CN107861152A - A kind of Mesozoic Strata fine correlation method - Google Patents
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Abstract
The present invention relates to a kind of Mesozoic Strata fine correlation method, is related to the technical field of oil exploration comprehensive geology evaluation, the described method comprises the following steps：(1) Mesozoic group inside story Strata Comparison：The clear and definite correlation marker of individual well log, lithology and mineral feature, establish the stratotype for being available for the whole district to contrast；(2) earthquake fine structural interpretation：Well shake demarcation, is established and explains screen work, and the research of Mesozoic group residual stratum spread is carried out for mark according to unconformity contact relation, reflection wave groups feature, particular lithologic body etc.；(3) inside story fine correlation of horizons is explained：The clear and definite J of inside story formation rock electrical characteristics difference3+K1、J1+2 On、J1+2 UnderBetween boundary, disclose J3+K1Igneous rock, tuffaceous sandstone, J1+2The class reservoir of conventional sandstone three.Mesozoic Strata fine correlation method of the present invention is fine correlation of horizons, implement Main Reservoirs distribution and residual stratum spread provides reliable basis, the shortcomings that overcoming the single contrast by well log curve.
Description
Technical field
The present invention relates to the technical field of oil exploration comprehensive geology evaluation, it is more particularly related in one kind
Raw boundary's fine correlation of horizons method.
Background technology
The Mesozoic group is the important target zone of Dagang prospecting area pre Tertiary, is that pre Tertiary finds the most oil-yielding stratum of oil reservoir
System.The weathering shop that has now been found that, Wang Guantun, house female temple Mesozoic group reservoir buried depth is shallow, yield is high, is to find high-quality and efficient reserves
Major fields.But because Mesozoic group inside story stratigraphic horizon belongs to difficulty, cause Mesozoic group different generations residual stratum and storage
Layer spread is unclear, so as to influence hydrocarbon exploration potential evaluation.The main reason for causing Mesozoic Strata layer position ownership difficult has：In
Raw boundary's formation thickness is big, and complex lithology, characteristic feature changes greatly；More phase tectonic movements cause strata denudation, breakthrough serious；Fossil
Sample is few.In recent years, each elephant of China has preferable discovery more for burial, explores out certain reserves successively.
Dagang Oilfield exploration has also been found, but does not do holistic approach for the Mesozoic group, and Stratigraphic Attribution lacks with inside story Strata Comparison unites
One property, need the method to form Mesozoic group inside story Strata Comparison badly, and establish the stratotype for being available for Dagang prospecting area to contrast.
Mesozoic group construction is complicated, stratigraphical break, degrades serious, Seismic reflection sequences poor continuity, longitudinal inside story stratum stroke
It is point larger with across comparison tracking difficulty, directly govern the deep expansion that Mesozoic group goals research works.Back wave geology is anticipated
Justice is directly connected to the essence that subsequent evaluation maps out the work from the contrast layering of individual well geology, the fine degree of well interpretation division
Parasexuality.Therefore, Mesozoic Strata boundary and inside story stratum boundary limit need to select the contrast division that emphasis well carries out earth-layer fine, with reference to
More well individual well geological information Comprehensive Correlations, look for Strata Comparison mark, are badly in need of a kind of Mesozoic Strata fine correlation method.
The content of the invention
In order to solve above-mentioned technical problem of the prior art, it is an object of the invention to provide a kind of Mesozoic Strata essence
Thin control methods.
In order to solve to invent described technical problem and realize goal of the invention, present invention employs following technical scheme：
Mesozoic Strata fine correlation method of the present invention, it is characterised in that comprise the following steps：
(1) STRATIGRAPHIC DIVISION：Based on well log curve, fine correlation division stratum；
(2) well contrast is joined：Contrasted by step (1) for well connection well across comparison and longitudinal direction, specify regional correlation mark, build
The stratotype that vertical Kongnan Area can contrast；
(3) well shake Fine calibration：The stratotype established from step (2), by well shake demarcation by geology to bit
Sign is established with seismic trace near well ripple group reflectance signature and contacted, and specifies earthquake reflection line-ups geological Significance；
(4) seismic fine interpretation：Carry out earthquake laterally to follow the trail of, carry out fine structural interpretation, specify Mesozoic group inside story layer J3+
K1Boundary, J1+2 OnBoundary, J1+2 UnderBoundary；
(5) residual stratum spread in the Mesozoic group is studied：With reference to step (4) clearly inside story stratum boundary limit, Mesozoic group remnants are implemented
Stratum, look for Favorable Reservoir.
The J3+K1Upper sieve dwarf and lower chalk generation, the J in meaning1+2 OnLower sieve's dwarf epimere, the J in meaning1+2 UnderMean
In lower sieve's dwarf hypomere.
Wherein, the well log curve described in step (1) includes 2.5m resistivity curves and interval transit time curve.
Wherein, in step (1), using 2.5m bottom gradient electrode system logging methods of logging well, as logger above carries,
The take-off at once of formation lithology boundary change point is run into, amplitude corresponds to formation lithology boundary, with reference to the height of interval transit time value, essence
Thin division stratigraphic boundary.
Wherein, in step (2), the correlation marker be with quartz content in rock salt sample, calcareous, sillar composition and
Diagenetic is correlation marker.
Wherein, in step (3), clear and definite stratum geological information shakes Fine calibration and earthquake reflected wave lineups by well
Opening relationships, assign seismic event geological Significance.
Wherein, J3+K1Develop igneous rock, J in top1+2 OnWhen boundary develops relatively stable low GR, high resistivity, praetersonic
The block sandstone feature of difference, J1+2 UnderBoundary is mainly the sandstone of high resistivity amplitude.
Specifically, Mesozoic Strata fine correlation method of the invention, comprises the following steps：
(1) STRATIGRAPHIC DIVISION：2.5m resistivity curves combination interval transit time curve comprehensive division Mesozoic group bottom and top beds and interior
Curtain stratigraphic boundary；
(2) well contrast is joined：With reference to how salty well STRATIGRAPHIC DIVISION information, carry out connection well across comparison and longitudinal direction contrasts, really
Determine the big stratum boundary limit in the Mesozoic group, introduce lithology and mineral feature and establish correlation marker, with reference to step (1) comprehensive division inside story stratigraphic boundary.
(3) well shake Fine calibration：Contact is established by fine well shake demarcation, assigns reflection line-ups actual geology
Meaning, by Seismic reflection sequences feature and unconformity feature, establish the canonical profile that can laterally contrast.
(4) seismic fine interpretation：Constrained by step (3) by canonical profile, establish the whole district and explain screen work, with carrying out earthquake
Matter layer position is laterally followed the trail of, and is carried out fine structural interpretation, is successively refined, and identifies Mesozoic group inside story layer and special geobody spread.
(5) residual stratum spread in the Mesozoic group is studied：On the basis of the fine STRATIGRAPHIC DIVISION of step (4) and integrated interpretation, knot
Rock electrical feature, paleontological characteristics, Mesozoic Strata unconformity contact relation and the evaluation of reflection wave groups characteristic synthetic are closed, in implementing
Raw boundary's residual stratum spread and thickness characteristics, look for favourable storage.
Compared with immediate prior art, a kind of Mesozoic Strata fine correlation method of the present invention has following
Beneficial effect：
Survey mud logging technique, particularly 2.5m bottom gradient electrode systems are fully utilized in the fine correlation method of the present invention
Features of logging curve, the take-off of lithology boundary change point is corresponded to amplitude high point and carries out fine STRATIGRAPHIC DIVISION, avoids other classifications
Resistivity half range point corresponds to the inaccuracy that lithology boundary change point carries out STRATIGRAPHIC DIVISION, and combines interval transit time, lithology and mineral feature
Overall merit is carried out Deng multi-class data, and using seismic response features and features described above, improves the accuracy of STRATIGRAPHIC DIVISION, it is right
There is preferable application in determining Mesozoic Strata attaching problem and bottom and top beds, the limit Seismology and Geology across comparison tracking of inside story stratum boundary
Effect.Tested and applied in X areas using a kind of Mesozoic Strata fine correlation method of the present invention, compared to its other party
Method, more fine stratum can be effectively divided, theory combines and actually achieves preferable effect.
Brief description of the drawings
Fig. 1 is the Mesozoic group composite columnar section in example 1.
Fig. 2 is that the g177 in example 1 represents well Mesozoic group inside story Stratigraphic Attribution analysis chart.
Fig. 3 is Mesozoic group inside story formation rock electricity and Diagenetic analysis chart in example 1.
Fig. 4 is that the emphasis well in example 1 joins well comparison diagram.
Fig. 5 is the inside story fine correlation of horizons figure in example 1.
Fig. 6 is that the g17102 in example 1 represents Jing Jing shake demarcation.
Fig. 7 is the seismic interpretation representative profile in example 1.
Embodiment
A kind of Mesozoic Strata fine correlation method of the present invention is done further below with reference to specific embodiment
Elaboration, to make more complete and clear explanation to technical scheme.
The Forecasting Methodology of Volcanic Lithofacies of the present invention, comprises the following steps：
(1) STRATIGRAPHIC DIVISION：The characteristics of 2.5m resistivity curve amplitude high points correspond to formation lithology boundary, overcome other electricity
The defects of resistance rate well logging half range point corresponds to lithology boundary line delimitation stratum, it is comprehensive with reference to more curves such as interval transit time, natural gamma, density
Close division Mesozoic group bottom and top beds and inside story stratigraphic boundary；
(2) well contrast is joined：With reference to how salty well STRATIGRAPHIC DIVISION information, development connection well is horizontal, longitudinal direction contrast, logical in transverse direction
Cross well log curve variation characteristic, base value feature etc. and determine the big stratum boundary limit in the Mesozoic group, introduce lithology and mineral feature, paleontological characteristics, diagenesis
Action character establishes correlation marker, the Electrical Property Correlation mark obtained with reference to step (1), comprehensive division inside story stratum boundary limit.
(3) well shake Fine calibration：Emphasis well geological information is established by fine well shake demarcation obtained by step (1), (2)
Contact, assign reflection line-ups actual geological Significance, by Seismic reflection sequences feature and unconformity feature, establish laterally
The canonical profile that can be contrasted.
(4) seismic fine interpretation：Constrained by step (3) by canonical profile, establish the whole district and explain screen work, with carrying out earthquake
Matter layer position is laterally followed the trail of, and is carried out fine structural interpretation, is successively refined, and identifies Mesozoic group inside story layer and special geobody spread.
(5) residual stratum spread in the Mesozoic group is studied：On the basis of the fine STRATIGRAPHIC DIVISION of step (4) and integrated interpretation, knot
It is comprehensive to close rock electrical feature, paleontological characteristics, Mesozoic Strata unconformity contact relation, reflection wave groups feature, particular lithologic body etc.
Evaluation, implements Mesozoic group residual stratum spread and thickness characteristics, looks for favo(u)rable target
It is example below, the present invention is by the actual seismic geologic information combined in specific X areas to of the present invention one
Kind Mesozoic Strata fine correlation method is further elaborated, to help invention structure of the those skilled in the art to the present invention
Think, technical scheme has more complete, accurate and deep understanding.Need herein clearly, although embodiment 1 is only with the ground in X areas
Shake geologic information is analyzed, but a kind of Mesozoic Strata fine correlation method of the present invention can equally be well applied to other areas not
With the fine correlation Research on partition of series of strata, and there is prediction effect substantially the same manner as Example 1.
Embodiment 1
As shown in Figure 1, first according to this area's composite columnar section data, this area's rock electrical feature is analyzed, on three sections of hole
Overlay on Mesozoic Strata, hole more than three sections based on aubergine mudstone, from the point of view of emphasis well individual well feature, Ek3Stratum is in 2.5m
Low base value is presented in resistivity curve feature, jagged equity curve form, is the identification mark that boundary is pushed up in the Mesozoic group for stable mud stone feature
Will；And Mesozoic group J3+K1Top lithology is divided into three classes：Development igneous rock at the top of the first kind, resistivity present amplitude, bell and
Flute profile tracing pattern, interval transit time height relation difference is big, according to igneous rock compactness extent, crack dissolution pore development degree, containing stream
Depending on volume property, density is generally higher than conventional sand shale density value；Phase is presented in development tuffaceous sandstone at the top of second class, resistivity
To amplitude, amplitude is less than igneous rock, and finger-like, spininess feature is presented in tracing pattern, and the relatively low saw of amplitude is presented in indivedual well sections
Dentation, density are more than sand shale, and interval transit time change is little；3rd class is conventional sandstone class, and base value is relatively low, resistivity amplitude compared with
Low, box-shaped, approximate box-shaped is presented, based on bell in curve more, and the average value stabilization of interval transit time is 260 or so, and density value is in 2.3-
Between 2.5, J1+2 OnThe characteristics of low amplitude value, nearly base value is presented in boundary generally resistivity, is presented indented features, accidental block sand
Rock, box-shaped or approximate box-shaped feature is presented, gamma value is generally higher, and density is conventional sand shale density value, interval transit time and neighbour
There is significant change in surface layer base value, and average value is in 250 or so, J1+2 UnderThere is obvious lifting in boundary generally resistivity base value,
Bell, finger-like amplitude is presented, sandstone deposition is more universal, and the obvious positive rhythm cycle of sedimentation, interval transit time are presented from bottom to top
It is worth average out to 220 or so；Triassic Stratigraphic resistivity curve underlie close to base value, is spiculation form, natural potential is almost
Non Apparent Abnormality, poor permeability, density is more straight with interval transit time, stable mud stone sedimentary characteristic is presented, with JUnder 1+2Boundary
There is obvious rock Electrical change；And entering Permian System, a plurality of curve base value change is obvious, and amplitude, sound wave occurs in resistivity
The time difference becomes big, and density diminishes suddenly, is good correlation marker (Fig. 1)；For Stratigraphic Attribution problem, enter one by rock electrical characteristics
Step is determined, and from the point of view of g177 well electrical measurement features, original is recognized using the emergent high gamma section of low gamma mud stone and bottom as mark,
Stratum is divided, from the point of view of sedimentary rhythm and Resistivity Characteristics, it is believed that the stratigraphic boundary of original understanding division is simultaneously unreasonable, now passes through this
Method is using resistivity as main partitioning standards, with reference to base value change and gamma, spontaneous potential anomaly, comprehensive division, with low gamma
Mud stone section belongs to and J1+2 OnStratum is more reasonable, meets deposition positive rhythm feature (Fig. 2).
Second, comprehensive emphasis well geologic information is evaluated, and except above-mentioned resistivity, interval transit time etc., electrically curve is special
Sign is outer, combines lithology and mineral feature analysis, palaeontological analysis and diagenesis feature, and joint Strata Comparison divides, by summarizing, J3
+K1Quartz content is distributed in 13-20% more, is overlying hole shop group quartz content 35-40% half, and calcareous content is low, only
For 1-2%, from the point of view of sillar composition, top igneous rock develops its sillar content up to 40-70%, and top is that sedimentary rock is sillar
Content is only 1-2%, and in terms of diagenesis, hole is mostly based on secondary intergranular pore, accounts for 18%, component endoporus, stamp hole have more
Distribution, intergranular are point, point-line, linear contact lay；J1+2 OnBoundary stratum lithology and mineral feature, quartz content slightly raise, and are 23-28%, calcium
Matter content has risen, and is 2-5%, and sillar composition is 12-17% if igneous rock is developed, sedimentary rock 2-5%, diagenesis
The secondary intergranular pores of Kong Xiwei, component dissolution pore, the stamp hole dissolution pore of formation；Particle is local for concavo-convex contact with point-line, linear contact lay；
J1+2Lower Limits stratum lithology and mineral feature quartz content is 33-37%, and calcareous content is higher, more than 10%, rock and mineral component igneous rock
12-17%, sedimentary rock 4-9%, it is secondary intergranular pore, stamp hole dissolution pore that diagenesis, which forms the western type in hole,；Interparticle contact
Relation is based on lenticular；In addition, from the point of view of sandstone constituent maturity, from bottom to top, J1+2 Under-J1+2 On-J3+K1By height to
Low (Fig. 3).Evaluated by individual well comprehensive geology, establish emphasis well connection well Strata Comparison section, three sections of Mesozoic group top and hole are not
Contact is integrated, three sections of the hole aubergine mudstone whole district is stable to develop, and the low base value of resistivity, underlie Mesozoic group igneous rock, tuffaceous sand
Rock is more developed, and high base value, amplitude is presented in resistivity, can laterally contrast, and more wells, which do not bore, meets Mesozoic group bottom boundary；Inside story is entered
One step across comparison divides, and determines inside story stratigraphic boundary (Fig. 4), is divided for fine correlation, is contacted by unconformity, lithology becomes
Change, electrical property feature etc. further divide favourable lithologic body transverse direction Distribution Characteristics, such as J3+K1Volcanic rock body, J1+2 OnBlock sandstone,
J1+2 UnderThe Favorable Reservoirs such as sandstone (Fig. 5).
Finally, be available for the stratotype achievement that the whole district can contrast according to obtained by above-mentioned analysis, by geological information with
Seismic data is associated, by artificial synthesized E-selectin, fine well shake demarcation (Fig. 6), and by taking the demarcation of g17102 wells as an example, J3
+K1Push up boundary and the strong amplitude continuous reflection feature of medium-high frequency, J are reflected into by demarcation, seismic trace near well1+2 OnSeismic trace near well is low frequency
In the more continuous reflectance signature of weak amplitude, J1+2 UnderFor the medium continuous reflection feature of the stronger amplitude of high frequency, ripple group specify that
The even geological meaning of reflection line-ups, establishes the seismic interpretation screen work of the whole district, and carries out horizontal tracking, and seismic data is in itself
With preferable lateral resolution, shaken and demarcated by well, with reference to stratigraphic structure change, unconformity contact, ripple group reflectance signature and
Lineups reflection power and bad break feature, are implemented Mesozoic Strata spread and distribution of favorable reservoir, are joined with gg1-g17102-g177
Exemplified by well seismic profile, laterally followed the trail of by seismic horizon after well shake demarcation, it is seen then that hole Dian Zu stratum stably depositing, the Mesozoic group
J3+K1Development more igneous rock strong reflection amplitude feature, laterally relatively stable distribution, underlie J1+2Stratum is then presented with upper formation
Obvious unconformity contact, seismic wave groups occur cutting cut, the feature of toplap, dip direction also in contrast, the laterally homogeneous change of thickness
Change, from construction in terms of, belong to early stage stratum tectonism, strata denudation late period, stratum early stage simultaneously overlying sediments, after undergo again
Tectonism forms current tectonic feature.So far, the fine correlation division on stratum and the fine synthesis implemented after being of construction
Geologic assessment provides reliable basis (Fig. 7) with well site deployment.
For the ordinary skill in the art, instantiation has simply been carried out exemplary with reference to accompanying drawing to the present invention
Description, it is clear that present invention specific implementation is not subject to the restrictions described above, and can choose typical curve combination according to different regions
And rock and mineral component feature, as long as employing the improvement of the various unsubstantialities of inventive concept and technical scheme of the present invention progress,
Or it is not improved by the present invention design and technical scheme directly apply to other occasions, protection scope of the present invention it
It is interior.
Claims (7)
- A kind of 1. Mesozoic Strata fine correlation method, it is characterised in that comprise the following steps：(1) STRATIGRAPHIC DIVISION：Based on well log curve, fine correlation division stratum；(2) well contrast is joined：Contrasted by step (1) for well connection well across comparison and longitudinal direction, specify regional correlation mark, establish area The stratotype that domain can contrast；(3) well shake Fine calibration：From step (2) establish stratotype, by well shake demarcation by geology contrast characteristic with Seismic trace near well ripple group reflectance signature establishes contact, specifies earthquake reflection line-ups geological Significance；(4) seismic fine interpretation：Carry out earthquake laterally to follow the trail of, carry out fine structural interpretation, specify Mesozoic group inside story layer J3+K1Boundary Limit, J1+2Upper limit, J1+2Lower Limits；(5) residual stratum spread in the Mesozoic group is studied：With reference to step (4) clearly inside story stratum boundary limit, Mesozoic group residual stratum is implemented, Look for Favorable Reservoir.
- 2. control methods according to claim 1, it is characterised in that：Well log curve includes 2.5m described in step (1) Resistivity curve and interval transit time curve.
- 3. control methods according to claim 2, it is characterised in that：In step (1), 2.5m bottom gradients of logging well are utilized Electrode system logging method, as logger above carries, the take-off at once of formation lithology boundary change point is run into, amplitude corresponds to stratum Lithology boundary, with reference to the height of interval transit time value, finely divide stratigraphic boundary.
- 4. control methods according to claim 1, it is characterised in that：In step (2), the correlation marker is Yi Yankuang Quartz content, calcareous, sillar composition and Diagenetic are correlation marker in sample.
- 5. control methods according to claim 1, it is characterised in that：In step (3), clear and definite stratum geological information leads to Well shake Fine calibration and earthquake reflected wave lineups opening relationships are crossed, assigns seismic event geological Significance.
- 6. control methods according to claim 1, it is characterised in that：J3+K1Develop igneous rock, J in top1+2Upper limit is developed Relatively stable low GR, high resistivity, the block sandstone feature of the praetersonic time difference, J1+2Lower Limits are mainly high resistivity amplitude Sandstone.
- A kind of 7. Mesozoic Strata fine correlation method, it is characterised in that comprise the following steps：(1) STRATIGRAPHIC DIVISION：2.5m resistivity curves combination interval transit time curve comprehensive division Mesozoic group bottom and top beds and inside story Stratum boundary limits；(2) well contrast is joined：With reference to how salty well STRATIGRAPHIC DIVISION information, carry out connection well across comparison and longitudinal direction contrasts, it is determined that in The raw big stratum boundary limit in boundary, introduces lithology and mineral feature and establishes correlation marker, with reference to step (1) comprehensive division inside story stratigraphic boundary；(3) well shake Fine calibration：Contact is established by fine well shake demarcation, assigns reflection line-ups actual geology meaning Justice, by Seismic reflection sequences feature and unconformity feature, establish the canonical profile that can laterally contrast；(4) seismic fine interpretation：Constrained by step (3) by canonical profile, establish the whole district and explain screen work, carry out Seismology and Geology layer Position laterally tracking, carries out fine structural interpretation, successively refines, identify Mesozoic group inside story layer and special geobody spread；(5) residual stratum spread in the Mesozoic group is studied：On the basis of the fine STRATIGRAPHIC DIVISION of step (4) and integrated interpretation, with reference to rock Electrical feature, paleontological characteristics, Mesozoic Strata unconformity contact relation and the evaluation of reflection wave groups characteristic synthetic, implement the Mesozoic group Residual stratum spread and thickness characteristics, look for favourable storage.
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