涠西南凹陷页岩油碳同位素录井特征分析  

Analysis of carbon isotope logging characteristics of shale oil in Weixinan Sag

作　　者：郝为 耿恒 王瑞科 李行 瞿煜扬 HAO Wei;GENG Heng;WANG Ruike;LI Hang;QU Yuyang(China France Bohai Geoservices Co.,Ltd.,Tianjin 300450,China;Suzhou Grand Energy Technology Co.,Ltd.,Suzhou,Jiangsu 215129,China)

机构地区：[1]中法渤海地质服务有限公司,天津市300450 [2]苏州冠德能源科技有限公司

出　　处：《录井工程》2024年第4期32-38,共7页Mud Logging Engineering

摘　　要：随着录井技术的发展,碳同位素录井已经成为油气勘探常用的手段之一。围绕涠西南凹陷页岩油区开展的碳同位素录井工作,旨在有效评估不同层位页岩油气的成熟度及成因。采用碳同位素录井获取钻井液气的同位素组成,结合不同构造位置的探井特征进行对比分析,同时通过监测岩屑罐顶气的同位素分馏特征和岩屑放气量变化,评估页岩的孔隙发育程度及其含油气特征。研究发现涠西南凹陷油页岩夹层和互层段碳同位素偏重,分析认为是由于深部高演化油页岩生烃产物的充注导致,进而明确了北部湾盆地涠西南凹陷页岩油的有利储集层位,为后续油气勘探的部署提供了指导。As mud logging technology advances,carbon isotope logging has emerged as a prevalent technique in oil and gas exploration.The carbon isotope logging carried out around the shale oil zone in Weixinan Sag aims to effectively assess the maturity and origin of shale oil and gas in different horizons.Carbon isotope logging is used to obtain the isotopic composition of drilling fluid gas,and the carbon isotope logging characteristics from exploration wells at diverse structural positions are compared and analyzed.Meanwhile,by monitoring the isotopic fractionation characteristics of the cuttings headspace gas and volume changes in gas released from cuttings,the pore abundance and the characteristics of oil-gas potential for the shale are assessed.The carbon isotopes being a heavy trend within intercalated beds and interbeds for the oil shale in Weixinan Sag could be attributed to the charging of hydrocarbon generation products from deeply buried and highly evolved oil shale.The above results have identified the favorable reservoir horizons for oil and gas in Weixinan of Beibu Bay Basin,providing practical guidance for the deployment of follow-up oil and gas exploration.

关 键 词：页岩油 碳同位素录井 钻井液气 岩屑罐顶气 有利储层 

分 类 号：TE132.1[石油与天然气工程—油气勘探]