A Refinement Exploration Research On Sand-conglomerate Bodies' Characters Of Reservoir Which In Eastern Steep Slope Belt Of West Depression

The research on the block structure is located in the north of eastern steep slope belt which in the Western SAG of Liaohe and the Chenjia subsag area,structural area is 166.2km2.Archean erathem buried hill reservoir,the paleogene Shahejie formation oil reservoir and Dongying group reservoir have been found.Among them,the Shahejie formation reservoir is the main reservoir in the Lengjia oilfield.Drilling revealed the formation from the bottom up as follows: Archean,Mesozoic and Cenozoic tertiary Fangshenpao group,the group of the Shahejie formation,Dongying,Guantao formation of Neogene,Minghuazhen group and Quaternary System.The heavy oil reservoir in Lengjia first controlled by the sedimentary facies characteristics under construction background with a specific control in the steep slopes.There are two sedimentary systems in the oilfield: steep slope type fan delta-slump turbidite fan and axial gravity flow channel sedimentary systems.Deep faults of Lengjia steep slope are quite developed,to provide oil and gas vertical migration conditions directly.The belt near the source distribution,and good oil source,the match of structure and sedimentary and other elements,provides the guarantee of the oil and gas enrichment in the region.The fan delta sedimentary facies under the control of deep faults in the actic region decided thick-block bottom water,edge thick layer of bottom water reservoirs development mode.The area developed active-controlled and fault-controlled of two accumulation reservoir modes,hydrocarbon source rock distribution and sedimentary facies belt control the oil and gas enrichment degree,it has great exploration potential.It is the development characteristics of the area,bounded by Chen's fault,less oil-bearing series in Lengjia of the West SAG,Shasan reservoir developed quickly,the oil layer thickness;more oil-bearing series in the Lengjia faulted anticlinal belt,four sets of oil-bearing series has all developed,and the thickness of oil,especially in the Shasan formation the most developed.Lengjia steep slope of deep faults are quite developed,to provide the vertical migration conditions for oil and gas directly.The belt near the source distribution,and good oil source,structure sediment and other elements of the match,has provided a guarantee for hydrocarbon enrichment.