川中古隆起下古生界——震旦系勘探发现与天然气富集规律  

Discovery from Exploration of Lower Paleozoic-Sinian System in Central Sichuan Palaeo-uplift and Its Natural Gas Abundance Law

作　　者：罗冰[1] 周刚[1] 罗文军[1] 夏茂龙[1] 

机构地区：[1]中国石油西南油气田公司勘探开发研究院

出　　处：《中国石油勘探》2015年第2期18-29,共12页China Petroleum Exploration

基　　金：国家科技重大专项"四川盆地海相碳酸盐岩油气资源潜力;有利勘探区带评价与目标优选研究"(2011ZX 05004-005);中国石油天然气股份有限公司重大勘探专项"四川盆地乐山-龙女寺古隆起震旦系含油气评价及勘探配套技术研究"(2012ZD01)

摘　　要：近期川中古隆起震旦系灯影组、寒武系龙王庙组的天然气勘探获得重大新突破,古隆起东段发现了一个纵向3套产层、平面连片叠置的特大型气田。已探明龙王庙组天然气储量超过4400×108m3,控制灯四段气藏含气区面积7500km2。研究认为:川中古隆起特大型气田具有产层年代老、埋藏深度大、含气层系多、气藏类型多、规模大等特征,其形成得益于多套广覆式优质烃源岩与大面积岩溶储层互层叠置、大型稳定古隆起存在、古今构造圈闭叠合,更为关键的是古隆起继承性发展与各成藏要素演化匹配。川中古隆起东段高部位是天然气富集有利区,其中,高石梯—磨溪西部南北向带状区为灯影组天然气富集高产区,磨溪—龙女寺古、今构造叠合区为龙王庙组天然气富集高产区。Fresh breakthrough has been recently made in natural gas exploration of Sinian Dengying Formation and Cambrian Longwangmiao Formation in central Sichuan palaeo-uplift. A giant gas field, with three vertically-distributed producing layers, was found in the eastern segment of the palaeo-uplift. The proven natural gas reserve of Longwangmiao Formation exceeds 4400×108m3 while the controlled gasbearing area of the 4th member of Dengying Formation is 7500 km2. The study indicates that the giant gas field of central Sichuan palaeouplift is characterized in aged production layers, large buried depth, a multiple of gas horizons, a multiple of gas reservoir types and large scale. A number of factors helped development of this gas field, such as superimposition of extensive high-quality source rock and largearea karst reservoirs, existence of large-scale stable palaeo-uplift, and composition of ancient and modern structural traps. The more crucial factor is that successive development of palaeo-uplift matches with various accumulation elements. The high position in the eastern segment of central Sichuan palaeo-uplift is the favorable zone for natural gas abundance, where the marginal area of the south-north ribbon-shaped zone from Gaoshiti to the western part of Moxi is the high-yield natural gas abundance zone of Dengying Formation. The composition area of Moxi-Longnvsi ancient and modern structures is the high-yield natural gas abundance zone of Longwangmiao Formation.

关 键 词：川中古隆起 下古生界—震旦系 勘探发现 特大型气田 富集规律 

分 类 号：P618.13[天文地球—矿床学]