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CHARACTERISTICS AND EVALUATION OF C-10 RESERVOIR IN ZHIJING-ANSAI AREA, ORDOS BASIN |
YU Jian1, ZHANG Yan2, ZHAO Hui-tao3, YANG Xiao2, HOU Ying-dong3, LUO Shun-she4 |
1. Exploration Department of Changqing Oilfield Branch, CNPC, Xi'an 710018, China; 2. School of Geosciences, Yangtze University, Wuhan 430100, China; 3. Changqing Oilfield Exploration and Development Research Institute, CNPC, Xi'an 710021, China; 4. Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Wuhan 430100, China |
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Abstract The C-10 reservoir in Zhijing-Ansai area is analyzed with the data of core, rock thin section, casting thin section, mercury injection, SEM, X-ray diffraction and NMR. The results show that the lithology of C-10 reservoir is mainly arkose and lithic arkose, and the pore types are dominated by intergranular pores, feldspar dissolution pores and laumontite dissolution pores with good physical properties. The porosity and permeability are 11.4% and 2.35 mD respectively with strong heterogeneity. By studying the formation mechanism of physical differences between the east and west of the area, it is concluded that the reservoir physical property in the east is better than that in the west, mainly resulting from the good material foundation of the east and more acidic materials from C-9 source rocks, which promotes the development of dissolution pores. The Zhijing-Ansai area can be divided into 4 types of reservoir, among which the types I and II are mainly developed in the east, rare or undeveloped in the west. The type III is widely distributed, but poor in physical properties, while the type IV is mostly non-effective reservoir.
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Received: 03 September 2018
Published: 05 November 2019
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