低程度勘探区页岩气资源潜力评价研究--以四川广元地区邱家河组和龙马溪组为例

摘要

研究区位于龙门山西北段盆山结合部青川至广元一带,地质条件复杂,页岩气资源勘探程度低,对研究区古生界下寒武统邱家河组和下志留统龙马溪组页岩气资源潜量进行了分析和对比；研究基于野外地质调查、相关室内实验分析和页岩气资源潜量概率体积计算法。结果表明：(1)研究区地质条件总体对于页岩气富集成藏有利；(2)目的层页岩气资源潜量可观,分别为邱家河组62.06×108m3,龙马溪组17.05×108 m3；概率体积法对低勘探程度区域的页岩气资源潜量计算应用效果较好；(3)两套地层分别具有一定的页岩气勘探风险因素,研究区东南部为下一步有利勘探方向。%The research area is located in the northwest joint part of Longmenshan Mountain,where geological conditions are complex and the degree of shale gas exploration is low.The main purpose of this paper is to analyze and contrast shale gas potential in Qiujiahe Formation (C-1q)and Longmaxi Formation (S1ln).Main techniques include field investigation,laboratorial analysis and methodology of probability volume calculation.The results of the research indicate that (1 )For shale gas preservation,General geological conditions are relatively favorable for C-1 q and S1 ln.(2 )there is optimistic prospect for C-1 q and S1ln in research area,which are 62.06×108m3 (C-1q)and 17.05×108m3 (S1ln).Methodology of probability volume is effective in assessing shale gas potential;and (3)the two formations present objective and relative risks in shale gas generation and preservation respectively.The southeast part (Guangyuan and Sandui)of the research area is more favorable of shale gas exploration.