摘要
中扬子地区古生界海相层系与上扬子地区具有相似的油气地质基本条件,但经历了长期、曲折的勘探历程,久攻未克。研究分析中扬子地区区域构造、沉积演化,烃源岩、储层沉积相带、成藏组合,认为中扬子地区发育以震旦系、寒武系为勘探主要目的层的下组合和以二叠系、三叠系为主的上组合两个含油气组合,具备发现常规天然气和页岩气的良好石油地质条件,资源潜力大,是寻找规模天然气的重点勘探潜力区。提出上组合有效勘探区域主要为鄂西渝东石柱复向斜、江汉平原区沉湖—土地堂复向斜、当阳复向斜和湘鄂西区的利川复向斜南部地区;下组合勘探以鄂西渝东石柱复向斜及湘鄂西区为有利分布区;湘鄂西区是寒武系牛蹄塘组页岩气勘探有利区,枝江—当阳区块为奥陶系五峰组—志留系龙马溪组页岩气勘探有利区。在勘探思路上,应坚持以构造演化及成藏演化为主线,以储层和保存评价为重点,常规油气与非常规油气并举,强化技术攻关,实现中扬子海相勘探的大突破。
The Paleozoic marine strata series in the middle Yangtze area is basically similar to that of the upper Yangtze area. However, no substantial results have been achieved over a long and tortuous exploration period. This paper studies and analyzes regional structures, sedimentary development, hydrocarbon source rock, reservoir sedimentation belts and reservoir-cap assemblages in the middle Yangtze area. It concludes that two main potential exploration targets exist in the middle Yangtze area – the lower one composed of Sinian System and Cambrian Systen and the upper one composed of Permian System and Triassic System. This area has the desirable petroleum geological conditions for discovery of conventional natural gas and shale gas with great resources potential. It is supposed to be a key potential area for natural gas exploration. It is proposed that the effective exploration areas of the upper target include Shizhu complex syncline located from West Hubei to East Chongqing, Tuditang and Dangyang synclinorium on Jianghan Plain, and the southern part of Lichuan synclinorium in West Hunan-Hubei area. The effective exploration areas of the lower target include Shizhu complex syncline from West Hubei to East Chongqing and favorable zones in West Hunan-Hubei area. The Cambrian Niutitang Formation in West Hunan-Hubei area is the favorable zone for shale gas exploration while the Jiangzhi-Dangyang block is the favorable zone for shale gas exploration of Ordovician Wufeng Formation – Silurian Longmaxi Formation. The exploration principles should be focused on structural development and accumulation process, highlighting evaluation of reservoirs and preservation, putting the same emphasis on both conventional and unconventional oil and gas, and strengthening technological research to make breakthroughs in marine exploration of the middle Yangtze area.
出处
《中国石油勘探》
CAS
北大核心
2015年第2期1-8,共8页
China Petroleum Exploration
关键词
中扬子地区
海相
天然气
台缘礁滩
岩溶
勘探方向
勘探对策
middle Yangtze area,marine,natural gas,platform marginal beach reef,exploration direction,exploration solution
