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根据库车坳陷西部地质剖面分析其构造圈闭类型,利用平衡剖面和生长地层分析构造圈闭形成期次。选取大北1井和一口人工井,应用PRA公司的BasinMod1-D软件,对其进行烃源岩成熟度史模拟,分析烃源岩的主要生烃期。根据构造圈闭形成期与烃源岩主要生烃期的匹配关系,认为西秋里塔格构造带盐下古构造圈闭与拜城凹陷烃源岩生烃期匹配良好,形成的油气藏大部分在后期保存良好,盐上圈闭可能形成油藏,盐层内部圈闭可能形成油藏、气藏或油气藏,在较厚盐层之下的圈闭可能会形成气藏。克拉苏构造带古构造圈闭与克拉苏构造带烃源岩主要生烃期以及拜城凹陷的主要生油期匹配良好,可以形成良好的油气藏,但是库车组沉积末期—第四纪构造破坏严重,油气藏经受构造调整、破坏和再分配形成残余油气藏、次生油气藏,此时正处于侏罗系烃源岩生气期,可以在盐下形成大量气藏。
Based on the analysis of structural traps in the western geological section of Kuqa Depression, the formation traps are constructed based on the balanced profile and the growth strata. The Dabei 1 well and one artificial well were selected and the PRA BasinMod1-D software was used to simulate the maturity of the source rocks and analyze the main hydrocarbon generation periods of the source rocks. According to the matching relationship between the tectonic traps and the main hydrocarbon generation period of source rocks, it is considered that the palaeotectonic traps in the Xiqiulitag tectonic belt are well matched with the hydrocarbon generation periods of the source rocks in the Baicheng Sag, and the majority of the formed reservoirs are in the Post-preservation is good, reservoirs may be formed by salt traps, reservoirs, reservoirs or reservoirs may form within the salt trap, and traps under thicker salt may form gas reservoirs. Palaeo-structural traps in the Kelassu tectonic belt are well matched with the main hydrocarbon generation periods of the source rocks of the Kelassu structural belt and the main oil-producing periods of the Baicheng sag, and can form good oil and gas reservoirs. However, in the late Quaternary structure Serious damage, reservoirs undergoing structural adjustment, destruction and redistribution to form residual reservoirs and secondary reservoirs. At this time, the reservoirs are in the gas generation period of Jurassic source rocks and a large number of gas reservoirs can be formed under salt.