Sandbody Distribution And Research Of Favorable Reservoir In The T'Yi Layer Of Honghaoerrshu Depression

The Honghaoerrshu Depression is one of the earliest and largest oil-rich sags in Erlian Basin.So far eight oil and gas structures have been discovered in the depression.With the deepening of exploration,the Depression has become the "secondary exploration" key areas.The target area studied in this paper is the Honghaoerrshu Depression,and the layer is T'Yi which an oil-rich layer in the Tenggeer group.The paper summarizes out the sedimentary system characteristics and beneficial reservoirs characteristics of the area,through the study of sedimentary facies at macro level and reservoirs at micro level,thus finding the favorable exploration targets and providing the geological basis for the next work.On the basis of the three-level sequence division,according to the high-resolution sequence stratigraphy theory,the target stratum will be divided into three groups of sands: Tengyi up,Tengyi middle,and Tengyi.A unified stratigraphic sequence will be established in the study area.Based on the paleogeomorphology,sand body thickness analysis and heavy minerals method,the source direction was comprehensively analyzed.The comprehensive analysis indicated that the sediment source came from the southern steep slope belt and the northern gentle slope belt,with the southern part mainly and the northern part having a smaller contribution.Through the description of core observations in each sand group,combined with electrical data and analytical test results for single well phase analysis,well phase analysis,and seismic phase analysis,the fan delta,braided river delta,and slumping fan were identified.And the lakes,the four main types of sedimentary facies;on this basis,through core data,sheet data,and other analytical and analytical data,a summary of reservoir petrological characteristics,types of reservoir space,characteristics of reservoir properties,and main control factors in the study area Analyzed and inferred that the overall performance of the reservoirsand body is characterized by low porosity and low permeability,among which the fan delta front sand body,especially the underwater distributary channel sand body,has the best reservoir properties;the cementation and compaction can be reduced in the main control factors.Reservoir reservoir properties,while the late dissolution can effectively improve the reservoir properties.According to certain criteria,the study area is divided into three types of reservoirs,and three favorable reservoirs for Type I,Type II,and Type III reservoirs are predicted.