四川盆地南部地区深层页岩气勘探开发新进展与挑战

Deep shale gas exploration and development in the southern Sichuan Basin:New progress and challenges

四川盆地海相页岩气资源丰富,经过10余年的勘探开发,四川盆地及其周缘地区已经建成了3个国家级页岩气示范区,目前已成功实现中深层(埋深小于3 500 m)页岩气的商业化、规模化开发。四川盆地南部地区(以下简称川南地区)上奥陶统五峰组—下志留统龙马溪组深层页岩气(埋深3 500~4 500 m)资源量6.6×10m^(3),勘探开发潜力巨大,是“十四五”我国页岩气规模上产的重要领域。川南地区深层页岩气埋藏深,受温度和压力高、应力与应力差大等复杂地质工程条件影响,要实现高质量发展,面临着诸多挑战。为此,在系统总结川南地区深层页岩气勘探开发新进展与成效的基础上,深入剖析了其目前面临的问题与挑战,并提出了下一步攻关方向。研究结果表明:(1)通过前期探索实践与自主创新,形成了以“五好”(选好区、定好井、钻好井、压好井、管好井)为核心的页岩气勘探开发关键技术,建立了高产井培育模式,支撑了川南地区深层页岩气的规模效益开发;(2)通过系统分析认为,深层页岩气勘探开发在基础理论、关键技术和管理模式“三大领域”仍面临着一系列挑战;(3)面对挑战,需深化勘探开发相关基础理论研究、持续完善关键主体技术、坚持创新机制体制与管理模式。结论认为,通过多年的持续攻关和先导试验,基本形成了与川南地区深层页岩气工况相适应的勘探开发主体技术,提交了首个深层页岩气万亿立方米储量,优选了首个深层页岩气百亿立方米上产区块,取得了深层页岩气勘探开发的重大进展,坚定了向深层页岩气勘探开发的信心和决心,对中国页岩气产业的快速发展具有重要的指导意义。

There are abundant marine shale gas resources in the sichuan Basin. after almost one decade of exploration and development, three national shale gas demonstration areas have been built in the sichuan Basin and its periphery, and large-scale commercial development of middle and deep(above 3 500 m in depth) shale gas has been successfully achieved. The volume of deep shale gas resources(3 500-4 500 m deep) of the upper Ordovician wufeng Formation-lower silurian longmaxi Formation in the southern sichuan Basin is 6.6×10m^(3), with huge exploration and exploitation potential, so it is an important area for large-scale shale gas production increase in china during the 14 th Five-year Plan. Deep shale gas in the southern sichuan Basin is influenced by complex geological engineering conditions, such as great burial depth, high temperature and pressure, and large stress and stress difference, and its high-quality development faces many challenges. after systematically summarizing the new progresses and achievements in deep shale gas exploration and development in the southern sichuan Basin, this paper analyzes the difficulties and challenges in deep shale gas exploration and development and puts forward the next research directions. and the following research results are obtained. First, based on early practical exploration and independent innovation, key shale gas exploration and development technologies with good area selection, good well deployment, good well drilling, good well killing and good well management as the core are formed, and the cultivation mode of high production well is established, which supports the large-scale benefit development of deep shale gas in the southern sichuan Basin. second, systematical analysis indicates that the exploration and development of deep shale gas still faces a series of challenges in such three major fields as basic theory, key technology and management mode. Third, in the face of challenges, it is necessary to deepen basic theory research related to exploration and development, continuously improve key main technologies and constantly innovate mechanisms, systems and management modes. in conclusion, after years of continuous researches and pilot tests, a series of main exploration and development technologies suitable for the working conditions of deep shale gas in the southern sichuan Basin have been basically formed, the first deep shale gas reserves of trillion cubic meters has been submitted, and the first deep shale gas production increase block of ten billion cubic meters has been selected. Thus, great progresses have been made in the exploration and development of deep shale gas, which confirms the confidence and determination in exploring and developing deep shale gas and is of great guiding significance to the rapid development of shale gas industry in china.