Diagenesis and porosity evolution of sandstone reservoirs in the East II part of Sulige gas field, Ordos Basin
Diagenesis and porosity evolution of sandstone reservoirs in the East II part of Sulige gas field, Ordos Basin
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DOI：
10.1016/j.ijmst.2012.04.005
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发表时间：
2012-05
影响因子：
11.8
通讯作者：
Renchao Yang;A. Fan;Zuozhen Han;Xiuping Wang
中科院分区：
文献类型：
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作者：
Renchao Yang;A. Fan;Zuozhen Han;Xiuping Wang
鄂尔多斯盆地苏里格气田东部以致密砂岩气藏为主，正成为该区天然气勘探开发的重要控制因素。采用切片识别、铸造切片、扫描电镜、x射线衍射等实验方法，对苏里格气田东二段二叠系山西组山一段和石河子组河8段储层岩石学及成岩作用特征进行了研究。结果表明：(1)该区主要砂岩以岩屑砂岩和岩屑硅屑岩为主，成熟度较低；(2)该区砂岩的成岩作用主要有压实作用、胶结作用、腐蚀作用和蚀变作用。结论如下：(1)成岩阶段达到中成岩阶段B期；(2)早期成岩压实作用是降低孔隙度的主要因素之一；(3)中成岩阶段A期酸性介质条件下腐蚀形成的次生孔隙能明显改善砂岩储层能力差的状况；(4)中成岩阶段B期胶结作用是导致砂岩储层物性差的最重要因素。
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.