准噶尔盆地腹部阜康深凹带侏罗系成藏规律

发布时间：2019-01-04 16:49

【摘要】：准噶尔盆地腹部阜康深凹带地层埋藏较深,断层不易识别,圈闭隐蔽,与凸起带以大型构造圈闭为主的油气藏在成藏规律上存在显著差异。在对阜康深凹带油气来源、运移通道、运移动力及成藏时间等成藏过程研究的基础上,分析油气运聚过程和成藏主控因素。首先应用地质与地球化学的分析方法,发现阜康深凹带的油气主要来自于八道湾组淡水环境下形成的煤系烃源岩;然后结合异常压力、运移输导特征及油气成藏期次的分析,认为油气从八道湾组排出之后,在八道湾组和三工河组砂体中发生过长距离侧向运移,之后通过走滑断层,垂向运移至上部的头屯河组圈闭中聚集成藏。通过对阜康深凹带成藏主控因素的分析,认为头屯河组油气藏的形成主要受超压、断裂、圈闭及三者良好匹配的控制,并在此基础上,建立了该区的油气成藏模式。
[Abstract]:The strata of the Fukang deep concave zone in Junggar basin are deep buried, the faults are difficult to identify, the traps are subtle, and there are significant differences between the reservoirs in the uplift zone and those in the uplift zone, which are dominated by large structural traps. Based on the study of oil and gas source, migration channel, migration dynamics and reservoir forming time in Fukang deep depression zone, the process of hydrocarbon migration and accumulation and the main controlling factors of oil and gas accumulation are analyzed. Firstly, by using geological and geochemical analysis methods, it is found that the oil and gas in Fukang deep depression mainly come from coal-measure source rocks formed in fresh water environment of Badaowan formation. Then according to the analysis of abnormal pressure, migration and migration characteristics and the times of oil and gas accumulation, it is concluded that after the oil and gas are expelled from Badaowan formation, long distance lateral migration occurs in the sand bodies of Badaowan formation and Sangonghe formation, and then through the strike-slip fault. Accumulation in the trap of the Toutunhe formation in the upper part of vertical migration. Based on the analysis of the main factors of reservoir formation in Fukang deep depression zone, it is considered that the formation of reservoirs in Toutunhe formation is mainly controlled by overpressure, fault, trap and good matching among them. On the basis of this, the oil and gas accumulation model in this area is established.
【作者单位】：中国石化胜利油田分公司勘探开发研究院西部分院;
【基金】：国家科技重大专项(2011ZX05022-002) 国家自然科学基金项目(41372129,41072096)联合资助
【分类号】：P618.13

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