Application of overlapping probability method in carbonate reservoir evaluation: a case study on 4th member of Shahejie Formation in Gaosheng area of western sag, Liaohe depression

doi:10.3969/j.issn.1672-7703.2019.03.009

Abstract

Abstract: The formation and development of carbonate reservoirs in 4^th member of Shahejie Formation (Es₄) in Gaosheng area, western sag in Liaohe depression, are mainly controlled by sedimentary facies, burial dissolution and tectonic fractures. Whether microscopically or macroscopically, the reservoirs are strongly heterogeneous and controlled by many factors, and the porosity and permeability are very complex. In order to avoid the deviation caused by single factors, and less drilling and logging data when evaluating regional carbonate reservoirs, the Relief F algorithm for feature selection was used to analyze the thickness, porosity, permeability, brittleness index and fracture density of the carbonate rock and the grained limestone (dolomite), and their weights; then the feature plans were overlapped to create a multi-factor probability map; and finally a reservoir evaluation map was built by dividing the probability. In addition, considering the structural and sedimentary facies characteristics in research area, the carbonate reservoirs in Es₄ were investigated and evaluated. The evaluation results are in good agreement with the results from field exploration. Based on the results, favorable exploration zones were predicted.

Key words: western sag in Liaohe depression, 4^th member of Shahejie Formation, carbonate reservoir, weight analysis, overlapping probability method

CLC Number:

Li Yang, Dai Zongyang, Huang Lei, Zhou Xiaolong, Ge Weifeng, Shan Junfeng, Liu Ning. Application of overlapping probability method in carbonate reservoir evaluation: a case study on 4^th member of Shahejie Formation in Gaosheng area of western sag, Liaohe depression[J]. China Petroleum Exploration, 2019, 24(3): 361-368.

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Application of overlapping probability method in carbonate reservoir evaluation: a case study on 4^th member of Shahejie Formation in Gaosheng area of western sag, Liaohe depression

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