四川盆地陆相致密砂岩气勘探潜力与发展方向

Exploration potential and development direction of continental tight sandstone gas in the Sichuan Basin

为了明确四川盆地陆相致密砂岩气(以下简称致密气)的勘探开发潜力以及下一步的发展方向,基于丰富的勘探开发资料,系统开展了该盆地陆相致密砂岩含油气地质条件研究。研究结果表明:①四川盆地致密气主要分布在侏罗系沙溪庙组和上三叠统须家河组,具有烃源条件优、储层分布广、通源断裂发育、古今构造有利、埋藏深度浅、纵向多层含气、天然气品质优等特点;②优选出了川中核心建产区,川西北、川西南加快评价区和川东、川南接替评价区等5个有利区带,有利区可工作面积达7.2×10^(4)km^(2)、致密气地质资源量达6.9×10^(12)m^(3),为四川盆地致密气规模增储上产奠定了坚实的资源基础;③通过近几年的快速发展,在地质工程一体化和勘探开发一体化思路的指导下,中国石油西南油气田公司(以下简称西南油气田)形成了地质评价、钻完井、储层改造、高产井培育等较为成熟、可以复制的致密气勘探开发主体技术,为四川盆地致密气增储上产提供了技术保障。结论认为,四川盆地陆相致密气已经迎来了加快发展的新时期,“十四五”期间西南油气田将新增致密气储量1×10^(12)m^(3)、建成致密气年生产能力100×10^(8)m^(3),可以为提高天然气自给能力、保障国家能源安全、实现“碳达峰碳中和”目标贡献一份石油力量。

To figure out the exploration and development potential of continental tight sandstone gas(hereinafter referred to as tight gas)in the Sichuan Basin and point out its following development direction,this paper systematically studies the petroleum geological conditions of continental tight sandstone in the Sichuan Basin based on abundant exploration and development data.And the following research results are obtained.First,tight gas in the Sichuan Basin is mainly distributed in the Jurassic Shaximiao Formation and the Upper Triassic Xujiahe Formation,which have the advantages of favorable source conditions,wide reservoirs,developed source connecting faults,favorable ancient and current structures,shallow burial depth,multiple gas bearing layers vertically and quality natural gas.Second,five favorable areas are selected,including the central Sichuan core productivity construction area,the northwest Sichuan high-speed evaluation area,the southwest Sichuan high-speed evaluation area,the east Sichuan replacement evaluation area and the south Sichuan replacement evaluation area,and their workable area is 7.2×10^(4) km^(2) and geological resource of tight gas is 6.9×10^(12) m^(3),which lays a solid resource basis for scale reserve and production increase of tight gas in the Sichuan Basin.Third,after rapid development in recent years,Petro-China Southwest Oil&Gasfield Company has formed mature and duplicable main tight gas exploration and development technologies in geological evaluation,drilling and completion,reservoir reconstruction and high-yield well cultivation following the idea of geology-engineering integration and exploration-development integration,which provide technical guarantee for the reserve and production increase of tight gas in the Sichuan Basin.In conclusion,the continental tight gas in the Sichuan Basin has stepped into a new era of rapid development.During the 14^(th) Five-Year Plan,the reserve of tight gas will be increased by 1×10^(12) m^(3) and the yearly production capacity of tight gas of 100×10^(8) m^(3) will be constructed in Southwest Oil&Gasfield,which can make a contribution in petroleum power to improve the self-supporting capacity of natural gas,ensure the national energy security and realize the goal of"carbon peak and carbon neutrality".