广西地区重点区域页岩气资源潜力评价与产业化勘探开发路径OA

In recent years,stable shale gas flows have been obtained successively in the major basins(depressions)of the Guangxi Region,which confirms their great potential for shale gas resource exploration and development.However,the shale gas exploration and development in the Guangxi Region are still in the early stage,and the resource distribution remains unclear.The genetic models,distribution patterns,and effective reservoir-space types of dark(mud)shale are not determined,making it difficult to predict geological-engineering sweet spots.Based on the regional geological characteristics of the major basins(depressions)in the Guangxi Region,this paper systematically analyzes the geological conditions of shale gas resources,conducts resource evaluation by means of the conditional probability volumetric method,and subsequently proposes targeted suggestions for shale gas development.The following results are obtained.First,the Guizhong Depression is a marine mixed shale deposit system,characterized by great reservoir thickness,high organic matter abundance and thermal maturity,and diverse reservoir-space types,making it the most favorable area for shale gas accumulation.Second,the total geological resource of shale gas in the three major structural units—Guizhong Depression,Youjiang Depression,and Shiwandashan Basin—is estimated to be 9.93×1012 m3,with technically recoverable resource of 1.49×1012 m3.Third,three target areas for shale gas in the Guangxi Region are selected,i.e.,Luzhai,Rongshui,and western Huanjiang,with a total estimated geological resource of 6 985.03×108 m3 and technically recoverable resource of 1 025.26×108 m3.Fourth,it is recommended that shale gas development in the Guangxi Region proceed in three steps to gradually advance the exploration and development process.In conclusion,the research findings can provide guidance for future shale gas exploration and cost-effective development in the Guangxi Region,while contributing to the strategic goals of regional energy security.