川西坳陷回龙构造雷口坡组天然气成藏条件
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摘要
以区域地质研究为基础,通过三维地震解释并利用有机地球化学分析等技术手段,综合分析了川西坳陷回龙构造雷口坡组天然气成藏条件及其勘探潜力。结果表明,回龙地区海相烃源岩发育,纵向上沟通雷口坡组和下伏二叠系海相层系的烃源断裂及横向上雷口坡组顶部不整合面可作为油气的良好运移疏导体系,天然气成藏具有"双源供烃"的良好气源条件,且雷口坡组优质储层发育,并具有良好的生储盖组合。回龙构造圈闭类型好、断鼻圈闭面积大,且雷口坡组顶面岩溶缝洞发育区域与高部位相叠合。该区的研究及突破对于扩大川西整个雷口坡组的勘探范围和勘探领域具有重要意义,是下一步部署风险探井的有利目标区域。
On the basis of regional petroleum geology studies,by 3D seismic interpretation and organic geochemical analysis etc.,we comprehensively analyzed the natural gas accumulation conditions in the Leikoupo Formation of the Huilong structure,Western Sichuan Depression. The study result shows that marine source rocks are well-developed in the Huilong area; the hydrocarbon-source faults that vertically connect the Leikoupo Formation and underlying Permian marine formations and the unconformity surface at the Leikoupo Formation top in lateral direction can act as fine hydrocarbon migration and conduction systems; natural gas accumulation has fine gas source condition with"two hydrocarbon supplies"; the Leikoupo Formation has high-quality reservoirs and fine source-reservoir-caprock assemblage. The Huilong structure has ideal trap type,with big fault nose trap area. Moreover,the karst fracture-cave developed region at the Leikoupo Formation top is just at the high position. The study and breakthrough in this area is of great significance for expanding exploration scope and exploration domain of the Leikoupo Formation in the whole Western Sichuan Depression,and it is the favorable target for deploying risk prospect wells in the future.
On the basis of regional petroleum geology studies,by 3D seismic interpretation and organic geochemical analysis etc.,we comprehensively analyzed the natural gas accumulation conditions in the Leikoupo Formation of the Huilong structure,Western Sichuan Depression. The study result shows that marine source rocks are well-developed in the Huilong area; the hydrocarbon-source faults that vertically connect the Leikoupo Formation and underlying Permian marine formations and the unconformity surface at the Leikoupo Formation top in lateral direction can act as fine hydrocarbon migration and conduction systems; natural gas accumulation has fine gas source condition with"two hydrocarbon supplies"; the Leikoupo Formation has high-quality reservoirs and fine source-reservoir-caprock assemblage. The Huilong structure has ideal trap type,with big fault nose trap area. Moreover,the karst fracture-cave developed region at the Leikoupo Formation top is just at the high position. The study and breakthrough in this area is of great significance for expanding exploration scope and exploration domain of the Leikoupo Formation in the whole Western Sichuan Depression,and it is the favorable target for deploying risk prospect wells in the future.
引文
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[10]杨克明.四川盆地西部中三叠统雷口坡组烃源岩生烃潜力分析[J].石油实验地质,2016,38(3):366-374.
[11]谢刚平.川西坳陷中三叠统雷口坡组四段气藏气源分析[J].石油实验地质,2015,37(4):418-422.
[12]胡烨,陈迎宾,王彦青,等.川西大邑构造须家河组应力场数值模拟[J].地质科技情报,2015,34(2):92-97.
[13]陈迎宾,胡烨,王彦青,等.柴达木盆地鄂博梁Ⅲ号构造深层天然气成藏条件[J].油气地质与采收率,2015,22(5):34-39,63.
[2]黄士鹏,廖凤蓉,吴小奇,等.四川盆地含硫化氢气藏分布特征及硫化氢成因探讨[J].天然气地球科学,2010,21(5):705-714.
[3]陈迎宾,胡烨,王彦青,等.大邑构造雷口坡组四段天然气成藏条件[J].特种油气藏,2016,23(3):25-29.
[4]唐宇.川西地区雷口坡组沉积与其顶部风化壳储层特征[J].石油与天然气地质,2013,34(1):42-47.
[5]张劲超,赵晨露,杜浩坤,等.川西雷口坡组滩体沉积相研究[J].长江大学学报(自科版),2013,10(10):4-6.
[6]吕玉珍,倪超,张建勇,等.四川盆地中三叠统雷口坡组有利沉积相带及岩相古地理特征[J].海相油气地质,2013,18(1):26-32.
[7]廖凤蓉,吴小奇,黄士鹏,等.川西北地区中坝气田雷口坡组天然气地球化学特征及气源探讨[J].天然气地球科学,2013,24(1):108-115.
[8]许国明,宋晓波,王琼仙.川西坳陷中段三叠系雷口坡组—马鞍塘组油气地质条件及有利勘探目标分析[J].海相油气地质,2012,17(2):14-19.
[9]许国明,宋晓波,冯霞,等.川西地区中三叠统雷口坡组天然气勘探潜力[J].天然气工业,2013,33(8):8-14.
[10]杨克明.四川盆地西部中三叠统雷口坡组烃源岩生烃潜力分析[J].石油实验地质,2016,38(3):366-374.
[11]谢刚平.川西坳陷中三叠统雷口坡组四段气藏气源分析[J].石油实验地质,2015,37(4):418-422.
[12]胡烨,陈迎宾,王彦青,等.川西大邑构造须家河组应力场数值模拟[J].地质科技情报,2015,34(2):92-97.
[13]陈迎宾,胡烨,王彦青,等.柴达木盆地鄂博梁Ⅲ号构造深层天然气成藏条件[J].油气地质与采收率,2015,22(5):34-39,63.
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