Controls of Acid-sensitive Minerals on Reservoir Sensitivity Testing:
An Example from the Silurian Kepingtage Formation in
Tazhong Area, Tarim Basin |
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| Authors: | HAN Denglin WANG Qianqian WANG Chenchen OUYANG Chuanxiang and YUAN Wenfang |
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| Institution: | 1 Key Laboratory of Exploration Technologies for Oil and Gas Resources of the Ministry of Education, Yangtze University, Wuhan 430100, China
2 School of Geosciences, Yangtze University, Wuhan 430100, China,2 School of Geosciences, Yangtze University, Wuhan 430100, China,3 Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Wuhan 430100, China,4 School of Petroleum Engineering, Yangtze University, Wuhan 430100, China and 5 Research Institute of Exploration & Development, PetroChina Tarim Oilfield Company, Korla 841000, China |
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| Abstract: | The Silurian Kepingtage Formation in Tazhong area is regarded as an acid-sensitive hydrocarbon reservoir. However, formation mechanism of acid-sensitive of the reservoir cannot be interpreted by the existing acid-sensitive evaluation criterion based on damage rate. The contents of acid-sensitive minerals illustrated by bulk-rock XRD, scanning electron microscopy and clay mineral composition analysis exert the dominant control on acid-sensitive flow testing of the reservoir. The iron-bearing minerals (including pyrite cements and chlorite cements) mainly deteriorate reservoir quality, while the iron-free minerals (including calcite cements and dolomite cements) mainly improve permeability. The permeability variation of the tested samples is controlled by the relative content of two acid-sensitive minerals. On the basis of newly established sensitivity mechanism and its influence on permeability, the corresponding ion (Fe2+) stabilizer was added to the acidizing fluids during the acidification reconstruction, which inhibited the negative factors of acid-sensitive minerals and improved the target layer quality effectively. |
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| Keywords: | clay mineral acidic sensitivity effect Kepingtage Formation Tazhong area |
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