Logging resistivity correction under the strong extrusion stress condition in the Kuqa Foreland Basin
Yuan Long1, Zhang Haining1, Li Guoli1, Han Chuang2, Zhang Wen3, Wang Qian1
1. Logging Application Research Institute, Logging Corporation, CNPC, Xi'an, Shaanxi 710021, China; 2. Research Institute of Petroleum Exploration and Development, Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China; 3. Engineering Technology Research Institute of PetroChina Southwest Oil & Gasfield Company, Guanghan, Sichuan 618300, China
Abstract：The crustal stress in the Kuqa Foreland Basin often causes an abnormal increase of formation resistivity due to high-pressure and strong-extrusion condition.Resistivity curves of water layers look like that of high-resistivity gas beds,which results in inaccurate identification of reservoir fluid pro-perty in the resistivity logging data interpretation.Therefore we propose in this paper a resistivity correction method for the influence of strong compressive stress condition.This resistivity correction method is tested on theoretical analysis and experimental data simulations.The saturation comparison between the Function J calculation of mercury injection data and the corrected resistivity verifies the reliability of the resistivity correction method.The results show that the resistivity corrected by the proposed method reflects more authentically formation electrical characteristics,and further enhances the logging data interpretation of deep-fracture sandstone reservoirs in the study area.
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