塔里木盆地震旦系—寒武系万米超深层天然气成藏条件与有利区带优选

塔里木盆地超深层碳酸盐岩具有良好的油气勘探潜力，明确震旦系-寒武系万米超深层碳酸盐岩油气成藏条件及有利勘探区带分布规律对于开展塔里木盆地超深层油气勘探具有重要指导意义。塔里木盆地南华系-寒武系烃源岩发育，分布面积广；储层以礁滩相白云岩为主，中寒武统大面积发育的膏盐湖-膏/泥（云）坪沉积有利于油气保存及聚集，空间上构成多种有利的油气成藏生-储-盖组合。综合烃源岩、储层、有利盖层的分布规律，优选塔中隆起北斜坡与温宿凸起周缘的寒武系盐下台内滩、轮南低凸起-满加尔凹陷西部盐下礁后滩、轮南低凸起-古城低凸起台缘带及塔北隆起-满加尔凹陷西部-塔中隆起中寒武统盐间滩相储层分布区是塔里木盆地寒武系超深层有利勘探区带，其中埋深小于10 km的有利勘探面积达9.7×10⁴km²；塔北隆起南斜坡与塔中隆起北斜坡的台内滩储层分布区为震旦系超深层有利勘探区带，其中埋深小于10 km的有利勘探面积达3.1×10⁴km²。研究认识对于开展塔里木盆地震旦系-寒武系超深层天然气勘探具有重要理论和现实意义。

Accmulation conditions and favorable areas for natural gas accumulation in the 10 000 meters ultra-deep Sinian-Cambrian in Tarim Basin

As the ultra-deep carbonate rocks in Tarim Basin have good potential for oil and gas exploration, it is of great guiding significance to clarify the accumulation conditions of oil and gas and the distribution of favorable exploration areas in the Sinian-Cambrian carbonate rocks for ultra-deep oil and gas exploration in Tarim Basin. The Nanhuaian-Cambrian source rocks are well developed and widely distributed in Tarim Basin. The reservoirs are dominated by the dolomite of reef flat facies. A large scale of gypsum-salt lake deposition and gypsum/mud (cloud) flat deposition in Middle Cambrian is beneficial to the hydrocarbon preservation and accumulation, thus forming a variety of source-reservoir-cap combinations favorable for oil and gas accumulation. Based on the distribution pattern of source rocks, reservoirs and favorable caprocks, the Cambrian pre-salt platform shoal on the north slope of Tazhong uplift and the periphery of Wensu uplift, the pre-salt backreef shoal on the west of Lunnan low-uplift and Manjiar sag, the Middle Cambrian intersalt shoal facies reservoir in the platform margin belt of Lunnan uplift and Gucheng uplift, as well as in Tabei uplift, western Manjiar sag and Tazhong uplift are optimized to be the favorable exploration areas of the Cambrian ultra-deep formation in Tarim Basin. Of these, the favorable exploration areas below the burial depth of 10 km cover an area of 9.7×10⁴km²; the platform shoal on the south slope of Tabei uplift and the north slope of Tazhong uplift are the Sinian ultra-deep favorable exploration areas, of which the favorable exploration areas below the burial depth of 10 km cover an area of 3.1×10⁴km². In conclusion, this research is of great theoretical and practical significance for the Sinian-Cambrian ultra-deep natural gas exploration in Tarim Basin.