川东南五峰-龙马溪组页岩气勘探开发进展、主要问题及对策

Progress,main problems and countermeasures of the shale gas exploration and development in Wufeng-Longmaxi formation,southeast Sichuan

川东南涪陵-南川-东溪-丁山地区的五峰-龙马溪组页岩气获得了较好的勘探开发效益,仅涪陵气田于2018年底累计探明储量就达6008×108m3,产气量累计超过150×108m3。如何有效圈定页岩气“甜点”区段、提高钻完井和压裂技术水平、确保环境不受污染与安全生产是目前川东南页岩气勘探开发事业中亟待解决的现实问题。本文建议积极探索页岩气勘探开发新领域,建立健全完善且具有针对性的页岩气“甜点”区段的评价标准与体系,寻求低成本设备与技术体系、作业模式,努力优化开采方案和增产作业措施,采用环保型压裂介质和废液生态处理方式,避免由于开采过程中地应力失衡而引发的次生地质灾害等方面的对策,以期能够对川东南五峰-龙马溪组页岩气的勘探开发提供参考与指导。

The shale gas of Wufeng-Longmaxi formation in Fuling-Nanchuan-Dongxi-Dingshan area of southeast Sichuan has achieved good exploration and development benefits.At the end of 2018,the proved reserves of shale gas in Fuling gas field reach 6 008×10 8 m 3,and the cumulative gas production exceeded 150×10 8 m 3.How to effectively delineate the “sweet spot” of shale gas,improve the drilling and completion of wells and fracturing technology,and ensure environmental protection and safe production are the realistic problems that need to be solved urgently in the exploration and development of shale gas of Wufeng-Longmaxi formation in southeast Sichuan.The authors suggest that we should actively explore the new field of shale gas exploration and development,establish and perfect the evaluation standard and system of the “sweet spot” of shale gas,seek low-cost equipment and technology system,operation mode,and strive to optimize mining scheme and increase production measures.We should also strive to optimize mining plans and increase production measures,adopt environmentally friendly fracturing media and waste liquid ecological treatment methods,and avoid secondary geological disasters caused by the imbalance of in-situ stress during mining.It is hoped that these countermeasures can provide references and guidances for the exploration and development of shale gas of Wufeng-Longmaxi formation in southeast Sichuan.