Diagenesis and porosity evolution of sandstone reservoirs in the East II part of Sulige gas field, Ordos Basin

查看全文 作　　者：Yang Renchao Fan Aiping Han Zuozhen Wang [1]Xiuping

机构地区：[1]Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Minerals, College of Geological Sciences and Engineering,Shandong University of Science and Technology, Qingdao 266510, China

出　　处：《International Journal of Mining Science and Technology》索引2012年第22卷第3期,共6页

基　　金：supported by the Science Development Project of Shandong Province (No.2009GG20001021-07);the Open Fund of Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals (No. DMSM200803);the SDUST Research Fund (No.2010KYTD103) 摘　　要：It is becoming an important controlling factor of gas exploration and exploitation in the east part of Sulige gas field in the Ordos Basin where the reservoir of main gas formations is tight sandstones. Employing experimental methods of slice identification, casting slice, scan electron microscope, and X-ray diffractions, we studied the characteristics of petrology and diagenesis on reservoirs in Shan1 section of Shanxi formation and He8 section of Shihezi formation of the Permian system in the East II part of Sulige gas field. The results include: (1) the main sandstones in these areas are dominated by lithic sandstone and lithic silicarenite with low grade of maturity; (2) the diagenesis of sandstone in these areas mainly include compaction, cementation, corrosion and alteration. Conclusions are as follows: (1) the diagenetic stage reached period B of the middle diagenetic stage; (2) the early diagenetic compaction is one of the main factors to decreasing porosity; (3) the secondary pores formed by corrosion in acidity medium conditions in period A of the middle diagenetic stage can distinctly ameliorate the poor reservoir capability of sandstone and; (4) cementation in period B of the middle diagenetic stage is the most important factor leading to poor physical property of sandstone reservoirs. 关键词：鄂尔多斯盆地东部苏里格气田砂岩储层成岩作用孔隙演化扫描电子显微镜成岩阶段压实作用

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Diagenesis and porosity evolution of sandstone reservoirs in the East II part of Sulige gas field, Ordos Basin

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