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《Journal of Changchun University of Science and Technology》 2002-04
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CHARACTERIZING FRACTURE INTENSITY OF IGNEOUS FORMATIONS BY FRACTAL DIMENSION OF RESIDUAL VARIATION OF LOGS

PAN Bao zhi 1,LI Zhou bo 1,SHI Yu tian 2 (1.College of Geo-Exploration Science and Technology,Jilin University, Changchun 130026,China;2.College of Geophysics and Information Technology, China University of Geoscience, Beijing 100083,China)  
The lithology of igneous rocks of Daqing area is so complicated that not only basic to acidic lavas were drilled, but also tuffs erupted in different times. The change of lithology is the main factor for the variation of various log responses. The log responses of fractures in the formations are usually glossed over by the lithology effect. The micro spheric focus log (MSFL), which has higher vertical resolution and is sensitive to the fractures in formation, is used to derive fractal dimension. In order to describe the fracture intensity quantitatively, it is necessary to take lithology into account when deriving fractal dimension from logs. After filtering and subtracting the filtered log from original one, the residual variation curve is obtained. The fractal dimension curve is derived from the residual variation curve to reduce the lithology effect, thus the fracture effect will be enhanced. The processing of real log data shows that the fractal dimension curve from residual variation indicates fracture intensity better than from the original logs.
【Fund】: 国家自然科学基金 (498894 190 - 4 );; 大庆石油管理局联合资助项目 ;; 国土资源部跨世纪人才资助项目(980 4 )
【CateGory Index】: P631.8
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