珠江口盆地惠州凹陷惠东新区恩平组烃源岩生烃特征及成藏贡献  

Hydrocarbon generation characteristics and reservoir forming contribution of Enping Formation source rocks in Huidong new area,Huizhou sag,Pearl River Mouth basin

作　　者：刘培 彭光荣 熊万林 杨兴业 王宇辰 高翔 杜晓东 韩博 LIU Pei;PENG Guangrong;XIONG Wanlin;YANG Xingye;WANG Yuchen;GAO Xiang;DU Xiaodong;HAN Bo(CNO0OC China Limited,Shenzhen Branch.Shenzhen.Guangdong 518054,China;CNOOC Deeprater Derelopment Limited,Shenzhen,Guandong 518054,China)

机构地区：[1]中海石油(中国)有限公司深圳分公司,广东深圳518054 [2]中海石油深海开发有限公司,广东深圳518054

出　　处：《中国海上油气》2024年第1期49-60,共12页China Offshore Oil and Gas

基　　金：中国海洋石油集团有限公司“十四五”重大科技项目“海上深层/超深层油气勘探技术(编号:KJGG2022-0403)”;中国海洋石油有限公司重大科技项目“南海东部大中型天然气田勘探潜力与突破方向(编号:KJZH-2021-0003-00)”部分研究成果。

摘　　要：珠江口盆地惠州凹陷惠东新区恩平组厚度达3000 m,沉积特征整体表现为陆相浅水广盆环境,恩平组烃源岩生烃特征和成烃规模一直是困扰研究区勘探的基础问题之一。为厘清上述两个关键问题,以构造学、沉积学以及有机地球化学相结合的研究思路为指导,在化验分析数据基础之上,重新认识本地区恩平组烃源岩特征、生烃潜力及主要成藏贡献区。研究表明:惠东地区恩平组主体发育三角洲—浅湖相沉积,烃源岩包括煤、碳质泥岩和暗色泥岩;暗色泥岩有机质丰度中等—好,有机质类型为II型,具有早期生油,晚期持续生气的特征;盆地模拟计算原油地质资源量近3×108t,天然气资源量近500×108m3,资源潜力较大;油气源对比表明恩平组烃源岩来源的油气藏主要发育在惠东地区,惠东地区下一步最有利勘探方向为邻近烃源岩的深层恩平组圈闭以及“源-断-脊-圈”匹配较好的浅层珠江、珠海组圈闭。Enping Formation has a thickness of 3000 m in Huidong new area of Huizhou sag,Pearl River Mouth basin.and its sedimentary characteristics are generally characterized by continental shallow water and wide basin environment.The hydrocarbon generation characteristics and scales of Enping Formation source rocks have always been one of the basic problems in the exploration of the study area.In order to clarify the above two key issues,this study,guided by the combination of tectonics,sedimentology and organic geochemistry and based on the data of laboratory analysis,has re-recognized the source rock characteristics,hydrocarbon generation potential and main reservoir forming contribution areas of Enping Formation in this area.The research shows that the main body of Enping Formation in Huidong area develops delta-shallow lake sediments,and the source rocks include coal,carbonaceous mudstone and dark mudstone.The organic matter abundance of dark mudstone is medium-good,and the type of organic matter is type II,which has characteristics of early oil generation and late continuous gas generation.The calculated crude oil geological resources in the basin are nearly 3×10~8t,and the natural gas resources are nearly 500×10~8m~3,with great resource potential.The oil-gas source correlation shows that the oil and gas reservoirs derived from the source rocks of Enping Formation are mainly developed in Huidong area,and the next most favorable exploration direction in Huidong area is the deep Enping Formation traps adjacent to the source rocks and the shallow Zhujiang and Zhuhai formation traps with good matching of“source rocks-fault-structural ridges-trap”.

关 键 词：恩平组烃源岩 生烃特征 资源潜力 成藏贡献 惠东新区 珠江口盆地 惠州凹陷 

分 类 号：TE122[石油与天然气工程—油气勘探]