Theory and practice of unconventional gas exploration in carrier beds: Insight from the breakthrough of new type of shale gas and tight gas in Sichuan Basin, SW China

作     者：GUO Tonglou XIONG Liang YE Sujuan DONG Xiaoxia WEI Limin YANG Yingtao 

作者机构：Sinopec Southwest Oil&Gas CompanyChengdu 610041China 

出 版 物：《Petroleum Exploration and Development》 (石油勘探与开发（英文版）)

年 卷 期：2023年第50卷第1期

页      面：27-42页

核心收录：

学科分类：0820[工学-石油与天然气工程] 081803[工学-地质工程] 08[工学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 

基　　金：Sinopec Science and Technology Major Project (P22081) China National Science and Technology Major Project (2016ZX05002-004) 

主　　题：Sichuan Basin carrier bed tight gas shale gas silty shale Cambrian Qiongzhusi Formation Triassic Xujiahe Formation 

摘      要：Unconventional gas in the Sichuan Basin mainly includes shale gas and tight *** development of shale gas is mainly concentrated in the Ordovician Wufeng Formation-Silurian Longmaxi Formation,but has not made any significant breakthrough in the Cambrian Qiongzhusi Formation marine shale regardless of exploration efforts for *** commercial development of tight sandstone gas is mainly concentrated in the Jurassic Shaximiao Formation,but has not been realized in the widespread and thick Triassic Xujiahe *** on the geological characteristics of the Qiongzhusi Formation and Xujiahe Formation,the feedback of old wells was ***,combining with the accumulation mechanisms of con-ventional gas and shale gas,as well as the oil/gas shows during drilling,changes in production and pressure during develop-ment,and other characteristics,it was proposed to change the exploration and development strategy from source and reservoir exploration to carrier beds *** the combination of effective source rock,effective carrier beds and effective sand-stone or shale as the exploration target,a model of unconventional gas accumulation and enrichment in carrier beds was *** the guidance of this study,two significant results have been achieved in ***,great breakthrough was made in exploration of the silty shale with low organic matter abundance in the Qiongzhusi Formation,which breaks the traditional approach to prospect shale gas only in organic-rich black shales and realizes a breakthrough in new areas,new layers and new types of shale gas and a transformation of exploration and development of shale gas from single-layer system,Longmaxi For-mation,to multi-layer system in the Sichuan ***,exploration breakthrough and high-efficient development were re-alized for difficult-to-produce tight sandstone gas reserves in the Xujiahe Formation,which helps address the challenges of low production and unstable production of fractu