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| Dual laterolog resistivity correction method under the conditions of salt mud invasion for Mahe gas field |
| Zhang Chong1, Mao Zhi-qiang2, Sun Zhong-chun3, Zhang Jian3 |
1. Education Ministry Key Lab of Exploration Technologies for Oil and Gas Resources, Yangtze University, Jingzhou City, Hubei Province, 434023, china;
2. State Key Laboratory of Oil Resource and Prospecting, China University of Petroleum, Beijing City, 102249, china;
3. Xinjiang Oilfield Branch of CNPC, Xinjiang, 843000, China |
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Abstract The time-lapse dual laterolog response characteristics and laws for the formations with salt mud invasion in Mahe gas field were intensively analyzed in this paper. Based on testing and time-lapse logging data,the method of resistivity correction for formations with mud invasion was proposed by integrating time-lapse logging with the step model. Firstly the dual laterolog data for the testing intervals soaked for 5 days were corrected using the step model. Secondly,by taking oil-bearing properties,petophysics and Cmf/Cw into account,the statistical analysis of corrected resistivity and deep-laterolog resistivity of the drilled well,and the corresponding correction coefficients were determined. Finally,4 wells were corrected in Mahe Gas field. The results showed that water saturation calculated using resistivity corrected by this method perfectly matched that of pressure coring,so the feasibility of the method was proved. The gas saturation for the gas interval was increased by 13%,and gas saturation parameters were more accurate after salt mud invasion correction and the parameters could be used to calculate oil reserve.
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Received: 19 October 2009
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2010, Vol. 45 
