Well logging evaluation for shale oil is one of the difficulties in logging interpretation at present. Based on the accumulation characteristics of shale oil such as“self-generation and self-storage”and“high pressure for hydrocarbon generation”,as well as the macro phenomena of geological“sweet spots”such as the abnormal high pressure and active oil and gas display,authors analyze the essential characteristics of shale oil“sweet spots”and consider that the hydrocarbon movability is the most important characteristic of the geological“sweet spots”of shale oil in this study. The statistical results of the drilling,mud logging,well logging and oil testing data from hundreds of shale oil wells in Shengli Oilfield show that the geological“sweet spot”intervals have good physical properties,high formation pressure and high oil and gas charging, which make it easier to form obvious and stable low resistivity invasion profile near the borehole. Since the dual lateral logging is more effective to show the low invasion feature than the induction logging,the response relationship between the hydrocarbon movability of shale oil and well logging curves is established for the first time. Based on the amplitude difference of dual lateral logging,the quantitative evaluation coefficient of hydrocarbon mobility is proposed to evaluate the geological “sweet spots”of shale oil. The grading evaluation of geological“sweet spots”for several shale oil wells is conducted by this method,and the results match well with the lithofacies analysis and oil test results,which indicate a good application performance.
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JIANG Yunjian, LIU Huimin, CHAI Chunyan, XIN Zhongbin. Analysis of hydrocarbon movability logging response features of shale oil and its applications[J]. Petroleum Geology and Recovery Efficiency,2020,27(5):44~52