四川盆地及周缘龙马溪组页岩产气效果影响因素

摘要

我国在四川盆地及周缘下志留统龙马溪组页岩气勘探开发中已取得一些重要发现和突破.JY1 HF井、 彭页1 Hf、DY2 HF井、 南页1 HF、 龙参2井、 保页1井等一系列针对龙马溪组的钻井及压裂改造都展现了我国南方龙马溪组页岩具备良好的勘探开发前景.本文对比分析了四川盆地及周缘多口页岩气井压后产量与储层地质条件、 储层物性、 地应力、 构造保存及压裂施工规模等影响页岩气产能参数的相关性,总结提出了影响页岩气勘探开发效果的主要控制因素为优质页岩厚度、 含气性、 脆性矿物含量、 孔隙度、 地层压力系数和水平应力差异系数,为今后我国南方海相页岩气的高效勘探开发提供了重要的借鉴和指导.%Many important findings and breakthroughs concerning the exploration and development of Lower Silurian Longmaxi shale gas in Sichuan basin and adjacent areas have been made. A series of drilling wells and fracturing reconstructions, such as Well JY1HF, Pengye1Hf, Well DY2HF, Nanye1HF, Well Longcan2 and Well Baoye1, all show a good prospect of Longmaxi shale gas in exploration and development. Correlational analysis were made between relevant parameters and post-fracture production in several shale gas wells in Sichuan Basin and adjacent areas, such as reservoir geological condition, reservoir physical property, in-situ stress, structure preservation, construction scale of fracturing and so on. It is concluded that the main controlling factors affecting the exploration and development of shale gas are thickness of high quality shales, gas-bearing properties, brittle mineral content, porosity, formation pressure coefficient and horizontal stress difference coefficient, which provides important reference and guidance for the efficient exploration and development of marine shale gas in the future.