塔里木盆地塔中北坡奧陶系碳酸鹽巖巖溶儲層的形成機理
[Abstract]:Ordovician carbonate reservoir on the northern slope of Tarim Basin has become one of the important targets of oil and gas exploration in this basin. Therefore, based on the comprehensive research results of sedimentation, sequence and reservoir, combined with the results of microscopic analysis and seismic data analysis, the carbonate karst reservoirs in this area are divided into limestone dissolution voids. The formation mechanism of dolomite pore type and siliceous rock fracture hole type is discussed. The results show that: (1) the limestone cavities are distributed vertically in the upper member of the Yingshan formation and the Yijianfang formation in the middle Ordovician formation. The dolomite porosity reservoir is mainly developed in the lower member of Penglai Ba formation and Yingshan formation of Lower Ordovician, and the thickness of the reservoir is large. (2) the limestone dissolution porosity reservoir is formed in the third order sequence interface (low stage) karstification. The dolomite porosity reservoir is mainly formed by the deep-buried dolomitization controlled by the third-order sequence interface karstification. (3) the development of siliceous reservoir in this area is obviously controlled by fault, which is the result of the reconstruction of limestone by deep hydrothermal solution along the fault. The siliceous reservoir and its hydrothermal solution system are located near the fault. In addition to the above three reservoir types, the Ordovician on the northern slope of Tazhong also developed reef and beach reservoirs on the terrace margin.
【作者單位】: 成都理工大學能源學院;成都理工大學沉積地質研究院;
【基金】:中國石化西北油田分公司科研項目“塔中北坡奧陶系儲層成因及發(fā)育模式研究”(編號:34400000-14-ZC0607-0031)
【分類號】:P618.13
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