渝东南地区古生界天然气成藏体系及立体勘探
张培先 , 聂海宽 , 何希鹏 , 高玉巧 , 张志萍 , 周頔娜 , 云惠芳 , 周晨曦
地球科学 ›› 2023, Vol. 48 ›› Issue (01) : 206 -222.
渝东南地区古生界天然气成藏体系及立体勘探
Paleozoic Gas Accumulation System and Stereoscopic Exploration in Southeastern Chongqing
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渝东南地区处于四川盆地东南缘盆缘转换带,古生代地层发育齐全,但构造期次多、强度大,导致气藏类型多、成藏条件复杂.为明确气藏主要类型、成藏特征和立体勘探开发潜力,降低勘探风险和成本、提高勘探成功率,以成藏体系和立体勘探思路为指导,通过沉积相、地化指标、储集类型、成藏条件、源储匹配关系和成藏模式等研究,结合勘探开发实践,识别出源内和源外两类成藏体系,前者包括二叠系龙潭组泥页岩‒煤层气藏和茅口组泥灰岩气藏、奥陶系五峰组‒志留系龙马溪组页岩气藏和寒武系水井沱组页岩气藏,后者包括志留系小河坝组砂岩气藏、寒武系洗象池群和石龙洞组碳酸盐岩气藏.建议以源内成藏体系的下部五峰组‒龙马溪组页岩气为主、上部龙潭组和茅口组页岩气为辅开展立体勘探,同时探索源外砂岩和碳酸盐岩气藏,尽可能地发现多套商业含气层系,这对持续勘探突破具有重要的现实指导意义.综合研究源内、源外天然气成藏条件和富集规律,优选出盆缘南川地区为二叠系‒志留系‒寒武系立体勘探有利区带,盆外彭水地区为志留系‒寒武系立体勘探有利区带.
页岩气 / 立体勘探 / 成藏体系 / 古生界 / 渝东南 / 石油地质学
shale gas / stereoscopic exploration / accumulation system / Paleozoic / southeastern Chongqing / petroleum geology
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国家科技重大专项(2016ZX05061)
国家自然科学基金项目(41872124)
中国石化科技部项目(P21042-4;P20059-6)
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