Geological Characteristics Of Reservoir PU I1-4East Block Of West1st South Area

Geological Characteristics Research is a comprehensive technology, which include loganalysis, parameter interpretation, reserve calculation, structural analysis on the basis ofcorrelation of formations, etc.East Block of West1stSouth Area is one of the three main blocks of Pu I reservoir ofSazhong development zone. In coordination with the tertiary recovery and flooding scheme ofthe West1stSouth Area, research of characteristics of reservoir Pu I-4East Block of West1stSouth Area is conducted.After launching the project, by collecting a large amount of theoriginal data and foreign and domestic literatures, from studying basic units of oil layers, weachieved computer correlation of formations, established two-dimensional geological researchwork platform, analyzed the data of1200wells, contrasted27well arrays, finely studied thestructure and deposition and characteristics of Reservoir PU I-4East Block West1stSouthArea of Sazhong Development Zone, drew index beds of new logging series. On the basis ofcorrelation of formations, we improved thousand of sedimentary unit data, drew unitsedimentary facies belt map, interlayer types distribution map, and sandstone top-bottom tinystructure map of Pu I1-4, studied the characteristics, types and distribution, heterogeneity andregional structure of its sedimentary sand body.Through the study we found that, with the continuous infilling of well pattern in EastBlock of West1st South Area, the geometric shapes of most of the sand bodies are changed,their continuity and directivity are also changed, sand body distribution gets complicated,reservoir heterogeneity gets severe, sand bodies are overlapped between different units,remaining oil is mainly located at the top of positive rhythm reservoir, variation location ofmulti-segment and multi-rhythm reservoir, interlayer of lateral accretion, the shields of thefaults, the top part of tiny structure.The study result will make the relations of facies belts and wells connection on the plane,and the data of the subdivision sedimentary facies tend to be rational...