interval transit time hole on framework value Computing Meta land, and then it is entirely deep to obtain 20 well of first land
The density porosity curve and interval transit time porosity curve for spending section, by the density porosity curve of 20 well of first land, interval transit time
Porosity curve is placed in porosity calibration curve in same log road, it is preferred that porosity calibration curve is middle sub-aperture
Porosity curve.On the basis of 20 well neutron porosity curve of first land, by the density porosity curve of 20 well of first land, interval transit time hole
Porosity curvilinear translation makes density porosity curve, interval transit time porosity curve and the neutron porosity curve of 20 well of first land exist
It is overlapped positioned at interval where the calcarenaceous sandstone dried layer section of 4135.4m-4135.7m, that is, position a6, to complete density porosity
The calibration of curve and acoustic porosity curve.The density porosity and acoustic porosity of first land same depth point of 20 well are read, and
The difference that density porosity subtracts acoustic porosity is calculated, porosity type accounting is set>50%, according to the same well established
Log on, the density porosity of same depth position and the difference degree of interval transit time porosity at the depth location
The correspondence for meeting the porosity type for presetting accounting condition in calcarenaceous sandstone reservoir identifies accounting>50% porosity type.Tool
Body it is as shown in Figure 6A, be located at the depth segment of 4141.5m-4142.2m, i.e. depth segment where position d6 is same in the depth segment
The corresponding density porosity in depth point subtracts the difference of interval transit time porosity between 0.95%-1.95%, at the difference
In the range of 0.5%-3%, therefore porosity type of the accounting more than 50% is that intergranular corrosion fills hole in the depth segment.It is located at
The depth segment of 4137m-4137.5m, i.e. depth segment where the b6 of position, in the depth segment, the corresponding density hole in same depth point
Porosity subtracts the difference of interval transit time porosity between 0.5%-0.85%, which is in the range of 0.5%-3%,
Therefore porosity type of the accounting more than 50% is intergranular corrosion filling hole in the depth segment, and it is same in depth segment where the b6 of position
The corresponding density porosity in depth point subtracts the difference of interval transit time porosity than same depth point in depth segment where the d6 of position
The difference that corresponding density porosity subtracts interval transit time porosity wants small, so the intergranular corrosion where the b6 of position in depth segment
The quantity for filling hole is less than the quantity of the intergranular corrosion filling hole in position d6 institutes depth segment.Positioned at 4140.1m-
The depth segment of 4141.3m, i.e. depth segment where the c6 of position, in the depth segment, the corresponding density porosity in same depth point subtracts
Go the difference of interval transit time porosity equal<0.5%, therefore porosity type of the accounting more than 50% is micropore in the depth segment.
Assessment institute will be carried out to 20 well of first land using calcarenaceous sandstone reservoir pore space kind identification method provided by the present invention
Obtained result is compared with the sample of 20 well respective depth of first land, the porosity type phase that above-mentioned evaluation result is shown with sample
Symbol, Fig. 6 B- Fig. 6 E give part contrast sample therein, and Fig. 6 B are the sample at position a6, that is, depth point 4135.5m
Product, the sample are shown as calcarenaceous sandstone dried layer, hole agensis, and Fig. 6 C are the sample at position b6, that is, depth point 4137.1m
Product, the sample are shown as intergranular corrosion filling hole accounting and are more than 50%, have a kind of kaolinite (clay pit in intergranular dissolution porosity
Object) filling.Fig. 6 D are the sample at position c6, that is, depth point 4140.25, which is shown as micropore accounting and is more than
50%.Fig. 6 E are the sample at position d6, that is, depth point 4141.8m, and it is big which is shown as intergranular corrosion filling hole
There is kaolinite filling in 50%, intergranular dissolution porosity.
7 well of first land is assessed using with the identical method and step of 20 well of first land, identifies its calcarenaceous sandstone reservoir
Porosity type.Fig. 7 A are the logging curve of 7 well of first land, as shown in Figure 7 A, are located at the depth segment of 3467.7m-3468.9m,
Depth segment namely where the a7 of position is calcarenaceous sandstone dried layer section.Positioned at the depth segment of 3462.5m-3463m, that is, position
Depth segment where b7, in the depth segment, the density porosity of same depth point subtract the difference of interval transit time porosity between
Between 0.53%-2.38%, therefore porosity type of the accounting more than 50% is that intergranular corrosion fills hole in the depth segment.It is located at
Depth segment where the depth segment of 3465.5m-3466.5m, that is, position c7, in the depth segment, the density hole of same depth point
Porosity subtracts the difference of interval transit time porosity between 1.7%-2.87%, therefore accounting is more than 50% hole in the depth segment
Gap type is that intergranular corrosion fills hole.Positioned at the depth segment of 3464.8m-3465.4m, that is, depth segment where the e7 of position,
In the depth segment, the difference that the density porosity of same depth point subtracts interval transit time porosity is more than 3%, therefore in the depth segment
Porosity type of the accounting more than 50% is intergranular dissolution porosity, equally can also judge the depth segment of 3469.4m-3470.2m,
Be exactly in depth segment where the d7 of position porosity type of the accounting more than 50% be intergranular dissolution porosity, this and 3461m- in Fig. 7 A
The test result of 3471m test sections can obtain 1,200,000 sides/day high yield industrial gas and match, and show the depth of 3461m-3471m
There is the presence of the intergranular dissolution porosity of Relatively centralized in section, that is, in the depth segment of 3461m-3471m, there are a certain depth segments
The accounting of its intergranular dissolution porosity is more than 50%.Position b7, the sample at the c7 of position is set forth in Fig. 7 B, 7C, and sample is shown
Porosity type of the accounting more than 50% is that intergranular corrosion fills hole, and kaolinite is filled in intergranular dissolution porosity.Sample is aobvious
Show that result is also consistent with evaluation result.
Above-described embodiment is the preferred embodiment of the present invention, density porosity and interval transit time porosity in the present invention
Difference degree is not limited to the difference that density porosity subtracts acoustic porosity, and those skilled in the art can also select by close
Degree porosity subtracts phase of the other values derived from the difference of acoustic porosity as density porosity and interval transit time porosity
Poor degree, for example, the absolute value or density porosity of the difference of density porosity and acoustic porosity subtract acoustic porosity
Difference inverse or density porosity and interval transit time porosity difference square, and also with sample in embodiment
Product are observed and the mode of sample calibration sums up the corresponding porosity type for meeting accounting condition and density porosity and sound wave hole
The correspondence of porosity difference degree.The invention is not limited in porosity type accountings to be more than 50%, can also be other ratios,
Such as 75%, and sum up the porosity type that accounting is more than 75% also with the mode that sample observation in embodiment and sample are demarcated
With the correspondence of density porosity and acoustic porosity difference degree.
Although by reference to preferred embodiment, invention has been described, the case where not departing from the scope of the present invention
Under, various improvement can be carried out to it and can carry out equivalent replacement to which part or all technical features.Especially,
As long as logic or structural conflict is not present, items technical characteristic mentioned in the various embodiments can combine in any way
Come.The invention is not limited in specific embodiments disclosed herein, but include all skills fallen within the scope of the appended claims
Art scheme.
Claims (10)
1. a kind of calcarenaceous sandstone reservoir pore space kind identification method, which is characterized in that include the following steps：
Choose the interval of interest where calcarenaceous sandstone development section；
Choose the calcarenaceous sandstone dried layer section in the interval of interest；
Obtain the interval transit time porosity curve and density porosity curve of the affiliated well of the interval of interest, and by the target zone
The interval transit time porosity curve of well, density porosity curve and the porosity calibration of the affiliated well of the interval of interest are bent belonging to section
Line is placed on together in same log road；
On the basis of the porosity calibration curve of the affiliated well of the interval of interest, depth coordinate is constant, in porosity coordinate direction
On by the interval transit time porosity curve of the affiliated well of the interval of interest, density porosity curvilinear translation, make the interval of interest
The density porosity curve of affiliated well, the porosity calibration curve of interval transit time porosity curve and the affiliated well of the interval of interest
Calcarenaceous sandstone dried layer section in the interval of interest overlaps；
The accounting of porosity type is set；
It is bent according to the well logging of same well after calcarenaceous sandstone dried layer section of three porosity curves in the interval of interest overlaps
On line, calcarenaceous sandstone at the density porosity of same depth position and the difference degree of interval transit time porosity and the depth location
The correspondence for meeting the porosity type for presetting accounting condition in reservoir identifies the calcarenaceous sandstone storage of the affiliated well of the interval of interest
Meet the porosity type for presetting accounting condition in layer.
2. calcarenaceous sandstone reservoir pore space kind identification method according to claim 1, which is characterized in that the porosity type
Accounting be more than 50%, on the log of the same well, the density porosity of same depth position and interval transit time hole
The difference degree of porosity and the corresponding pass for meeting the porosity type for presetting accounting condition in calcarenaceous sandstone reservoir at the depth location
System is：
When the density porosity of same depth location subtracts the difference > 3% of interval transit time porosity, the storage of the depth location
Porosity type of the accounting more than 50% is intergranular dissolution porosity in layer；
When the density porosity of same depth location subtracts difference >=0.5% of interval transit time porosity, and when≤3%, the depth
It is that intergranular corrosion fills hole to spend porosity type of the accounting more than 50% in the reservoir of position；
When the density porosity of same depth location subtracts the difference < 0.5% of interval transit time porosity, the depth location
Porosity type of the accounting more than 50% is micropore in reservoir.
3. calcarenaceous sandstone reservoir pore space kind identification method according to claim 2, which is characterized in that choose known calcium bits
The landwaste packet of interval of interest where sandstone development section, therefrom acquires chip sample, landwaste chip sample is formed after grinding, even
With core wafer sample, observation in detail, analyzes and chooses the sample that porosity type meets accounting condition under the microscope；
Choose the calcarenaceous sandstone dried layer section in the known interval of interest；
The interval transit time porosity curve and density porosity curve of the affiliated well of the known interval of interest are obtained, and by described in
Know interval transit time porosity curve, density porosity curve and the known affiliated well of interval of interest of the affiliated well of interval of interest
Porosity calibration curve is placed on together in same log road；
On the basis of the porosity calibration curve of the known affiliated well of interval of interest, depth coordinate is constant, in porosity coordinate
By the interval transit time porosity curve of the known affiliated well of interval of interest, density porosity curvilinear translation on direction, make known
The density porosity curve of the affiliated well of interval of interest, the porosity of interval transit time porosity curve and the affiliated well of known interval of interest
Calcarenaceous sandstone dried layer section of the calibration curve in the known interval of interest overlaps；
On the density porosity curve and interval transit time porosity curve for reading the affiliated well of the known interval of interest, porosity type
The corresponding interval transit time porosity of depth where meeting the sample of accounting condition and density porosity are summarized together according to result is read
On the log of a well, the density porosity of same depth position and the difference degree of interval transit time porosity and the depth
Meet the correspondence for the porosity type for presetting accounting condition at position in calcarenaceous sandstone reservoir.
4. calcarenaceous sandstone reservoir pore space kind identification method according to claim 1, which is characterized in that according to calcarenaceous sandstone
Lithology Discrimination standard choose the calcarenaceous sandstone and develop section, the Lithology Discrimination standard of the calcarenaceous sandstone is：Natural gamma is surveyed
The ranging from 40API < GR < 55API of well, while ranging from 300 ohm meters of deep lateral resistivity<RD<4000 ohm
Rice.
5. calcarenaceous sandstone reservoir pore space kind identification method according to claim 4, which is characterized in that choose known calcium bits
The landwaste packet of interval of interest where sandstone development section, therefrom acquires chip sample, landwaste chip sample is formed after grinding, even
With core wafer sample, observation in detail, identifies sample lithology under the microscope；
The corresponding value of depth where the sample of different lithology on the Logging Curves of the affiliated well of the known interval of interest is read,
And then summarize the Lithology Discrimination standard of the calcarenaceous sandstone.
6. calcarenaceous sandstone reservoir pore space kind identification method according to claim 1 or 3, which is characterized in that choose deep side
To ranging from 1000 ohm meters of resistivity<RD<4000 ohm meters, density are more than 2.65g/cm3, and compensated neutron log
Intervals of the CNL less than 5% is the calcarenaceous sandstone dried layer section.
7. calcarenaceous sandstone reservoir pore space kind identification method according to claim 1 or 3, which is characterized in that read any
The corresponding interval transit time value in each depth point of calcarenaceous sandstone dried layer section in interval of interest and density value, and by the sound wave of acquisition
The interval transit time skeleton value and density skeleton value of time difference value and density value as the calcarenaceous sandstone of the interval of interest, when using sound wave
Poor porosity model and density porosity interpretation model calculate separately the interval transit time porosity of the affiliated well of the interval of interest
And density porosity, and then obtain the interval transit time porosity curve and density porosity curve of the affiliated well of the interval of interest.
8. calcarenaceous sandstone reservoir pore space kind identification method according to claim 1 or 3, which is characterized in that the hole
Degree calibration curve is neutron porosity curve.
9. calcarenaceous sandstone reservoir pore space kind identification method according to claim 1 or 3, which is characterized in that the hole
Degree calibration curve is core porosity curve.
10. calcarenaceous sandstone reservoir pore space kind identification method according to claim 1, which is characterized in that the density hole
Porosity and the difference degree of interval transit time porosity are the difference or density hole that density porosity subtracts interval transit time porosity
The absolute value or density porosity and the absolute value of the difference of interval transit time porosity of degree and the difference of interval transit time porosity
Square of inverse or density porosity and the difference of interval transit time porosity.
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