A Brief Analysis on Forming Periods of Silurian Pools in the Tazhong A Well
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摘要: 塔中北斜坡Ａ井是塔里木盆地第一口在志留系发现工业油气流的探井。本文对塔中Ａ井志留系下砂岩段进行了详细的储层地球化学描述；根据有机包裹体的均一化温度，并结合塔中地区构造演化和热演化史，对塔中Ａ井志留系油气藏的成藏期进行了简要的分析。综合研究认为：塔中Ａ井志留系存在三期油气运移、聚集和两次油气破坏。三期油气运移聚集分别发生在志留纪－泥盆纪末、二叠纪末－三叠纪和喜山期。其中，第一次油气聚集规模大，在泥盆纪末，由于地层整体抬升遭到剥蚀，油气受氧化和生物降解等破坏作用，形成广泛分布的沥青砂；第二次油气运移聚集量较大，但在喜山期遭到不同程度的水淹。Abstract: The Tazhong A well is the first exploration well to find commercial oil in Silurian strata of theTarim basin. In the article a detaile reservoir geochemistry study was clone to the lower sandstone mem-ber in Silurian strata, so a biref conclusion was made on forming periods of the Silurian pool in theTazhong A well, according to the homogenization temperature of hydrocarbon inclusions and to the tec-tonic evolution and thermal evolution history. There were three periods for hydrocarbon smigration andaccu mu latio noccurred separately in the Silurian一Later Devonian, Inter Permian一Triassic and Hi-malayan period. The largest hydrocarbon accumulationoccurred in the first period, and the widely ds-tributed bitumen sandstone was formed in the end of Devoian, because of the hydrocarbon s oxidationand organism decomposition when whole strata were raised and eroded. The hydrocarbon accumuiatingscale was larger in the second period and there was water washing to a certain degree during the Hi-malayan movement.
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[1] 1 储同庆等.胜利油田义东礁丘相碳酸盐岩矿物包裹体的研究.石油勘探与开发.1991,(18)5.
2 戴世昭.江继纲等.江汉盆地马工庙地区石油运移的探讨.石油学报.1992.(13) 4. -
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