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和田河气田奥陶系碳酸盐岩中发育 3类成岩缝和 5期构造缝。裂缝以高角度小 微缝为主 ,多数裂缝被方解石和泥质充填或半充填。缝合线和 2 ,3 ,4,5期构造缝尚存在未被充填的空间 ,可作为油气的储集空间和渗流通道。裂缝是储层渗透率的主要贡献者 ,总渗透率的 99 4 为裂缝提供。裂缝的发育程度主要受控于构造运动和岩性 ,而与不整合面和地层负荷关系不大
There are three types of diagenetic joints and five structural joints in the Ordovician carbonate rocks in the Hetianhe gas field. The cracks are dominated by small micro-cracks at high angles, and most of the cracks are filled or semi-filled with calcite and clay. Suture and 2,3,4,5 construction joints still exist in the unfinished space, can be used as oil and gas reservoir space and seepage channels. Cracks are the major contributors to reservoir permeability, with 99% of the total permeability provided for the fracture. The degree of fracture development is mainly controlled by tectonic movement and lithology, but not with unconformity and formation load