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青西油田窿六区块下沟组属于低孔裂缝型油田藏,岩性复杂,砾岩、泥质白云岩是主要的裂缝发育岩性,储层测井评价难度大。通过分段后依据自然伽马,声波时差,补偿中子等曲线的交汇图版能识别储层岩性。在识别岩性的基础上,利用常规测井资料与FMI成像测井资料进行储层裂缝识别,分析天然裂缝发育段测井响应特征,研究裂缝与岩性的关系,裂缝产状,裂缝有效性等问题,研究表明,高产油层以发育高角度裂缝为主,其次是低角度裂缝、水平裂缝,准确识别岩性与裂缝是储层有效性评价以及准确判别流体性质的关键。
The Xiagou Formation belonging to the low porosity fractured oil reservoir in the Qingli Oilfield, with complex lithology, conglomerate and argillaceous dolomite, is the main lithology of fracture development. It is difficult to evaluate the well logging. The lithology of reservoirs can be identified by the intersection of curves of natural gamma ray, sonic time difference and compensated neutron after segmentation. Based on the identification of lithology, conventional well logging and FMI imaging logging data are used to identify reservoir fractures. The logging response characteristics of natural fractures are analyzed to study the relationship between fractures and lithology, the occurrence of fractures and the effectiveness of fractures The research shows that high oil fractured reservoirs are mainly developed high angle fractures, followed by low angle fractures and horizontal fractures. Accurately identifying lithology and fractures are the key points for evaluating reservoir effectiveness and accurately distinguishing fluid properties.