| Jiangjiadian area is located in the south slope of Linnan sag,which is a nosing structure of Xiakou fault zone.There are some sand bodies and faults,which jointly control the formation and distribution of oil and gas reservoirs.There is a lack of quantitative research on sand body transmission capacity and fault sealing property in the study area,and the control effect of the transport system on oil and gas reservoirs is not clear.Therefore,it is of great significance to carry out the research on sand body and fault transport conductor to effectively guide oil and gas exploration and development in the study area.In this paper,the distribution and physical properties of sand bodies are studied,and the minimum net to grass ratio required for sand body connectivity is determined by counting the net to grass ratio of sand bodies with oil and gas shows,so as to clarify the connection range of sand bodies.The characteristics,activity and combination patterns of main faults in the study area are analyzed,and the lateral and vertical sealing ability of four main faults are evaluated by various method,and the sealing ability of faults in different horizons is comprehensively analyzed.The three-dimensional sealing ability of faults is evaluated by calculating the shale gouge ratio(SGR)of different parts of fault in three-dimensional space.The profile configuration relationship between fault and sand body is analyzed.The product of sand body thickness and porosity with oil and gas show intervals is used to characterize the transport capacity of sand body.The plane configuration relationship between sand body and faults is analyzed by combining the sand transmission coefficient and fault sealing.The plane configuration relationship between sand bodies and faults is analyzed by combining the transmission coefficient of sand bodies with fault sealing.The fault and layer model is established by software,and the petromod software is used to simulate and determine the migration path of oil and gas.Through the study of sand bodies,faults and migration paths in the study area,the control effect of transport system on the oil and gas reservoirs in the study area are analyzed,and the favorable targets are predicted.The results show that the sand bodies in the south of the lower Es3 and Es4 sand groups are thicker than those in the north,with better physical properties and connectivity,which can be used as channels for lateral migration of oil and gas and good reservoirs.The plane combination patterns of faults mainly include parallel pattern,oblique pattern,grid pattern,etc;the profile combination patterns mainly include stair-stepping pattern,horst pattern,flower structure pattern,etc.The evaluation results of three-dimensional sealing of faults are in accord with the evaluation results of various methods,which indicates that the 3D simulation results are relatively reliable.The profile configuration of faults and sand bodied mainly includes "Tshape" type,anti "Z-shape" type and stair-stepping type.The oil and gas migration pathways simulation shows that oil and gas generated in Linnan sag migrated to all sides,and some oil and gas migrated to the south and upper strata along the open faults and connected sand bodies,and accumulated in fault traps and structural lithologic traps.The simulation results are in good accord with the distribution of current reservoirs.The oil and gas are more abundant in the area where there are some sand bodies and faults,and the horst fault block reservoirs and the steptype fault block reservoirs are formed by fault cutting;the near source "T-shape" type transport mode has a single hydrocarbon accumulation horizon,and the anti "Z-shape" type and stairstepping type mixed transport mode makes the hydrocarbon reservoir multi-layer distribution.The areas with developed sand bodies and faults are favorable for hydrocarbon accumulation.Two favorable exploration areas are predicted: Xiakou fault haning wall consequent ridge belt and xia90 consequent ridge belt. |
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