CN104514553B - A kind of recognition methods and its application of rock-fragment sandstone layer Mesosphere - Google Patents
A kind of recognition methods and its application of rock-fragment sandstone layer Mesosphere Download PDFInfo
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- CN104514553B CN104514553B CN201310456176.3A CN201310456176A CN104514553B CN 104514553 B CN104514553 B CN 104514553B CN 201310456176 A CN201310456176 A CN 201310456176A CN 104514553 B CN104514553 B CN 104514553B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Abstract
The present invention relates to a kind of method that gas-bearing formation is recognized in greywacke reservoir.Porosity of this method based on rock-fragment sandstone and its essential mineral measures feature and experimental data with resistivity logging, rock-fragment sandstone is analyzed to well logging porosity, the influence of resistivity curve value, then for the gas-bearing formation in greywacke reservoir, gas sensitization curve is set up, the final basis of characterization for obtaining institute's research area's greywacke reservoir classification.The method that gas-bearing formation is recognized in greywacke reservoir in the present invention, according to conventional logging measuring principle, make full use of influence of the rock-fragment sandstone to log information, the influence that the main different quality to reservoir of content and composition for solving rock-fragment sandstone are caused, improves the degree of accuracy for explaining reservoir and reliability.
Description
Technical field
The invention belongs to petroleum natural gas exploration technical field, and in particular to a kind of knowledge of rock-fragment sandstone layer Mesosphere
Other method and its application.
Background technology
Rock-fragment sandstone refers to that landwaste content accounts for more than 25% sandstone, composition particle for quartz (<75%) and a small amount of feldspar,
Mica, cement is siliceous and carbonate matter, often the output in alluvial cone in the front area of mountains, intermountain basin and fluvial facies deposit, main point
It is distributed in the piedmont depression area of great upheaval.Over the years, rock-fragment sandstone is included into the explanation model of quartzy sandstone by China's well logging industry
Farmland, using quartzy sandstone as the destination object of well log interpretation, its essence is understood to be：The gas saturation of reservoir is mainly hole
The functional relation of porosity and resistivity.So explain because ignoring the mineral complexity of rock-fragment sandstone, and lack the opinion of science always
Card, and use till today.The statistics that presentation is stayed in the domestic discussion to rock-fragment sandstone and log response recognizes more.Domestic document
Also show, greywacke reservoir is of low quality, but it is difficult to differentiate between sometimes with quartzy sandstone, disturbs seeking for High-quality Reservoir
Look for, and then add the difficulty recognized to greywacke reservoir Mesosphere.
The difficulty of identification greywacke reservoir Mesosphere property is mainly manifested in three aspects.Is landwaste sand on one side
The skeleton of rock reservoir determines difficult.Rock-fragment sandstone is mainly included into the explanation category of quartzy sandstone by log interpretation technology at present, with list
Mineral matrix parameter participates in lithology and porosity evaluation, as shown in table 1.Exemplified by studying area by big ox, core analysis shows, greatly
Ox area rock-fragment sandstone main landwaste include schist, Hui Yunyan, phyllite, tufa stone, middle acid effusive rock, Hua Gang
Rock, slate and the wonderful rock of powder etc..As shown in table 2, mineral experimental data, which discloses rock-fragment sandstone, has complicated skeleton value.Wherein,
Using identical measuring method（Such as neutron well logging）The different landwaste mineral of measurement, can obtain differing several times even ten several times
Skeleton measures difference.It can be seen that only the experiment skeleton of application quartzy sandstone explains rock-fragment sandstone, it is more likely that cause real with production
The larger result of log interpretation of border contrast ratio.
The well log interpretation skeleton of the rock-fragment sandstone of table 1
| Mineral | Composition | Neutron skeleton (%) | Density skeleton（g/cm3） | Sound wave skeleton（μs/ft） |
| Quartzy sandstone | Quartz | -4 | 2.65 | 55.5 |
The experiment skeleton numerical value of the rock-fragment sandstone of table 2
Second aspect is to ask the porosity of quasi- greywacke reservoir difficult, and then asks the gas saturation of quasi- reservoir difficult.Fig. 1
Neutron porosity and core analysis porosity cross plot, the figure neutron porosity and core analysis for Indonesia's area's quartzy sandstone
Porosity has preferable correlation；Fig. 2 is the neutron porosity and core analysis porosity cross plot, the figure of DaNiuDi gas field
Neutron porosity and core analysis porosity relation are very poor, the totally different logging response character of substantially visible 2 class：A part of landwaste sand
The neutron porosity of rock has similar close uniformity with the porosity of core analysis；The middle sub-aperture of another part rock-fragment sandstone
Porosity is then several times as much as the porosity of core analysis.Caused by this response is probably the difference of landwaste mineralogical composition, wherein relatively more
Core analysis be low-porosity, neutron porosity can but reach 20% or so.Porosimeter, which is not calculated accurately, to be caused with Archie formula
Based on water saturation calculate inaccurate.The porosity that low-productivity layer is calculated sometimes is higher, and well log interpretation achievement is surveyed with production
Test result comes in and goes out big.
3rd aspect is to improve well log interpretation and production, the coincidence rate hardly possible of test result.DaNiuDi gas field well log interpretation
A large amount of contradictory relations with production, test show that rock-fragment sandstone content height is the main cause for causing this contradictory relation, such as
Frequently occurring for " high porosity dried layer ", is exactly the typical performance of this contradiction as shown in Figure 3 and Figure 4.2523-2530 in Fig. 3
Rice explains that porosity is more than 8%, and gas saturation is more than 50%, and gas testing is gassiness dried layer；2704-2713 meters and 2719- in Fig. 4
2725 meters are closed examination, explain that porosity is more than 10%, gas saturation is more than 50%, and gas testing is dried layer.It can be seen by Fig. 5 and Fig. 6
Go out, the gas-bearing formation of DaNiuDi gas field well log interpretation turns out to be low-productivity layer or dried layer more than 1/4 by production test.High-quality production capacity is found,
Improve well log interpretation and the coincidence rate of production, test result turns into well logging and the active demand of geological research.
As can be seen here, the problem of presently, there are is to need to research and develop one kind for recognizing greywacke reservoir Mesosphere
The method of matter, this method is easy, quick, can accurately determine the skeleton of greywacke reservoir, ask the hole of quasi- greywacke reservoir
Porosity, it is possible to improve well log interpretation and production, the coincidence rate of test result, and then can distinguish whether reservoir has gassiness and have
Standby production capacity.
The content of the invention
The technical problems to be solved by the invention are that there is provided in a kind of rock-fragment sandstone layer for above-mentioned the deficiencies in the prior art
The recognition methods of gas-bearing formation.This method makes full use of influence of the rock-fragment sandstone to log information, using " well logging information reconstruct "
Thinking, prominent gassiness information cuts down useless or duplicate message, by finding the gas sensitization factor, sets up gas sensitization curve,
The production capacity situation for directly distinguishing reservoir is reached, differentiation time, the purpose of Fast Evaluation rock-fragment sandstone gas-bearing formation is greatly shortened.
Therefore, the invention provides a kind of recognition methods of rock-fragment sandstone layer Mesosphere, including：
Step A, chooses the interval transit time and compensated neutron curve of gas-bearing bed；
Step B, chooses interval transit time and compensated neutron value, and set up gas sensitization curve；
Step C, the borehole environment of gas sensitization curve is analyzed according to CAL, is selected without expanding gas sensitization curve
Well section；
Step D, gas sensitization curve and the test of actual production well section are made according to the test result of actual production well section
As a result the correlation fluid identification plate between；
Step E, research area's fluid identification standard and gas-bearing formation basis of characterization are set up according to correlation fluid identification plate.
According to the present invention, in stepb, the interval transit time based on gas-bearing bed in step A chooses nothing with compensated neutron curve
The interval transit time of expanding well section and compensated neutron value, gas sensitization curve is set up with formula I：
ACNL=AC/CNL formulas I
Wherein, ACNL is the gas sensitization factor；
AC is interval transit time；
CNL is compensated neutron.
According to the present invention, in step B or C, it is determined that the standard without expanding well section is：By calliper log curve values and drill bit
Diameter is compared, without expanding if calliper log value is consistent with bit diameter, if calliper log value and bit diameter are not
It is consistent then have expanding.
According to the present invention, in step C, log is by testing same research area gas-bearing formation with gas sensitization curve
As a result the association analyzed and set up.
In the present invention, the interval transit time of gas-bearing bed in research area is chosen according to the change of interval transit time and compensated neutron value
With compensated neutron curve.For example, uncertain Reservoir Section whether gassiness when, can choose with sound wave jump or interval transit time increase
The interval transit time and compensated neutron curve of the common feature such as big；When it is determined that there is gas-bearing bed in research area, then tool can be chosen
There are the interval transit time and compensated neutron curve of the common features such as interval transit time increases and compensated neutron reduces.
In an embodiment of the invention, in step, choosing in research area, there is interval transit time to increase and mend
Repay the interval transit time and compensated neutron curve of the general character of neutron reduction.Because research area tests gas-bearing formation there is interval transit time to increase,
The general character that compensated neutron reduces, it is possible to recognize gas pay using this method.
According to the present invention, in step E, fixed gas-bearing formation is demarcated on plate according to oil testing result, according to
Calibration result, it is determined that fluid identification standard and gas-bearing formation basis of characterization in research area.
According to the present invention, the method for the demarcation is to determine reservoir open-flow capacity size and its economic valency using oil testing result
Relation between value.
In an embodiment of the invention, the fluid identification standard in the research area is：
When 14<ACNL<It is the higher gas-bearing formation for having economic value of production capacity when 29；
It is dried layer as ACNL≤14；
It is the relatively low gas-bearing bed of economic value as ACNL >=29.
In yet another embodiment of the present invention, the gas-bearing formation basis of characterization in the research area is：The gas sensitization factor
It is gas-bearing formation higher than baseline value.
In one embodiment, the baseline value is 14.
Present invention also offers a kind of application of above-mentioned recognition methods in the gas-bearing formation identification of rock-fragment sandstone layer.
Heretofore described term " gas-bearing formation " refers to：Under existing oil testing tech and technical conditions, with industrial value
Pure gas-bearing formation or condensate person, and it is aqueous<5%.
Heretofore described term " gas-bearing bed " refers to：Under existing oil testing tech and technical conditions, daily output tolerance is in work
Under industry standard, person on dried layer.
Heretofore described term " dried layer " refers to：Under existing oil testing tech and technical conditions, no gas production or aerogenesis
Amount is extremely low, or does not reach the layer of industrial gas standard after fracturing reform still.
Heretofore described term " coal seam " refers to：The stratiform coal body of preservation in sedimentary rocks.
Heretofore described term " calliper log curve values " refers to：The actual borehole diameter measured using caliper logging tool
Value.
Heretofore described term " oil testing result " refers to whether gassiness and its production capacity situation are measured and obtained to reservoir
Result.
Heretofore described term " test result of actual production well section " refers to the ground layer depth determined according to testing scheme
Spend after section perforation or pressure break, obtained result is measured to production capacity situation.
The recognition methods of the rock-fragment sandstone layer Mesosphere of the present invention makes full use of landwaste sand according to conventional logging measuring principle
Influence of the rock to log information, mainly solving the content and composition difference of rock-fragment sandstone can cause very to the quality of reservoir
Big influence, and then the problem of the degree of accuracy and the reliability of influence well log interpretation reservoir.Particularly, the inventive method is based on landwaste
The porosity of sandstone and its essential mineral measures feature and experimental data with resistivity logging, and analysis rock-fragment sandstone is to well logging hole
Degree, the influence of resistivity curve value, then for the gas-bearing formation in greywacke reservoir, by finding the gas sensitization factor, set up
Gas sensitization curve, it is final to obtain institute's research area's greywacke reservoir Classification and Identification standard and gas-bearing formation basis of characterization.
The gas-bearing formation recognition methods based on greywacke reservoir that the present invention is provided is easy to implement, workable, and identification is straight
See, it is clear, the degree of accuracy of gas-bearing formation fluid identification can be greatly improved cost-effective while using this method.The gas sensitization
Curve only have production capacity qualitative recognition function and evaluate reservoir whether gassiness, moreover it is possible to effectively evaluate reservoir gas-bearing economy
Property, and with the good result for instructing well to shake binding；And gassiness indicative curve can only evaluate reservoir whether gassiness.According to
Practical application effect shows that heretofore described method has the advantage of three aspects.（1）Go coal advantage.Completely eliminate coal seam
Influence to RESERVOIR RECOGNITION, makes the curve newly calculated instruct earthquake, follow the trail of reservoir advantageously；（2）Layering advantage.Newly calculate
Curve can eliminate the interference of coal, limestone and mud stone to RESERVOIR RECOGNITION, distinguish reservoir and country rock is apparent；（3）Evaluation advantage.New meter
The curve of calculation is comparable clearly to distinguish dried layer and payzone, and prediction gas pay is more accurate.Using this curve to multiple gas testings
Reservoir is counted, and interpretation coincidence rate reaches 80%.
Brief description of the drawings
Hereinafter will be based on accompanying drawing come the present invention will be described in further detail：
Fig. 1 is area of Indonesia porosity cross plot；The implication of reference is as follows in figure：CNL compensated neutrons.
Fig. 2 is DaNiuDi gas field porosity cross plot；The implication of reference is as follows in figure：CNL compensated neutrons；H1、H3、
S1, S2 different substratums.
Fig. 3 is D56 borehole logging tool curve maps.
Fig. 4 is D5 borehole logging tool curve maps.
Fig. 5 is measured data of the big ox ground in reservoir production test result.
Fig. 6 is scaled data of the big ox ground in reservoir production test result.
Fig. 7 is the flow chart of the gas-bearing formation recognition methods of greywacke reservoir of the present invention.
Fig. 8 is D68 well dried layer production capacity qualitative recognition curve maps.
Fig. 9 is D47-32 gas well gas layer production capacity qualitative recognition curve map.
Embodiment
The present invention is described in detail below in conjunction with embodiment and accompanying drawing, and these embodiments and accompanying drawing only play illustrative work
With, it is not limited to application of the invention.
Embodiment
Embodiment 1:
Fig. 7 is the flow chart of the gas-bearing formation recognition methods of greywacke reservoir of the present invention.Come below as the flow shown in Fig. 7
The recognition methods of rock-fragment sandstone layer Mesosphere is set up, and recognizes using this method the gas-bearing formation of greywacke reservoir.
（1）Choose the interval transit time and compensated neutron curve of gas-bearing bed
In the interval transit time and compensation of choosing the general character for having that interval transit time increases and compensated neutron reduces in research area
Sub- curve.
（2）Interval transit time and compensated neutron value are chosen, and sets up gas sensitization curve
Interval transit time based on gas-bearing bed in step A chooses interval transit time and benefit without expanding well section with compensated neutron curve
Middle subvalue is repaid, gas sensitization curve is set up with formula I：
ACNL=AC/CNL formulas I
Wherein, ACNL is the gas sensitization factor；
AC is interval transit time；
CNL is compensated neutron.
It is determined that the standard without expanding well section is：Calliper log curve values and bit diameter are compared, if hole diameter is surveyed
Well value is consistent with bit diameter then without expanding, has expanding if calliper log value and bit diameter are inconsistent.
（3）The borehole environment of gas sensitization curve is analyzed according to CAL, is selected without expanding gas sensitization curve well
Section.
It is determined that standard without expanding well section with（2）It is identical.
（4）Gas sensitization curve and the test result of actual production well section are made according to the test result of actual production well section
Between correlation fluid identification plate.
（5）Research area's fluid identification standard and gas-bearing formation basis of characterization are set up according to fluid identification plate
Fixed gas-bearing formation is demarcated on plate according to oil testing result, according to calibration result, it is determined that in research area
Fluid identification standard and gas-bearing formation basis of characterization.
The method of the demarcation is that the relation between reservoir open-flow capacity size and its economic value is determined using gas testing.
Fluid identification standard in the research area is：
When 14<ACNL<It is the higher gas-bearing formation for having economic value of production capacity when 29；
It is dried layer as ACNL≤14；
It is the relatively low gas-bearing bed of economic value as ACNL >=29.
Gas-bearing formation basis of characterization in the research area is：The gas sensitization factor is gas-bearing formation higher than baseline value.
Solid black lines in Fig. 8 and Fig. 9 in the column of the right side graph rightmost side one are the gas sensitization that this present invention is set up
Curve example.
As can be seen from Figure 8, that numerical value is shown as on this gas sensitization curve is low flat for dried layer（Generally less than 14%, also
I.e. baseline value is 14%）, showing reservoir, gassiness or gassiness abundance ratio be not relatively low；And Fig. 9 Mesospheres are on this gas sensitization curve
Show as numerical value high（Generally higher than baseline value 14%）And toothization is substantially, gassiness abundance in the distribution of this and clastic rock layering, longitudinal direction
It is uneven relevant.It can be seen that well log interpretation conclusion matches with production test conclusion, using this curve to multiple
Gas testing reservoir is counted, and interpretation coincidence rate reaches more than 80%, shows that this gas sensitization curve has practicality and reliability.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (7)
1. a kind of recognition methods of rock-fragment sandstone layer Mesosphere, including：
Step A, chooses the interval transit time and compensated neutron curve of gas-bearing bed；
Step B, chooses interval transit time and compensated neutron value, and set up gas sensitization curve；
Step C, the borehole environment of gas sensitization curve is analyzed according to CAL, selects the gas sensitization without expanding well section bent
Line；
Step D, gas sensitization curve and the test result of actual production well section are made according to the test result of actual production well section
Between correlation fluid identification plate；
Step E, research area's fluid identification standard and gas-bearing formation basis of characterization are set up according to fluid identification plate；
In stepb, when the interval transit time based on gas-bearing bed in step A chooses the sound wave without expanding well section with compensated neutron curve
Difference and compensated neutron value, gas sensitization curve is set up with formula I：
ACNL=AC/CNL I
Wherein, ACNL is the gas sensitization factor；
AC is interval transit time；
CNL is compensated neutron；
Fluid identification standard in the research area is：
When 14<ACNL<It is the higher gas-bearing formation for having economic value of production capacity when 29；
It is dried layer as ACNL≤14；
It is the relatively low gas-bearing bed of economic value as ACNL >=29.
2. recognition methods according to claim 1, it is characterised in that in step B or C, it is determined that the mark without expanding well section
Standard is：Calliper log curve values and bit diameter are compared, without expanding if calliper log value is consistent with bit diameter,
Have expanding if calliper log value and bit diameter are inconsistent.
3. recognition methods according to claim 1 or 2, it is characterised in that in step, choosing in research area has sound
The interval transit time for the general character that the ripple time difference increases and compensated neutron reduces and compensated neutron curve.
4. recognition methods according to claim 1, it is characterised in that in step E, according to oil testing result on plate it is right
Fixed gas-bearing formation is demarcated, according to calibration result, it is determined that fluid identification standard and gas-bearing formation basis of characterization in research area.
5. recognition methods according to claim 4, it is characterised in that the method for the demarcation is determined using oil testing result
Relation between reservoir open-flow capacity size and its economic value.
6. the recognition methods according to claim 4 or 5, it is characterised in that the gas-bearing formation basis of characterization in the research area is：
The gas sensitization factor is gas-bearing formation higher than baseline value.
7. recognition methods according to claim 6, it is characterised in that the baseline value is 14.
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| CN105134193A (en) * | 2015-08-31 | 2015-12-09 | 中国华能集团清洁能源技术研究院有限公司 | Method for rapidly selecting shale oil-gas growth layer section |
| CN111594155B (en) * | 2019-02-21 | 2022-08-19 | 中国石油化工股份有限公司 | Method for identifying gas layer and water layer of compact complex lithologic reservoir |
| CN112012726B (en) * | 2019-05-30 | 2023-12-12 | 中石化石油工程技术服务有限公司 | Lithology recognition method |
| CN111764895B (en) * | 2020-08-12 | 2023-01-31 | 重庆地质矿产研究院 | Logging evaluation method suitable for shale gas reservoir geological model |
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