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The Tight Sandstone Reservoir Assessment In The Third Member Of Shahejie Formation Of Shuangtaizi Area In Liaohe Depression

Posted on:2017-05-01Degree:MasterType:Thesis
Country:ChinaCandidate:H F MaFull Text:PDF
GTID:2180330488460404Subject:Geological engineering
Abstract/Summary:PDF Full Text Request
The western sag of Liaohe Depression is rich in oil-gas resources, and oil-gas shows active, which has great exploration potential, limited by many factors such as the burial depth is deep the exploration degree of Es3 tight sandstone reservoir is relative low. So carry out the comprehensive evaluation of reservoir quality of Es3 tight sandstone has important theoretical and practical significance for oil-gas in lithologic reservoirs and tight sandstone reservoirs accumulation and guide future exploration.This text proceed from the sedimentary evolution of Shuangtaizi Area, by laboratory core observation and conventional logging facies identification, identified the main subfacies of Es3 reservoir in study area are semideep-deep lake and sublacustrine fan, the sedimentary facies in Es3 s is delta-sublacustrine fan-lake, in Es3 z is sublacustrine, while in Es3 x is shallow lake or sublacustrine. At the same time studied the variation law of sedimentary facies controlling effects according to well facies analysis among wells and vertical. The result indicated that: the distribution of sand bodies controlled by palaeogeomorphology and synsedimentary fault, the period of Es3 x is obviously controlled by palaeogeomorphology, while the period of other two is obviously controlled by synsedimentary fault, the sand bodies are distributed along the synsedimentary fault zones. Based on the well facies and core observation description combined with logging and seismic data, the sedimentary microfacies of Es3 reservoir are detailed analysis, and established the depositional model of the study area, which lay the foundation for the determination of reservoir characteristics in later stage.According to the sedimentary microfacies of Es3 reservoir, the lithology of the target layer is mainly composed of feldspar, detritus and quartz, and the composition maturity and structure maturity are low. Through the thin section analysis, the pore types can be divided into four classes, that is intergranular pore, intragranular pore, composite pore and fracture. Then the pore structure in Es3 tight sandstone reservoir performed as large and middle pores, the grading of pore throat is poor, and the spatial dispersion is uneven. The porosity is generally 5 to 10%, the permeability is generally 1 to 10 md.The lower limit value of porosity of Es3 reservoir in Shuangtaizi Area is standardized by oil testing method, porosity and permeability analysis method, permeability and throat median radius binding assay mwthod, taking 3500 m as the boundary, the effective reservoir porosity in shallow strata is 7%, while in deep strata is 6%. Based on the lower limit value of effective reservoir and actual oilfield production data, dividide the property of reservoir in study area, the favorable areas are mainly distributed in the middle sublacustrine fan subfacies, while Es3 z and Es3 x are the favorable formations for oil-gas accumulation.
Keywords/Search Tags:the Shuangtaizi Area, Es3 Formation, tight sandstone reservoir, sedimentary characteristics, reservoir physical property, reservoir comprehensive evaluation
PDF Full Text Request
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