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利用构造应力场的研究结果,结合岩心薄片观测和测井解释资料,本文对下寺湾油田柳洛峪区长8油层组裂缝特征进行了综合研究。结果表明:研究区长8储层微裂缝以构造缝为主,占微裂缝总数的70%;大部分为全充填缝(即闭合缝);充填物成分主要为泥质,少数为方解石和铁质及其它充填物;压裂施工过程中当油井不存在过井天然缝时,压裂过程中破压明显,产生新人工缝。当存在过井天然缝时,压裂过程中破压不明显,人工缝沿天然裂缝延伸。长8层的裂缝方位与构造最大主应力方向一致,均为为北偏东70°左右。
Based on the research results of tectonic stress field and the observation of core thin slices and logging interpretation data, this paper comprehensively studied the fracture characteristics of Chang 8 reservoir in Liuluoyu area of Xiaansiwan oil field. The results show that the fractures of Chang 8 reservoir in the study area are dominated by structural seams, accounting for 70% of the total number of micro-fractures; most of them are fully filled seams (ie, closed seams); the filling components are mainly muddy with a few of calcite and iron Quality and other filling; fracturing construction process when there is no natural well over the well when fracturing pressure was obvious during the process, resulting in a new artificial joints. When there is a natural well over the well, the fracturing pressure is not obvious, and the artificial fissure extends along the natural fissure. The fracture orientation of the 8th layer coincides with the direction of the maximum principal stress of the structure, both of which are about 70 ° east to north.