鄂尔多斯盆地大牛地气田中奥陶统马家沟组裂缝特征及成因
Shiyou shiyan dizhi(2022)
Abstract
鄂尔多斯盆地大牛地气田天然气潜力巨大,但中奥陶统马家沟组风化壳岩溶储层发育多种裂缝,成因复杂.为探明该储层裂缝特征,应用岩石学和测井技术,从裂缝发育频率、有效性、期次、赋存层位、形态、倾角等方面,比较了陡坎成因裂缝与构造裂缝的差异性;并通过弹性理论和断裂力学理论分析了裂缝端部区域的应力分量,探讨了陡坎裂缝的成因.陡坎成因裂缝以垂直缝、高角度斜交缝为主;裂缝延展方向和裂缝形态不规则,裂缝面不平整,具有上宽下窄、尾端无分叉特征;缝间有溶蚀现象,裂缝呈未—半充填状态,裂缝有效性高.陡坎成因裂缝受控于古地貌陡坡地形的坡度、岩层倾角、初始裂缝密度及岩石力学性质等因素;与构造裂缝相比,陡坎成因裂缝更有利于油气的运移.研究陡坎成因裂缝特征及成因,有助于进一步认识风化壳岩溶储层的展布规律,落实大牛地气田下一步勘探开发有利区.
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Key words
steep ridge fracture,fracture origin,majiagou formation,middle ordovician,daniudi gas field,ordos basin
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