塔里木盆地麦盖提斜坡及周缘下古生界断-盖组合及其控油气作用

发布时间：2019-03-05 20:11

【摘要】：麦盖提斜坡是塔里木盆地重要的油气富集区带,石油地质条件优越。根据油气输导断裂与盖层时空匹配及油气分布之间的关系,采用叠合分析方法对麦盖提斜坡及周缘地区断-盖组合类型及对油气聚集与分布的控制作用进行了研究。结果表明,麦盖提斜坡及周缘地区断-盖组合主要有断穿错开型、断穿对接型和未穿型3种类型。断穿错开型组合断距大,盐层错开不对接,油气向上具有持续式运聚特征,运聚效率高,利于盐上油气富集;断穿对接型具有间歇式油气运聚特征,盐上、盐间、盐下均有可能存在油气富集;未穿型断-盖组合油气无法突破盐层向上运移,利于盐下油气聚集。不同的断-盖组合关系对油气勘探方向的选择具有重要的指导意义。
[Abstract]:Megheti slope is an important oil and gas enrichment zone in Tarim Basin, and the petroleum geological conditions are superior. Based on the relationship between oil-gas transport faults and space-time matching of caprock and distribution of oil and gas, the type of fault-cap assemblage and the control effect on oil and gas accumulation and distribution in Meghetti slope and peripheral area are studied by means of superposition analysis. The results show that there are three main types of fault-cap assemblages in the slope and peripheral area of Maccati, that is, fault-slip type, break-fit type and non-penetration type. The fault-and-dislocation-type combination has large fault distance, salt layer is not staggered, oil and gas migration and accumulation characteristics are sustained upward, and the migration and accumulation efficiency is high, which is beneficial to the accumulation of oil and gas on salt. The break-through type has the characteristics of intermittent migration and accumulation of oil and gas, in which oil and gas may be enriched in salt, inter-salt and under-salt, and oil and gas in non-perforated fault-cap assemblage can not break through the upward migration of salt layer, which is beneficial to oil and gas accumulation under salt. Different fault-cap assemblages have important guiding significance to the selection of oil and gas exploration direction.
【作者单位】：中国石油塔里木油田公司勘探开发研究院;浙江大学地球科学学院;
【基金】：国家重大科技专项“塔里木前陆盆地油气富集规律、勘探技术与区带和目标优选”(2011ZX05003-004)资助
【分类号】：P618.13

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