天然气勘探与开发2025，Vol.48Issue(2)：14-25,12.DOI:10.12055/gaskk.issn.1673-3177.2025.02.002
川西新场地区须家河组断缝体气藏低阻储层气水识别
Identifying gas and water in low-resistivity fractured-porous gas reservoirs of Xujiahe Formation,Xinchang area,western Sichuan Basin
摘要
Abstract
Fractured-porous gas reservoirs with low resistivity are extended in the second member of the Upper Triassic Xujiahe Formation(Xujiahe 2 Member),Xinchang area,western Sichuan Basin.They are characterized by tight lithology,strong heterogeneity,and complex gas-water relation,resulting in considerable uncertainty in identifying reservoir-fluid properties by using conventional logs or popular gas-water crossplots.Thus,the(T2-T1)two-dimensional nuclear magnetic resonance(NMR)logging crossplot was created for identifying gas and water after optimizing both design and gauge on the basis of one-dimensional NMR logging.Moreover,the identification for this sort of reservoirs was discussed in the light of principles of apparent porosity frequency spectrum dependent on electrical imaging logging.Results show that(i)fluid components possess unlike zoning characteristics in the two-dimensional identification crossplot from which movable gas and water components in such reservoirs can be identified actively;(ii)with high resolution and coverage around wells,the imaging logging is available for not only pore structure analysis but gas-water identification in the low-resistivity fractured-porous reservoirs;and(iii)it is assumed the evaluated low-resistivity reservoir as a gas layer,but not as a gas-water layer.The gas-water identification interpreted from this new technology has higher coincidence with that of gas testing from previous 80%to current 95%or so.关键词
气水识别/低阻裂缝—孔隙型储层/(T1-T2)二维核磁成像谱/新场地区/四川盆地Key words
Gas-water identification/Low-resistivity fractured-porous reservoir/(T2-T1)Two-dimensional NMR image spectrum/Xinchang area/Sichuan Basin引用本文复制引用
李阳兵,张正玉,吴晓光..川西新场地区须家河组断缝体气藏低阻储层气水识别[J].天然气勘探与开发,2025,48(2):14-25,12.基金项目
中石化石油工程技术服务股份有限公司科技攻关项目(编号:SG22-19K). （编号:SG22-19K）
