武陵山复杂构造区古生界海相油气实现重大突破

摘要

On the basis of an investigation of petroleum geological conditions of the residue syncline in Wuling Mountain complex structural belt and by contrasting main parameters of hydrocarbon reservoirs, the authors put forward the idea of paying special attention to evaluation of selected areas preserved by sedimentation and tectonics. The Anchang syncline favorable zone was chosen through optimization, and well Anye-1 was deployed. In this well, active oil and gas shows in Permian Qixia Formation have gas-bearing thickness up to 147 m. Multiple high pressure gas reservoirs were observed through drilling in Silurian Shiniulan Formation, and this was for the first time that high-yield gas flow was obtained in this formation in southern China. In addition, a small amount of heavy oil was observed. Nearly 20 m high gas-bearing carbonaceous shale was drilled in the Upper Ordovician Wufeng Formation–Lower Silurian Longmaxi Formation. It meets the shale gas standard for commercial development and further expands the range of commercial exploration of shale gas in southern China. In addition, high pressure gas reservoir was drilled in Ordovician Baota Formation which was also the first discovery.%在对武陵山复杂构造带主要残留向斜油气地质条件调查的基础上,通过油气成藏主要参数的对比,提出了注重沉积与构造保存的选区评价思路,优选了安场向斜有利区并布署实施安页1井钻探工程。该井二叠系栖霞组油气显示活跃,含气层厚147 m；在志留系石牛栏组钻遇多个高压气层,首次在南方该层系海相灰岩获得高产天然气流,并见到少量稠油；在上奥陶统五峰组—下志留统龙马溪组钻获高含气黑色页岩近20 m,达到了页岩气商业勘探的标准,进一步扩大了我国南方页岩气商业勘探范围；在奥陶系宝塔组钻遇高压气层,首次在南方该层系获得天然气发现。