CN104749638A - Determining method of complex mountain-front effective source rock and source rock structural model - Google Patents
Determining method of complex mountain-front effective source rock and source rock structural model Download PDFInfo
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Abstract
The invention discloses a determining method of complex mountain-front effective source rock and a source rock structural model. The method includes the steps of implementing spatial distribution of potential source rock, restoring erosion thickness of different structural unit formations, restoring features of a paleo-geothermal field, determining hydrocarbon conversion type of the source rock by numerical simulation, and determining distribution of the complex mountain-front effective source rock according to the spatial distribution features of the source rock, the hydrocarbon conversion types of the source rocks at different positions of the different structural units and features of abundance of organic matters. Meanwhile, by means of the study based on the method of recovering hydrocarbon conversion of the source rocks in the study area, reliability of resource quantity evaluation is improved, the blank in determining the complex mountain-front effective source rocks is filled, and results help greatly boost the progress of next resource evaluation.
Description
Technical field
The invention belongs to oil-gas exploration resource evaluation technical field, be specifically related to a kind of complicated mountain front Effective source rocks and determine method and hydrocarbon source rock structural model.
Background technology
Piedmont tectonic belts is that the vicinity complex structure in front of the mountains formed due to collision orogeny grows region, grow anticline and the thrust block being arranged as band, there is good trap condition, having the pacing items forming large-scale and super-huge hydrocarbon-bearing pool, is the major fields that domestic and international petroleum gas is broken through.
Although mountain front is one of the region of at present oil gas enrichment the most in the world, but due to the impact by tectonic movement of many phases superimposed reformation, hydrocarbon source rock space distribution is complicated, band is divided in horizontal partition, longitudinally many covers are stacked, and experience the structure lifting of many phases and stratum settlement, bury raw hydrocarbon history complexity, cause Effective source rocks to determine difficulty large, and then cause that oil-gas exploration risk is high, success ratio is low.It is very few that forefathers determine research to mountain front Effective source rocks, Zou Huayao once analyzed the underlie raw hydrocarbon history of hydrocarbon source rock of obduction zone nappe, think that the stratum that Tectonic superimposition causes thickens fast, make the instantaneous buried raw hydrocarbon of hydrocarbon source rock that underlies, show as thrusting fault belt superposition and significantly fast effect is added to hydrocarbon primary rock producing hydrocarbon, but it develops to the raw hydrocarbon of other tectonic element hydrocarbon source rocks of obduction zone and does not study, whether effective (the Zou Huayao of non-system evaluation obduction zone hydrocarbon source rock, " storehouse car down warping region carat Soviet Union obduction zone late-stage rapid accumulation mechanism ", Chinese science D collects: geoscience), reach the evolutionary pattern that hydrocarbon source rock under thrusting has been inquired in river, but only relate to and singlely push away the impact covered source-rock evolution, push away compared with the complex situations covered too simple with mountain front many phases, and the raw hydrocarbon evolutionary process not illustrating different tectonic element hydrocarbon source rock (reaches river, " foreland basin thrusts nappe sheet and source-rock evolution ", gas industry).Along with the raising of Songliao basin, require more and more meticulousr to hydrocarbon source rock Potential Evaluation, art methods can not meet the demands, and needs to develop more system, meticulous mountain front Effective source rocks and determines method.
Summary of the invention
The object of the invention is to provide a kind of reasonable, effective, practical complicated mountain front Effective source rocks and determines method and hydrocarbon source rock structural model, rationally determines effective source rock development position and hydrocarbon primary rock producing hydrocarbon potentiality, reduces exploration risk, improves exploration success ratio.
For achieving the above object, the technical solution used in the present invention is: a kind of complicated mountain front Effective source rocks determines method, comprises the steps:
Step one: the spatial implementing potential hydrocarbon source rock, comprising:
(1-1) under the guidance of mountain front tectonic model, carry out structural deformation difference analysis, divide hollow zone, thrust belts, nappe-gliding structure, accurate original place stacked tape tectonic element;
(1-2) utilize balanced section technique to carry out structural deformation recovery to key geologic structure section, restore the sedimentary system spread of source rock development phase in conjunction with Sedimentary facies sequences assemblage characteristic, specify the original distribution feature of potential hydrocarbon source rock;
(1-3) according to structural deformation restoration result, use hydrocarbon source rock well shake demarcation, seismic facies, seismic attributes analysis, carry out fine seismic data and explain, implement the spatial of the potential hydrocarbon source rock of different tectonic element;
Step 2: the denuded strata thickness recovering each tectonic element
According to concrete geologic condition and data situation, select the denuded strata thickness of one or more in sonic time difference, vitrinite reflectance rate and reference layer thickness change method each tectonic element described in COMPREHENSIVE CALCULATING step (1-1);
Step 3: recover Paleo-geothermal Field feature
For hollow zone, Apatite fission track experimental data and vitrinite reflectance Ro data are utilized to correct paleogeothermal gradient, to obtain Paleo-geothermal Field feature; For thrust belts, nappe-gliding structure, accurate original place stacked tape, in the time due to nappe 0 ~ 1Ma in place, the thermal perturbation that tectonic movement brings just can be eliminated, and namely temperature profile recovers normal, therefore, thinks that its paleogeothermal gradient feature is identical with hollow zone;
Step 4: according to the sedimentation rising history of hydrocarbon source rock formation, each tectonic element different parts described in step (1-1) chooses well point, structure deposition event and the palaeogeothermal evolutionary process of stratum and experience thereof is defined, by the raw hydrocarbon Evolution type of numerical simulation clearly each tectonic element different parts hydrocarbon source rock in Basinmod numerical simulation software;
Step 5: according to the spatial of the potential hydrocarbon source rock that step one is implemented, the raw hydrocarbon evolutionary model of each tectonic element different parts hydrocarbon source rock that step 4 is set up, in conjunction with the superimposed evaluation of abundance of organic matter index, determines the distribution of complicated mountain front Effective source rocks.
Wherein, in step 2, the precondition of described sonic time difference renwing stratum erosion sediment thickness is: the buried depth of (1) plane of denudation is between 500 ~ 3000m; (2) formation fracture agensis; (3) more than plane of denudation new stratum is less than its following old stratum institute applied pressure and is degraded stratum before degrading to old stratum applied pressure;
The precondition of described vitrinite reflectance rate renwing stratum erosion sediment thickness is: the vitrinite reflectance Ro data of (1) individual well are enriched; (2) on depth section, the ln(Ro on upper and lower stratum) value existence " sudden change ", and should " sudden change " really be caused by strata denudation.
Wherein, in step 2, for hollow zone, utilize sonic time difference, vitrinite reflectance rate, reference layer thickness change method three kinds of method COMPREHENSIVE CALCULATING denuded strata thickness and checking mutually; For nappe-gliding structure, thrust belts, accurate original place stacked tape, because its lost strata is caused by tomography breakthrough, therefore the destination layer original stratigraphic thickness utilizing reference layer thickness change method to recover is deducted residual stratum thickness and try to achieve denuded strata thickness.
Wherein, in step 4, only considered the normal sedimentation on stratum due to Basinmod numerical simulation software and degrade, do not relate to that tectonic activity causes stratum to thicken, thinning situation, tectonization depositionization disposal route is taked in thrust and nappe activity for thrust belts, nappe-gliding structure stratum experience, namely the zone thickness increase caused by counter-rushed overturn is considered as stratum instantaneous (0 ~ 1Ma) deposition and is formed, inverse rushes that zone thickness that primary deposit stratum of pruning causes is thinning to be considered as instantaneous (0 ~ 1Ma) and to degrade formation.
Further, described thrust and nappe activity can be divided into 3 classes according to pushing away the difference covering front and back hydrocarbon source rock formation buried depth to the impact of hydrocarbon primary rock producing hydrocarbon, if hydrocarbon source rock formation pushes away, to cover front buried depth be H, push away that to cover rear buried depth be h: if h > is H, then hydrocarbon source rock continues raw hydrocarbon, and raw hydrocarbon speed becomes large; If h=H, then hydrocarbon source rock continues raw hydrocarbon, and raw hydrocarbon speed is constant; If h < is H, then hydrocarbon primary rock producing hydrocarbon effect is stagnated.
Wherein, in step 5, the defining standard of described Effective source rocks is: content TOC > 0.5%, the 0.5% < vitrinite reflectance Ro < 2.6% of remaining unit mass rock organic carbon; Stagnate if Thermal Evolution of Source Rocks process exists raw hydrocarbon, Effective source rocks is determined, and needs to meet later stage Thermal Evolution of Source Rocks degree higher than the evolution level before its raw hydrocarbon stagnation, i.e. Ro
after> Ro
before.
The embodiment of the present invention also provides a kind of hydrocarbon source rock structural model utilizing above-mentioned complicated mountain front Effective source rocks to determine method establishment, described hydrocarbon source rock structural model is divided into Effective source rocks development area and invalid source rock development district in the vertical, wherein, the region of 0.5% < vitrinite reflectance Ro < 2.6%, hydrocarbon 0.7% < vitrinite reflectance Ro < 2.6% is described Effective source rocks development area;
The region of vitrinite reflectance Ro < 0.5% and vitrinite reflectance Ro > 2.6% is described invalid source rock development district.
Wherein, Effective source rocks development area and invalid source rock development district also can adopt following division methods: buried depth is the region of 2500 ~ 6500m is described Effective source rocks development area, and the region of buried depth < 2500m and buried depth > 6500m is described invalid source rock development district.
Wherein, described hydrocarbon source rock structural model is divided in the horizontal: the simple raw hydrocarbon evolution district that structural deformation is more weak and the raw hydrocarbon evolution district of the complexity that counter-rushed overturn of many phases is transformed strongly, wherein, the hollow zone tectonic element in guide portion of described simple raw hydrocarbon evolution district, the raw hydrocarbon evolution district of described complexity comprises northern nappe-gliding structure, thrust belts and accurate original place stacked tape tectonic element.
Further, described simple raw hydrocarbon evolution district grows and continues to bury the raw hydrocarbon evolutionary pattern of raw hydrocarbon type, and the raw hydrocarbon type of rapid uplift " stagnation " type, fast " buried ", structure sedimentary compensation hydrocarbon type 3 kinds of raw hydrocarbon evolutionary patterns are grown by the raw hydrocarbon evolution district of described complexity.
Describedly continue to bury the raw hydrocarbon evolutionary pattern of raw hydrocarbon type and be distributed in hollow zone, refer to that hydrocarbon source rock formation is totally in and continue the stage of burying, by uplift erosion affect only in the short time raw hydrocarbon stagnate, and compensated by later deposition stratum very soon, hydrocarbon source rock is totally in the Evolution States continuing raw hydrocarbon.
The raw hydrocarbon evolutionary pattern of described rapid uplift " stagnation " type is distributed in the rear rear end of exhibition formula imbrication thrust belts and the front wing of nappe-gliding structure, refer to hydrocarbon source rock after entering initial stage maturation stage owing to affecting rapid lifting by thrusting, raw hydrocarbon evolutionary process is stagnated, later stage push away cover superposition stratum and the thinner thermal evolution on hydrocarbon source rock of sedimentary formation almost without affect, it is ripe that hydrocarbon source rock does not continue increasing, and be in the raw hydrocarbon lag phase.
The raw hydrocarbon evolutionary pattern of described fast " buried " raw hydrocarbon type is distributed in the rear wing of accurate original place stacked tape and nappe-gliding structure, and referring to affects by counter-rushed overturn superposition, and hydrocarbon source rock suffers " buried " and ripe life hydrocarbon rapidly fast.
The raw hydrocarbon evolutionary pattern of described structure sedimentary compensation hydrocarbon type is distributed in the front end of rear exhibition formula imbrication thrust belts, refer to hydrocarbon source rock after entering raw hydrocarbon initial stage owing to affecting rapid lifting by thrusting, raw hydrocarbon evolutionary process is stagnated, thrust superposition stratum and sedimentary formation acting in conjunction afterwards, hydrocarbon source rock buried depth increases, evolution level before evolution level exceedes lifting and enter hydrocarbon.
Because technique scheme is used, the present invention compared with prior art has following advantages:
Effective source rocks of the present invention determine method practicality, reliability by force, accurately reasonable.The present invention is conducive to determining complicated mountain front Effective source rocks, determines the raw hydrocarbon potentiality of hydrocarbon source rock, reduces exploration risk, improves exploration success ratio.
Accompanying drawing explanation
Fig. 1 is that in the embodiment of the present invention one, North of Junggar Basin breathes out mountain mountain front regional location figure;
Fig. 2 is the embodiment of the present invention one Sino-Kazakhstan mountain structural belt Effective source rocks structural model figure;
Fig. 3 is the embodiment of the present invention one Sino-Kazakhstan mountain structural belt Effective source rocks planar characteristics of distribution figure;
Fig. 4 is the embodiment of the present invention one Sino-Kazakhstan mountain structural belt Effective source rocks planar characteristics of distribution figure;
Fig. 5 is the embodiment of the present invention one Sino-Kazakhstan mountain structural belt different block, different tectonic position hydrocarbon primary rock producing hydrocarbon evolutionary pattern figure.
Description of reference numerals:
1, hollow zone;
2, thrust belts;
3, nappe-gliding structure;
4, accurate original place stacked tape.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
Embodiment one: the present invention breathes out mountain mountain front for the North of Junggar Basin shown in Fig. 1, provides a kind of complicated mountain front Effective source rocks to determine method and utilizes this to determine the hydrocarbon source rock structural model as shown in Figure 2 of method establishment.
A kind of complicated mountain front Effective source rocks determines method, comprises the steps:
Step one: the spatial implementing potential hydrocarbon source rock, comprising:
(1-1) under the guidance of mountain front tectonic model, carry out structural deformation difference analysis, divide hollow zone 1, thrust belts 2, nappe-gliding structure 3, accurate original place stacked tape 4 tectonic element;
(1-2) utilize balanced section technique to carry out structural deformation recovery to key geologic structure section, restore the sedimentary system spread of source rock development phase in conjunction with Sedimentary facies sequences assemblage characteristic, specify the original distribution feature of potential hydrocarbon source rock;
(1-3) according to structural deformation restoration result, use hydrocarbon source rock well shake demarcation, seismic facies, seismic attributes analysis, carry out fine seismic data and explain, implement the spatial of the potential hydrocarbon source rock of different tectonic element;
Step 2: the denuded strata thickness recovering each tectonic element
According to concrete geologic condition and data situation, select the denuded strata thickness of one or more in sonic time difference, vitrinite reflectance rate and reference layer thickness change method each tectonic element described in COMPREHENSIVE CALCULATING step (1-1);
Wherein, the precondition of described sonic time difference renwing stratum erosion sediment thickness is: the buried depth of (1) plane of denudation is between 500 ~ 3000m; (2) formation fracture agensis; (3) more than plane of denudation new stratum is less than its following old stratum institute applied pressure and is degraded stratum before degrading to old stratum applied pressure.
The precondition of described vitrinite reflectance rate renwing stratum erosion sediment thickness is: the vitrinite reflectance Ro data of (1) individual well are enriched; (2) on depth section, the ln(Ro on upper and lower stratum) value existence " sudden change ", and " sudden change " really should be caused by strata denudation instead of caused by other reason (as tomography breakthrough etc.).
For hollow zone, utilize sonic time difference, vitrinite reflectance rate, reference layer thickness change method three kinds of method COMPREHENSIVE CALCULATING denuded strata thickness and checking mutually; For nappe-gliding structure, thrust belts, accurate original place stacked tape, because its lost strata is caused by tomography breakthrough, therefore the destination layer original stratigraphic thickness utilizing reference layer thickness change method to recover is deducted residual stratum thickness and try to achieve denuded strata thickness.
Step 3: recover Paleo-geothermal Field feature
For hollow zone, Apatite fission track experimental data and vitrinite reflectance Ro data are utilized to correct paleogeothermal gradient, to obtain Paleo-geothermal Field feature; For thrust belts, nappe-gliding structure, accurate original place stacked tape, in the time due to nappe about 0 ~ 1Ma in place, the thermal perturbation that tectonic movement brings just can be eliminated, and namely temperature profile recovers normal, therefore, thinks that its paleogeothermal gradient feature is identical with hollow zone;
Step 4: according to the sedimentation rising history of hydrocarbon source rock formation, each tectonic element different parts described in step (1-1) chooses typical well (or virtual log), structure deposition event and the palaeogeothermal evolutionary process of stratum and experience thereof is defined, by the raw hydrocarbon Evolution type of the clear and definite hydrocarbon source rock of numerical simulation each tectonic element different parts typical case well (or virtual log) hydrocarbon source rock in Basinmod numerical simulation software;
Only considered the normal sedimentation on stratum due to Basinmod numerical simulation software and degrade, do not relate to that tectonic activity causes stratum to thicken, thinning situation, tectonization depositionization disposal route is taked in thrust and nappe activity for thrust belts, nappe-gliding structure stratum experience, namely the zone thickness increase caused by counter-rushed overturn is considered as stratum instantaneous (0 ~ 1Ma) deposition and is formed, inverse rushes that zone thickness that primary deposit stratum of pruning causes is thinning to be considered as instantaneous (0 ~ 1Ma) and to degrade formation.
Described thrust and nappe activity can be divided into 3 classes according to pushing away the difference covering front and back hydrocarbon source rock formation buried depth to the impact of hydrocarbon primary rock producing hydrocarbon, if hydrocarbon source rock formation pushes away, to cover front buried depth be H, push away that to cover rear buried depth be h: if h > is H, then hydrocarbon source rock continues raw hydrocarbon, and raw hydrocarbon speed becomes large; If h=H, then hydrocarbon source rock continues raw hydrocarbon, and raw hydrocarbon speed is constant; If h < is H, then hydrocarbon primary rock producing hydrocarbon effect is stagnated.
Step 5: according to the spatial of the potential hydrocarbon source rock that step one is implemented, the raw hydrocarbon evolutionary model of each tectonic element different parts typical case well (or virtual log) hydrocarbon source rock that step 4 is set up, in conjunction with the superimposed evaluation of abundance of organic matter index, determine the distribution of complicated mountain front Effective source rocks.
Wherein, the defining standard of described Effective source rocks is: content TOC > 0.5%, the 0.5% < vitrinite reflectance Ro < 2.6% of remaining unit mass rock organic carbon; Stagnate if Thermal Evolution of Source Rocks process exists raw hydrocarbon, Effective source rocks is determined, and needs to meet later stage Thermal Evolution of Source Rocks degree higher than the evolution level before its raw hydrocarbon stagnation, i.e. Ro
after> Ro
before.
The present invention also provides a kind of hydrocarbon source rock structural model as shown in Figure 2 utilizing above-mentioned complicated mountain front Effective source rocks to determine method establishment, and its planar characteristics of distribution figure as shown in Figure 3, Figure 4.Described hydrocarbon source rock structural model is divided into Effective source rocks development area and invalid source rock development district in the vertical, wherein, 0.5% < vitrinite reflectance Ro < 2.6%(buried depth 2500 ~ 6500m), the region of hydrocarbon 0.7% < vitrinite reflectance Ro < 2.6% is described Effective source rocks development area.
Vitrinite reflectance Ro < 0.5%(buried depth < 2500m) and vitrinite reflectance Ro > 2.6%(buried depth > 6500m) region be described invalid source rock development district.In Fig. 3, the north of vitrinite reflectance Ro > 2.6% is invalid source rock development district, and in Fig. 4, the south of vitrinite reflectance Ro < 0.7% is invalid source rock development district.
Described hydrocarbon source rock structural model is divided in the horizontal: the simple raw hydrocarbon evolution district that structural deformation is more weak and the raw hydrocarbon evolution district of the complexity that counter-rushed overturn of many phases is transformed strongly, wherein, the agate lake hollow zone tectonic element in guide portion of described simple raw hydrocarbon evolution district, the raw hydrocarbon evolution district of described complexity comprises northern mountain, Kazakhstan nappe-gliding structure, thrust belts and accurate original place stacked tape tectonic element.
As shown in Figure 5, described simple raw hydrocarbon evolution district grows and continues to bury the raw hydrocarbon evolutionary pattern of raw hydrocarbon type, and the raw hydrocarbon type of rapid uplift " stagnation " type, fast " buried ", structure sedimentary compensation hydrocarbon type 3 kinds of raw hydrocarbon evolutionary patterns are grown by the raw hydrocarbon evolution district of described complexity.
Specific descriptions are: described continuing buries the raw hydrocarbon evolutionary pattern of raw hydrocarbon type, be distributed in agate lake hollow zone, for fn1 well, hydrocarbon source rock formation is totally in and continues the stage of burying, by uplift erosion affect only in the short time raw hydrocarbon stagnate, and compensated by later deposition stratum very soon, hydrocarbon source rock is totally in the Evolution States continuing raw hydrocarbon.
The raw hydrocarbon evolutionary pattern of described rapid uplift " stagnation " type, be distributed in the rear rear end of exhibition formula imbrication thrust belts and the front wing of nappe-gliding structure, for hq6 well, hydrocarbon source rock after late Permian enters initial stage maturation stage owing to affecting rapid lifting by thrusting, raw hydrocarbon evolutionary process is stagnated, and the later stage (latest Permian-now) pushes away and covers superposition stratum and the thinner thermal evolution on hydrocarbon source rock of sedimentary formation almost without impact, it is ripe that hydrocarbon source rock does not continue increasing, and be in the raw hydrocarbon lag phase.
The raw hydrocarbon evolutionary pattern of described fast " buried " raw hydrocarbon type, is distributed in the rear wing of accurate original place stacked tape and nappe-gliding structure, for hs3 well, affects by late Permian counter-rushed overturn superposition, and hydrocarbon source rock suffers " buried " and ripe life hydrocarbon rapidly fast.
The raw hydrocarbon evolutionary pattern of described structure sedimentary compensation hydrocarbon type, be distributed in the front end of rear exhibition formula imbrication thrust belts, for fg4 well, hydrocarbon source rock after late Permian enters raw hydrocarbon initial stage owing to affecting rapid lifting by thrusting, raw hydrocarbon evolutionary process is stagnated, push away by latest Permian afterwards and covered superposition stratum and sedimentary formation acting in conjunction since Triassic period, hydrocarbon source rock buried depth increases, and before evolution level exceedes lifting, evolution level enters hydrocarbon.
Adopt technique scheme, Effective source rocks of the present invention determines that method is reasonable, reliability is strong, model is accurately reasonable.The present invention is under the guidance of complicated mountain front geologic structure model, utilize balanced section technique and Wal rope phase rule principle to carry out structure deposition to restore, use multiple means to carry out hydrocarbon source rock position fine seismic data to explain, implement the potential hydrocarbon source rock spatial of different tectonic element, and then adopt tectonization depositionization disposal route, Apatite fission track and vitrinite reflectance inverting Paleo-geothermal Field technology are to the buried history of mountain front hydrocarbon source rock, thermal history is recovered, thus set up the raw hydrocarbon evolutionary pattern of different tectonic element different parts hydrocarbon source rock, to determine the distribution of complicated mountain front Effective source rocks.The present invention can determine effective source rock development position and accurate evaluation hydrocarbon primary rock producing hydrocarbon potentiality, reduces exploration risk, improves exploration success ratio.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvement or replacement, these improve or replace and also should be considered as protection scope of the present invention.
Claims (10)
1. complicated mountain front Effective source rocks determines a method, it is characterized in that, comprises the steps:
Step one: the spatial implementing potential hydrocarbon source rock, comprising:
(1-1) under the guidance of mountain front tectonic model, carry out structural deformation difference analysis, divide hollow zone, thrust belts, nappe-gliding structure, accurate original place stacked tape tectonic element;
(1-2) utilize balanced section technique to carry out structural deformation recovery to key geologic structure section, restore the sedimentary system spread of source rock development phase in conjunction with Sedimentary facies sequences assemblage characteristic, specify the original distribution feature of potential hydrocarbon source rock;
(1-3) according to structural deformation restoration result, use hydrocarbon source rock well shake demarcation, seismic facies, seismic attributes analysis, carry out fine seismic data and explain, implement the spatial of the potential hydrocarbon source rock of different tectonic element;
Step 2: the denuded strata thickness recovering each tectonic element
According to concrete geologic condition and data situation, select the denuded strata thickness of one or more in sonic time difference, vitrinite reflectance rate and reference layer thickness change method each tectonic element described in COMPREHENSIVE CALCULATING step (1-1);
Step 3: recover Paleo-geothermal Field feature
For hollow zone, Apatite fission track experimental data and vitrinite reflectance Ro data are utilized to correct paleogeothermal gradient, to obtain Paleo-geothermal Field feature; For thrust belts, nappe-gliding structure, accurate original place stacked tape, in the time due to nappe 0 ~ 1Ma in place, the thermal perturbation that tectonic movement brings just can be eliminated, and namely temperature profile recovers normal, therefore, thinks that its paleogeothermal gradient feature is identical with hollow zone;
Step 4: according to the sedimentation rising history of hydrocarbon source rock formation, each tectonic element different parts described in step (1-1) chooses well point, structure deposition event and the palaeogeothermal evolutionary process of stratum and experience thereof is defined, by the raw hydrocarbon Evolution type of numerical simulation clearly each tectonic element different parts hydrocarbon source rock in Basinmod numerical simulation software;
Step 5: according to the spatial of the potential hydrocarbon source rock that step one is implemented, the raw hydrocarbon evolutionary model of each tectonic element different parts hydrocarbon source rock that step 4 is set up, in conjunction with the superimposed evaluation of abundance of organic matter index, determines the distribution of complicated mountain front Effective source rocks.
2. complicated mountain front Effective source rocks according to claim 1 determines method, it is characterized in that, in step 2, the precondition of described sonic time difference renwing stratum erosion sediment thickness is: the buried depth of (1) plane of denudation is between 500 ~ 3000m; (2) formation fracture agensis; (3) more than plane of denudation new stratum is less than its following old stratum institute applied pressure and is degraded stratum before degrading to old stratum applied pressure;
The precondition of described vitrinite reflectance rate renwing stratum erosion sediment thickness is: the vitrinite reflectance Ro data of (1) individual well are enriched; (2) on depth section, the ln(Ro on upper and lower stratum) there is sudden change in value, and this sudden change is caused by strata denudation really.
3. complicated mountain front Effective source rocks according to claim 1 determines method, it is characterized in that, in step 2, for hollow zone, utilize sonic time difference, vitrinite reflectance rate, reference layer thickness change method three kinds of method COMPREHENSIVE CALCULATING denuded strata thickness and checking mutually; For nappe-gliding structure, thrust belts, accurate original place stacked tape, because its lost strata is caused by tomography breakthrough, therefore the destination layer original stratigraphic thickness utilizing reference layer thickness change method to recover is deducted residual stratum thickness and try to achieve denuded strata thickness.
4. complicated mountain front Effective source rocks according to claim 1 determines method, it is characterized in that, in step 4, tectonization depositionization disposal route is taked in thrust and nappe activity for thrust belts, nappe-gliding structure stratum experience, namely the zone thickness increase caused by counter-rushed overturn is considered as stratum instantaneous deposition and is formed, and inverse punching thinning being considered as of zone thickness that primary deposit stratum causes of pruning instantaneously degrades formation.
5. complicated mountain front Effective source rocks according to claim 4 determines method, it is characterized in that, described thrust and nappe activity can be divided into 3 classes according to pushing away the difference covering front and back hydrocarbon source rock formation buried depth to the impact of hydrocarbon primary rock producing hydrocarbon, if hydrocarbon source rock formation pushes away, to cover front buried depth be H, push away that to cover rear buried depth be h: if h > is H, then hydrocarbon source rock continues raw hydrocarbon, and raw hydrocarbon speed becomes large; If h=H, then hydrocarbon source rock continues raw hydrocarbon, and raw hydrocarbon speed is constant; If h < is H, then hydrocarbon primary rock producing hydrocarbon effect is stagnated.
6. complicated mountain front Effective source rocks according to claim 1 determines method, it is characterized in that, in step 5, the defining standard of described Effective source rocks is: content TOC > 0.5%, the 0.5% < vitrinite reflectance Ro < 2.6% of remaining unit mass rock organic carbon; Stagnate if Thermal Evolution of Source Rocks process exists raw hydrocarbon, Effective source rocks is determined, and needs to meet later stage Thermal Evolution of Source Rocks degree higher than the evolution level before its raw hydrocarbon stagnation.
7. the hydrocarbon source rock structural model utilizing the complicated mountain front Effective source rocks according to any one of claim 1 ~ 6 to determine method establishment, it is characterized in that, described hydrocarbon source rock structural model is divided into Effective source rocks development area and invalid source rock development district in the vertical, wherein, the region of 0.5% < vitrinite reflectance Ro < 2.6%, hydrocarbon 0.7% < vitrinite reflectance Ro < 2.6% is described Effective source rocks development area;
The region of vitrinite reflectance Ro < 0.5% and vitrinite reflectance Ro > 2.6% is described invalid source rock development district.
8. hydrocarbon source rock structural model according to claim 7, it is characterized in that, buried depth is the region of 2500 ~ 6500m is described Effective source rocks development area, and the region of buried depth < 2500m and buried depth > 6500m is described invalid source rock development district.
9. hydrocarbon source rock structural model according to claim 7, it is characterized in that, described hydrocarbon source rock structural model is divided in the horizontal: the simple raw hydrocarbon evolution district that structural deformation is more weak and the raw hydrocarbon evolution district of the complexity that counter-rushed overturn of many phases is transformed strongly, wherein, the hollow zone tectonic element in guide portion of described simple raw hydrocarbon evolution district, the raw hydrocarbon evolution district of described complexity comprises northern nappe-gliding structure, thrust belts and accurate original place stacked tape tectonic element.
10. hydrocarbon source rock structural model according to claim 9, it is characterized in that, described simple raw hydrocarbon evolution district grows and continues to bury the raw hydrocarbon evolutionary pattern of raw hydrocarbon type, and the raw hydrocarbon type of rapid uplift " stagnation " type, fast " buried ", structure sedimentary compensation hydrocarbon type 3 kinds of raw hydrocarbon evolutionary patterns are grown by the raw hydrocarbon evolution district of described complexity.
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| CN109613213A (en) * | 2019-01-14 | 2019-04-12 | 中南大学 | It is a kind of multi-functional at hydrocarbon diagenesis high temperature and pressure imitative experimental appliance and its application method |
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| CN110954969A (en) * | 2019-10-28 | 2020-04-03 | 中国石油大港油田勘探开发研究院 | Method for judging and identifying hydrocarbon generation period of ancient hydrocarbon source rock |
| CN113589398A (en) * | 2020-04-30 | 2021-11-02 | 中国石油化工股份有限公司 | Quantitative classification method for effective hydrocarbon source rock organic phase |
| CN113589398B (en) * | 2020-04-30 | 2024-03-19 | 中国石油化工股份有限公司 | Quantitative classification method for organic phase of effective source rock |
| CN114660269A (en) * | 2022-03-23 | 2022-06-24 | 中国海洋石油集团有限公司 | Recovery method for dynamic natural gas accumulation process of ancient buried hill |
| CN114660269B (en) * | 2022-03-23 | 2023-09-19 | 中国海洋石油集团有限公司 | Method for recovering natural gas dynamic hiding process of ancient buried hill |
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