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《Chinese Journal of Geophysics》 2019-01
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Experimental studies and investigations on the dual lateral log response of near borehole fractures

GE XinMin;FAN YiRen;LI Jun;TAN BaoHai;WANG Lei;WU ZhenGuan;WANG XiaoChang;School of Geosciences,China University of Petroleum(East China);Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology;Exploration & Production Research Institute,SINOPEC;  
We developed a scaling-down proportional physical simulation on the near borehole fractures based on the numerical results to investigate the response characteristics of dual lateral log in fractured reservoirs,aiming to improve the precision of the fracture identification and parameter characterization.Based on the physical simulation platform,the bedrock was simulated with sodium chloride solution of different concentrations,and the high conductive fractures were simulated with galvanized sheets of different widths,to make the measurement process visible.The effects of the scales,fracture location,and occurrence of near borehole fractures on dual lateral resistivity are analyzed via comparative experiments.The results show that the fracturescale has little effect on the value of dual lateral resistivity,while has a direct relationship with the amplitude of dual lateral resistivity in the effective detection range of the instrument;the farther away from the borehole,the higher of the dual lateral resistivity.But the reduction extents of shallow and deep resistivity are different.The deep lateral resistivity is positively correlated with the fracture dip,but the shallow lateral resistivity does not change obviously.With the increase of the fracture dip,the difference between the deep and the shallow lateral resistivity transits from the negative value to the positive value,it is hard to observe the critical dip.The phenomenon indicates that it is necessary to pay special attention to the applicable conditions of the dual lateral log to judge the formation occurrence.
【Fund】: 国家自然科学基金“缝洞储集体双侧向测井响应的物理模拟及特征分析”(41404086);国家自然科学基金“缝洞储集体三维电阻率测井基础研究”(41474100);; 国家科技重大专项“海相碳酸盐岩油气井井筒关键技术”(2011ZX05005-006)联合资助
【CateGory Index】: P631.81
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