四川盆地志留系龙马溪组优质页岩储层特征与开发评价

发布时间：2018-04-08 11:26

本文选题：四川盆地　切入点：优质页岩　出处：《天然气地球科学》2017年09期

【摘要】：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。
[Abstract]:With the construction of the national shale gas demonstration zone, China has entered the stage of large-scale development of shale gas; by December 2016, Changning-Weiyuan,In Zhaotong and Fuling National Shale Gas demonstration areas, the annual gas production is 79 脳 10 ~ (8) m ~ (3), and by 2030 the planned annual output of shale gas reaches to 800 ~ (1 000) 脳 10 ~ (8) m ~ (3), showing a good prospect of development.The formation thickness of Longmaxi formation in Sichuan Basin is about 300m. It is the primary task of the development stage to further identify the high-quality shale formation and evaluate the characteristics of the high-quality shale reservoir.According to the characteristics of graptolite belt and the evolution of sedimentary facies, Longmaxi formation is divided into two formations, Long-1 and Long-2, and the early Silurian deep-water shelf sedimentary environment controls the spatial distribution of high-quality shale.The core observation shows that black carbonaceous shale and siliceous shale are favorable lithofacies for the development of high quality shale at the bottom of Longyi member. The high quality shale has the characteristics of high organic carbon content, high brittle mineral content and high gas content.The geological reserve abundance of high quality shale segment is concentrated, and the average reserve abundance reaches 1.85 脳 10 ~ 8 m ~ (-1) ~ 3 / km ~ (-2), which is a favorable horizon for large-scale development of shale gas.
【作者单位】：中国石油勘探开发研究院;中国石油浙江油田公司勘探开发研究院;
【基金】：国家科技重大专项“大型油气田及煤层气开发”(编号:2016ZX05062002;2016ZX05015) 中国石油天然气股份有限公司科学研究与技术开发项目“页岩气钻采工程现场试验”(编号:2014F-4701-03)联合资助
【分类号】：P618.13;TE37

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