莺歌海盆地LD10区高含CO_(2)天然气充注期次精细厘定与成藏模式  

High CO_(2) Natural Gas Charging Events, Timing and Accumulation Pattern in LD10 Area of Yinggehai Basin

作　　者：姜平 何胜林 杨朝强 杨楷乐 王猛 兰张健 任双坡 张瑞雪 赵晓博 姚光庆[3,4] Jiang Ping;He Shenglin;Yang Zhaoqiang;Yang Kaile;Wang Meng;Lan Zhangjian;Ren Shuangpo;Zhang Ruixue;Zhao Xiaobo;Yao Guangqing(Zhanjiang Branch of CNOOC(China)Co.Ltd.,Zhanjiang 524057,China;Hainan Branch of CNOOC(China)Co.Ltd.,Haikou 570311,China;Key Laboratory of Tectonics and Petroleum Resource,Ministry of Education,China University of Geosciences,Wuhan 430074,China;School of Earth Resources,China University of Geosciences,Wuhan 430074,China;SINOPEC Jianghan Oilfield,Qianjiang 433124,China)

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057 [2]中海石油(中国)有限公司海南分公司,海南海口570311 [3]中国地质大学构造与油气资源教育部重点实验室,湖北武汉430074 [4]中国地质大学资源学院,湖北武汉430074 [5]中国石油化工股份有限公司江汉油田分公司,湖北潜江433124

出　　处：《地球科学》2022年第5期1569-1585,共17页Earth Science

基　　金：中海石油有限公司湛江分公司资助项目(No.CCL-2019-ZJFN0734)。

摘　　要：莺歌海盆地LD10区中深层黄流组-梅山组重力流水道、海底扇储层已被证实具有重大的天然气资源潜力.但是前期测试结果显示气藏中混有高含量CO_(2)气体.因此,精细厘定天然气充注期次,明确CH_(2)、CO_(2)等时空分布规律对规避高CO_(2)风险至关重要.本研究在对不同产状流体包裹体岩相学特征精细观察的基础上,综合激光拉曼光谱分析和包裹体显微测温技术识别出3幕不同成分天然气充注,时间分别为:4.0~2.9 Ma、2.0~1.2 Ma和0.8~0.3 Ma.其中,第一幕充注以烃类气为主,伴有少量有机CO_(2)和N_(2);第二幕和第三幕充注以大量无机CO_(2)、烃类气为主,伴有少量N2.结合天然气及烃源岩地化特征、天然气组分分析及输导体系识别,总结了LD10区的成藏模式,以期为研究区下一步天然气勘探开发和规避高含量CO_(2)风险提供依据.The gravity flow channel and subsea fan reservoirs of the middle and deep Huangliu Formation-Meishan Formation in Ledong 10 area of Yinggehai basin have been proved to have great natural gas resource potential. However, the preliminary test results show that the gas reservoir was mixed with high content of CO_(2) gas. Therefore, fine determination of natural gas charging periods and clear spatial and temporal distribution rules such as CH_(2) and CO_(2) are crucial to avoid high CO_(2) risks. In this study,based on the detailed observation of the petrographic characteristics of fluid inclusions with different occurrences, combined with laser Raman spectroscopy analysis and inclusions microscopic temperature measurement technology, three stages of natural gas charging with different components were identified at 4.0-2.9 Ma, 2.0-1.2 Ma and 0.8-0.3 Ma, respectively. Among them,the first stage of charging is mainly hydrocarbon gas, accompanied by a small amount of organic CO_(2) and N_(2). The second and third acts of charging were dominated by a large amount of inorganic CO_(2) and hydrocarbon gas, accompanied by a small amount of N2.Combined with the geochemical characteristics of natural gas and source rock, natural gas component analysis and transportation system identification, the accumulation model of Ledong 10 area is summarized, in order to provide a basis for the next gas exploration and development in the study area and to avoid the risk of high CO_(2) content.

关 键 词：包裹体显微测温 激光拉曼光谱 天然气充注期次 气藏成藏模式 LD10区 莺歌海盆地 油气地质 

分 类 号：P618.13[天文地球—矿床学]