珠江口盆地陆丰13洼文昌组烃源岩地化特征及成藏贡献  

Geochemical Characteristics and Reservoir Forming Contribution of Source Rocks of Wenchang Formation in Lufeng 13 Depression Pearl River Mouth Basin

作　　者：郑仰帝 Zheng Yangdi(Shenzhen Branch of China National Offshore Oil Corporation(China)Co.,Ltd.,Guangdong,518054;China National Offshore Oil Corporation Deepwater Development,Guangdong,518054)

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

出　　处：《当代化工研究》2024年第12期52-54,共3页Modern Chemical Research

基　　金：中海油科研项目“陆丰北迁移转换作用下构造沉积差异性及有利区带优选”(项目编号:SCKY-2024-SZ-04)。

摘　　要：珠江口盆地陆丰13洼钻揭文昌组泥质烃源岩的钻井多达30余口,为解决文昌组各段源岩的地化特征、生烃潜力和成藏贡献问题,开展了烃源岩的岩石热解、镜质体反射率及可溶有机质饱和烃色谱-质谱等综合研究。结果表明:陆丰13洼文昌组发育文三段和文四段两套湖相烃源岩,文四段为主力源岩层系,有机质丰度为好-很好,以腐泥型有机质为主;文三段稍差,属于中等-好源岩,混合型有机质。文昌组整体处于低成熟-成熟热演化阶段,烃源岩排烃门限深度为3600 m。文四段烃源品质最优,热演化程度更高,成藏贡献大。该研究证实了文昌组具备良好的生烃条件和潜力,进一步坚定了洼陷周边油气勘探的信心。More than 30 wells have been drilled to expose the argillaceous source rocks of Wenchang Formation in lufeng 13 depression of the Pearl River Mouth Basin.In order to analysis the geochemical characteristics,hydrocarbon generation potential and reservoir contribution of the source rocks in each section of the Wenchang Formation,comprehensive research has been conducted on rock pyrolysis analysis,vitrinite reflectance measurement,and saturated hydrocarbon chromatography-mass spectrometry of soluble organic matter.The research results indicate that two sets of lacustrine hydrocarbon source rocks,namely the Wensan and Wensi sections,are developed in the Wenchang Formation of lufeng 13 depression,WC4 mudstone is the main source rock with good to well organic matter abundance,mainly composed of sapropelic organic matter.WC3 has slightly poor oil generation potential,with medium to good source rocks and mixed organic matter.The Wenchang Formation is generally in a low to mature thermal evolution,with a hydrocarbon expulsion threshold depth of 3600 m.WC4 section has the best hydrocarbon source quality,higher degree of thermal evolution,and a greater contribution to reservoir formation.This study confirms that the Wenchang Formation has good hydrocarbon generation condition and potential,further strengthening confidence in oil and gas exploration around the depression.

关 键 词：烃源岩 地化特征 文昌组 排烃门限深度 陆丰13洼 

分 类 号：P744.4[天文地球—海洋科学]