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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
Well A in the middle slope of Tarim Basin is the first exploration well to discover industrial oil and gas flow in Silurian in the Tarim Basin. Based on the homogenization temperature of organic inclusions and the tectonic evolution and thermal evolution history in the Tazhong area, It is a brief analysis of the hydrocarbon accumulation period. The comprehensive study shows that there are three phases of hydrocarbon migration, accumulation and two oil and gas damage in Silurian A well in Tazhong. The third phase of hydrocarbon migration and accumulation occurred at the end of Silurian-Devonian, Permian-Triassic and Himalayan respectively. Among them, the first large-scale oil and gas accumulation was large in scale. At the end of the Devonian, due to the overall uplift of the strata that was denuded, oil and gas were destroyed by oxidation and biodegradation, forming a wide distribution of tar sands. The second hydrocarbon migration and accumulation volume Large but flooded in varying degrees during the Himalayan period