柯坪地区中下寒武统走滑断裂带方解石脉期次、古流体演化与油气充注历史
刘建章 , 陈诚 , 蔡忠贤 , 李杰 , 吴正洲
地球科学 ›› 2023, Vol. 48 ›› Issue (06) : 2189 -2203.
柯坪地区中下寒武统走滑断裂带方解石脉期次、古流体演化与油气充注历史
Division of Calcite Veins Stage, Paleo-Fluid Evolution and Hydrocarbon Charging History in the Middle and Lower Cambrin Strike-Slip Fault Zone in Keping Area, Northwest of Tarim Basin
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新疆柯坪地区野外露头中下寒武统走滑断裂带充填多期方解石脉和固体沥青,是揭示流体活动和油气成藏过程的重要媒介.在野外露头断裂带中方解石脉、沥青充填特征观察的基础上,利用岩石薄片、阴极发光、微区原位稀土元素、碳氧同位素及流体包裹体等测试技术,厘定方解石脉形成期次、成脉流体性质及来源,揭示成脉古流体演化及其与油气充注的耦合关系.结果表明,柯坪地区中下寒武统走滑断裂中发育4~5期方解石脉(C1、C2、C3、C4、C5);C1成脉流体为地层水,部分混合了上覆阿瓦塔格组地层卤水;C2、C3成脉流体主要为地层水与含烃热液流体的混合,但C3成脉温度稍低;C4成脉流体也主要为地层水,存在大气淡水的混合;C5成脉流体为地层水、含烃流体和大气淡水的混合.5期方解石脉分别形成于加里东中晚期、海西中晚期、印支-燕山中期、燕山晚期和喜马拉雅期,3期油气充注于海西中晚期、印支-燕山中期和喜马拉雅期.海西中晚期、印支-燕山中期可能是柯坪地区中下寒武统原生油气藏的主要形成时期,喜马拉雅期是原生油气藏破坏、调整和再聚集期.喜马拉雅期定型、与走滑断裂相关圈闭也具有优越成藏条件.
油气充注 / 古流体演化 / 方解石脉 / 走滑断裂带 / 柯坪地区 / 石油地质
hydrocarbon charging history / paleo-fluid evolution / calcite vein / strike-slip fault zone / Keping area / petroleum geology
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国家重点研发计划课题(2019YFC0605502)
国家自然科学基金(42072179)
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