地质论评2017，Vol.63Issue(1)：153-164,12.DOI:10.16509/j.georeview.2017.01.014
川东南綦江丁山地区上奥陶统五峰组—下志留统龙马溪组页岩气地质条件综合评价
Comprehensive Evaluation on Geological Conditions of the Shale Gas in Upper Ordovician Wufeng Formation—Lower Silurian Longmaxi Formation in Dingshan Area, Qijiang, Southeastern Sichuan
摘要
Abstract
Objectives:Based on the analysis of shale gas-bearing of the Upper Ordovician Wufeng Formation and the Lower Silurian Longmaxi Formation in Well DY1,DY2 in Dingshan area,Qijiang County,Southeastern Sichuan Basin,the paper discusses the influences of various geological factors on the enrichment and productivity of shale gas reservoir.Methods:This paper carries out research with well and logging data comparison,seismic data interpretation and test data et al.Results:The shale gas geological conditions in Dingshan area are advantageous with high TOC,moderate thermal evolution degree,good reservoir properties and gas-bearing.Tectonic style is an important factor for controlling the shale gas enrichment,and positive structure is the most conducive type for the enrichment of shale gas in the Sichuan basin.The Dingshan structure is a nose-like faulted anticline which located in the edge of the Sichuan basin and adjacent to the Qiyueshan fault,it is also favorable for shale gas enrichment.And the Qiyueshan fault controls gas-bearing level in different locations of the Dingshan structure.Fractures are more developed in the locations with short distance to the Qiyueshan fault and shallow buried depth,the horizontal and vertical permeability of shale has obvious increased,shale gas is more prone to large-scale emissions,then finally resulting in poor gas-bearing of shale gas reservoir.Conclusions:Integrating with shale depth and structural feature,we divide the Dingshan structure into five zones as shallow buried gentle area,western slope area with high angle,middle fiat zone,eastern slope area with high angle and deep buried gentle area.Based on the thickness of high shale,and taking "structure and preservation condition" as the key with combination of shale depth,this paper chooses middle fiat zone as the most favorable for shale gas exploration in Dingshan Area.关键词
地质特征/页岩气逸散/富集因素/上奥陶统五峰组—下志留统龙马溪组/四川丁山地区Key words
geological characteristics/shale gas emission/enrichment factors/Wufeng Formation,Ordovician/Longmaxi Formation, Silurian/Dingshan area, Sichuan Basin引用本文复制引用
魏祥峰,赵正宝,王庆波,刘珠江,周敏,张晖..川东南綦江丁山地区上奥陶统五峰组—下志留统龙马溪组页岩气地质条件综合评价[J].地质论评,2017,63(1):153-164,12.基金项目
This study was financially supported by SINOPEC Ministry of Science and Technology (No:P15074) and China Geological Survey(No:12120115003901).本文为中国石油化工股份有限公司科技部基础研究项目“川渝地区海相优质页岩气层形成主控因素及预测技术”(编号:P15074)、中国地质调查局地质调查项目“川东页岩气基础地质调查”(编号:12120115003901)的成果. （No:P15074）
