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位于塔里木盆地古城地区的古城6井在下奥陶统白云岩中获得工业气流;该井气藏发育在致密灰岩之下,代表非常规储盖组合与油气成藏类型,其储层与天然气运聚机理研究对于勘探有利区带优选非常重要。通过对古城6井下奥陶统气藏储盖组合与油气运聚分析,提出古城6井下奥陶统白云岩储层形成于同生期白云岩化作用叠加埋藏期热液改造作用、气源通道为走滑断裂的认识,并建立了复式盖层与走滑断裂控储控藏模式:储层形成期热液流体沿走滑断裂侵入,遇复式盖层遮挡横向运移改造储层,成藏期天然气沿走滑断裂充注,受复式盖层遮挡成藏。通过对上奥陶统泥岩厚度统计、中奥陶统致密灰岩分布与走滑断裂带分布研究,认为满西低凸起与古城低凸起是中上奥陶统复式盖层与深大走滑断裂发育的有利区域;依据目的层埋深,提出满西低凸起北部与古城低凸起南部是下奥陶统白云岩勘探的有利区带。
The ancient city-6, located in the ancient city of Tarim Basin, obtained industrial gas flow in the Lower Ordovician dolomite. The well developed under tight limestone, representing unconventional reservoir-cap assemblage and hydrocarbon accumulation types. Its reservoir and natural gas transportation Polymechanism research is very important for the exploration of favorable zones. Based on the analysis of reservoir-caprock assemblage and hydrocarbon migration and accumulation in the Lower Ordovician gas reservoir in the ancient city 6, it is proposed that the Lower Ordovician dolomite reservoir in the ancient city 6 is formed during dolomitization over the same period and overlying the hydrothermal reformation, For the understanding of strike-slip faults, and the establishment of multi-caprock and strike-slip fault control reservoir and storage model: the formation of hydrothermal fluids along the strike-slip fault intrusion, metamorphic horizontal reservoir block transboundary reservoir reconstruction, accumulation Period of natural gas along the strike slippery fracture charge, covered by the compound cap reservoir. Based on the statistics of the Upper Ordovician mudstone thickness, the distribution of the Central Ordovician tight limestone and the distribution of strike-slip fault zones, it is concluded that the Manchu low relief and the ancient city low relief are the Middle-Upper Ordovician double-caprock and the deep According to the buried depth of the target layer, it is proposed that the northern part of the Manxun low convex and the southern part of the low convex in the ancient city are the favorable zones for exploration of the Lower Ordovician dolomite.