Source Fault Sand Space Configuration Of SPG Oil Layer And Its Reservoir-Controlling Effect In Aogula-Halahai Area Of Daqing

In order to study the distribution of oil and gas in the SPG oil layer in Daqing Aogula-Halahai area and guide its oil and gas exploration,it is based on the study of the development and distribution of effective source rocks,the development and distribution of fault convex ridges and the development and distribution of connected sand bodies.Through the analysis of the relationship between the effective source rock area and the fault convex ridge spatial configuration,to study the source fault spatial configuration;Through the analysis of the relationship between the migration favorable parts of oil-gas in source fault spatial configuration and the connected sand body,to divide the source fault sand spatial configuration into three levels:poor,better and best.Then combined with oil and gas distribution law in the Aogula-Halahai area of Daqing,to study the control effect of the source fault sands spatial confuguration to the oil-gas distribution and accumulation of the SPG oil layer.This research mainly has the following three aspects of understanding:（1）The effective source rock in the Aogula-Halahai area of Daqing is the dark mudstone of the K₂qn₁,with an average thickness greater than 50m and a maximum thickness of 180m.The average TOC is greater than 2%,and the average Ro is greater than1%,which is a high-quality source rock in the study area.The oil source fault convex ridge is an advantageous part of the migration of hydrocarbons generated from source rocks to the connected sand bodies in the study area.It is similar that the distribution of the T1G4,T1-1,and T1 structural layers,and only moves slightly in the opposite direction of the fault tendency.There are differences in the sand body connectivity of each oil layer group in the study area.The middle and north of the S1 oil layer group,the entire area of the S2 oil layer group,the central and northern area of the S3 oil layer group,most of the PI1.PI2.PI3 oil layer group,and the northeast of G0.G1.G2.G3.G4,the sand layer ratio is generally greater than 0.25,and the sand bodies are initially connected or completely connected;the sand layer ratio of the S0 oil layer group is low,generally lower than 0.25,and the sand bodies are not connected.（2）The spatial configuration of source fault sand refers to the spatial coupling relationship between the migration favorable part of oil-gas in the source fault space configuration（the convex ridge of the oil source fracture）and the connected sand body.According to the connectivity of sand bodies nearby the migration favorable part of oil-gas,the source fault sand space configuration rank is divided.When the sand body sand-layer ratio is greater than the sand body large-range connectivity threshold C,the sand body is basically fully connected and the source fault sand spatial configuration is well;When the sand body sand-layer ratio is between the initial connectivity threshold C0 of the sand body and the large-range threshold C,the sand body has a certain degree of connectivity,and the source fault sand space configuration is better;When the sand body sand-layer ratio is less than the initial connectivity threshold C0 of the sand body,the sand body is not connected,the source fault sand space configuration is poor,and the source fault sand space configuration has different characteristics in different regions of each oil layer group.（3）The effect of the source fault sand space configuration to accumulation and distribution of oil-gas in the Daqing Aogula-Halahai area is mainly manifested in two aspects:（1）The spatial configuration of source fault sands controls the oil and gas plane accumulation area.In S oil layer,well-arranged of source fault sand space configuration is located in the southern Halahai fault zone,the middle of the Talaha fault zone,and the middle and north of the Longhupao anticline,which are the main accumulation areas of oil-gas planes.In P oil layer,well-arranged of source fault sand space configuration is located south and north of the Talaha fault zone,the Longhupao anticline,which are the main accumulation areas of oil-gas planes.In P oil layer,well-arranged of source fault sand space configuration is located central area of Talaha fault zone and the Xiaolinzi break zones,which are the main accumulation areas of oil-gas planes;（2）The spatial distribution of source fault sands controls the oil-gas accumulation layers,and the well-layers of source fault sands spatial configuration are S1,S2,PI1,PI2,PI3,and G3,which are the main accumulation layers in the vertical direction.