Accumulation of Upper Cambrian ancient reservoir in Wangcun, southern margin of middle Yangtze region
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摘要: 通过流体包裹体类型观察、均一温度测定,同时结合盆地模拟及原油裂解动力学计算,对中扬子区南缘永顺王村上寒武统古油藏进行了详细的解剖,认为加里东期,中扬子南缘地区普遍接受下寒武统烃源岩有效供烃,局部地区上震旦统烃源岩也形成有效供烃灶,研究区所在的斜坡为油气运移指向区,聚集形成原生油藏.早中三叠世,震旦系和中下寒武统中的原生油气藏在印支构造主幕下发生油气调整,王村古油藏就此形成.晚三叠世-早侏罗世,王村古油藏在挠曲构造或逆冲推覆体作用下被深埋,油气藏迅速发生原油裂解,原油裂解气型烃源灶接力供烃,彻底转变为气藏,同时也加速了油气散失的速度.后期在燕山Ⅱ幕强烈改造以及喜山运动的叠加改造下,古油气藏散失殆尽.Abstract: Based on microscopic observation and micro-thermometry measurement of fluid inclusions,combined with basin simulation and crude oil pyrolysis calculation,it is discussed in this paper the Upper Cambrian reservoir in Wangcun,the southern margin of the middle Yangtze region.During the Caledonian period,the southern margin of the middle Yangtze region accepted hydrocarbon from the Lower Cambrian source rocks.In some regions,the Upper Sinian source rocks also worked as effective hydrocarbon kitchens.Wangcun,located on the slope,was the destination of hydrocarbon migration,resulting in primary pool.During the Early and Middle Triassic,primary pools in Sinian and the Middle and Lower Cambrian adjusted due to the Indosinian Movement and the Wangcun ancient reservoir was formed.From the Late Triassic to the Early Jurassic,the Wangcun ancient reservoir was buried deep as the result of flexing or thrust-nappe effect.Crude oils cracked rapidly and oil-cracking-gas source kitchen supplied hydrocarbon in succession.The Wangcun reservoir transformed to gas pool completely,accelerating the dissipation rate of oil and gas.Due to the strong deformations during Yangshan and Himalayan stages,the ancient reservoir finally disappeared.
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