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| Exact identification approach to volcanics formation fluid based on fuzzy probability theory |
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ZHAI Ying hu1, LI Zu guang1, ZHANG Xu1, LI Ya2, MA Dong mei3, WANG Wen guang4
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(1. MOE Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing 102249, China;2. 2nd Logging Company, Daqing Exploratory Drilling Company, Songyuan 138003, China;3. Oil Production Technology Research Institute, Jilin Oilfield Company, PetroChina, Songyuan 138003, China;4. Oil & Gas Exploration and Development Corporation, PetroChina, Beijing 100034, China)
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| Abstract: |
| The interactivity and ambiguity of volcanic fluid were adequately considered. Based on fuzzy probability theory and log interpretation axiom, sampled data of volcanics were selected and cluster analyzed. A fuzzy probability function for fluid identification was established by using the conception of sum of squares of deviations. The probability density function and subordinate functions were established by using the theory of fuzzy mathematics and probability. And a mathematical model used for formation fluid identification in Songliao Basin by fuzzy probability was derived. The precision ratio of example identification is above 80％. The calculated results show that the approach is feasible and has popularization value. |
| Key words: fuzzy probability fluid identification Songliao Basin volcanics |
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