Study On Reservoir Characteristics And Remaining Oil Distribution Of Ordovician Fractures In Tahe 4 Area

In this essay,the reservoirs of the Yingshan formation in the Ordovician of Tahe 4 area are studied.On the basis of previous studies,guided by theories and methods such as reservoir geology,carbonate sedimentary science,logging geology and development geology,this essay analyzes the types and characteristics of Ordovician reservoir space in Tahe Block 4,and systematically summarizes the classification and identification marks,then carry out single well reservoir identification and division.Combined with research results of karst paleomorphology,paleoclimatic characteristics and regional karst,the main controlling factors of the development of Ordovician joint in Tahe Block 4 are analyzed,evaluation standard and development patterns of various types of fracture-cave reservoirs are established.Meanwhile,combining with three-dimensional geological models and characteristics of reservoir development and production,5 typical distributing patterns and distribution characteristics of remaining oil in Tahe Block 4 are established.Research indicates that,3 kinds of reservoirs are found in Tahe Block 4:Fracture-hole type,Cave type and Fractured type.Responses on logging curves are obvious.Based on development intensity and scale of krast in Tahe Block 4,fractured-cave reservoirs are classified into 2 types and 6 sub-types and evaluation standards for each type are also established.Based on classifying,identifying and evaluation of fractured-cave reservoirs,main controlling factors of fractured-cave reservoirs in Tahe Block 4 are analyzed and developing patterns are also established.5 distributing patterns of remaining oil are systematic summarized,and The distribution characteristics of remaining oil in Ordovician of Tahe Block 4 are predicted.