姬塬油田长9油藏断层特征及对油藏的影响

摘要

Formation changes and structural mutation were found in part of adjacent wells in the production process of Chang 9 reservoir in Jiyuan Oilfield.By seismic interpretation,strata correlation and core observation,21 NWW normal faults developed in Jiyuan area were found.The time and space of Tianhuan Depression and hydrocarbon-generating peak of Chang 7 hydrocarbon-generating rocks are matched,which promotes the hydrocarbon lateral migration and accumulation,so the reservoir is relatively enriched in eastern part of the depression.The reservoir was readjusted after fault formation,which results in the destruction of reservoir below the faults.%姬塬油田长9油藏在生产过程中发现部分井地层厚度减薄,邻井构造突变。通过地震资料解释、地层对比、构造对比、岩心观察等发现姬塬地区发育21条北西西向正断层,弥补了该区块关于断层的证据。天环坳陷的形成与长7烃源岩分布及生烃高峰期在时空上匹配,促进了油气侧向运移并成藏,使凹陷东部油藏相对富集,断层形成后油藏重新调整,造成断层下方油藏被破坏。