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随着页岩气国家级示范区的建设,中国页岩气进入规模开发阶段;到2016年12月,长宁-威远、昭通和涪陵国家级页岩气示范区实现年产气量79×10~8 m~3,到2030年页岩气规划年产量达到(800~1 000)×10~8 m~3,展现出良好的发展前景。四川盆地龙马溪组地层厚达300m左右,进一步识别出优质页岩段,评价优质页岩储层特征是开发阶段的首要任务。依据笔石带特征和沉积相演化,将龙马溪组划分为龙一、龙二2个层段;志留纪早期深水陆棚沉积环境控制了优质页岩的空间分布,岩心观察识别出龙一段底部黑色炭质页岩和硅质页岩是优质页岩发育的有利岩相,优质页岩具有高有机碳含量、高脆性矿物含量、高含气量的特征;优质页岩段地质储量丰度集中,平均储量丰度达到1.85×10~8 m~3/km~2,是页岩气规模化开发的有利层位。
With the construction of the shale gas demonstration zone in China, the shale gas in China has entered into the scale development stage. By December 2016, the Changning-Weiyuan, Zhaotong and Fuling national shale gas demonstration zones have achieved annual gas production of 79 × 10 ~ 8 m ~ 3. By 2030, the annual production of shale gas will reach 800 ~ 1 000 × 10 ~ 8 m ~ 3, showing good prospects for development. The thickness of the Longmaxi Formation in the Sichuan Basin is about 300 m, further identifying high-quality shale sections and evaluating the features of high-quality shale reservoirs is the most important task in the development stage. Based on the lithofacies belt characteristics and the evolution of sedimentary facies, the Longmaxi Formation is divided into two layers, namely Long1 and Long2. The sedimentary environment of deep shelf in early Silurian controlled the spatial distribution of high quality shale. Bottom black carbonaceous shale and siliceous shale are favorable facies for the development of high-quality shales. High-quality shale has high organic carbon content, high brittleness mineral content and high gas content. , With an average abundance of 1.85 × 10 ~ 8 m ~ 3 / km ~ 2, which is a favorable horizon for shale gas development.