A quantitative approach for sealing capacity evaluation of caprock in candidate of aquifer gas storage

被引:2
作者
Jia, Shanpo [1 ,2 ]
Xu, Meng [1 ]
Wen, Caoxuan [1 ]
Li, Borui [1 ]
Liu, Tuanhui [3 ]
Xi, Zengqiang [3 ]
Han, Lin [4 ]
机构
[1] Northeast Petr Univ, Sch Earth Sci, Daqing 163318, Peoples R China
[2] China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China
[3] CNPC, Res Inst Huabei Oilfield Co, Explorat & Dev, Renqiu 062552, Hebei, Peoples R China
[4] China Petr Logging Co Ltd, Interpretat & Evaluat Ctr, Daqing Branch, Daqing 163412, Heilongjiang, Peoples R China
基金
中国国家自然科学基金;
关键词
Aquifer gas storage; Mudstone; Caprock; Sealing capacity; Evaluation model; RESEARCH PROGRESS; TECHNOLOGIES; BRITTLENESS; INTEGRATION; INTEGRITY; PRESSURE;
D O I
10.1007/s11356-023-26873-x
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The gas sealing capacity of caprock (SCC) is one of the key factors that determine whether aquifer trap can be constructed into underground gas storage (UGS). However, no standard protocol for evaluating SCC of candidate aquifers has been proposed. Based on the core observation, laboratory experiment, and well logging data, the sealing capacity of the target aquifer caprock of Permian mudstone in D5 block of Litan sag, China, is quantitatively evaluated. The important parameters of mineral brittleness, permeability, breakthrough pressure (BP), mechanical brittleness, thickness, and areal extent that affect the SCC are determined. The results of specific tests and data statistics show that the caprock of D5 block is a low permeability rock with a permeability of 10(-4) mD, and the BP of undisturbed rock is greater than 38 MPa. Although the brittle mineral quartz is abundant with an average of 38.38%, the mechanical brittleness is not strong under formation conditions. The direct caprock has a thickness of greater than 50 m, and on the top of it is a high-quality indirect caprock that complements the physical closure. The results of a mathematical evaluation model show that except for the sealing index of sample 2, all the other samples have optimal sealing capacity. The field interference test shows that the optimal sealing capacity of the caprock meets the requirements of the construction of underground gas storage (UGS). The rationality of the comprehensive evaluation model can provide a reference for similar evaluation projects in the future.
引用
收藏
页码:63678 / 63690
页数:13
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