Hydrate logging curve stratification method in Muli area
XU Wei1, 2, LIN Zhen-Zhou2, 3, PAN He-Ping2, QIN Zhen2, DENG Cheng-Xiang2, QIN Rui-Dong2, JI Yang2
1.Shandong Zhengyuan Construction Engineering Co.Ltd,Ji'nan 250101,China; 2. Institute of Geophysics and Geomatics,China University of Geosciences (Wuhan),Wuhan 430074,China; 3. Institute of Geophysical and Geochemical Exploration,CAGS,Langfang 065000,China
Abstract：The Qilian Mountain is the first area of finding natural gas hydrate in the middle latitudes of the earth. The logging curve stratification is the first important work of logging interpretation, which is of great significance for the evaluation of gas hydrate logging. So far, natural gas hydrate has been found in many wells of scientific experimental drilling in the Muli area. Based on the logging data of the hydrate drilling wells in the Muli area, the authors used the activity method, the extreme variance method and the Walsh transformation method for automatic stratification. According to the basic principle of automatic stratification, different parameters were used for automatic stratification. A comparative study shows that the stratification effect of the activity method is the best, the stratified effect of the extreme variance method is poor, and the Walsh transform method has the worst stratification effect. The stratification results of the activity method are in good agreement with the lithologic data, thus laying the foundation for the lithologic identification and logging evaluation.
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