东海陆架盆地丽水-椒江凹陷灵峰组海相烃源岩发育主控因素及分布特征  

Controlling factors and distribution characteristics of marine source rocks in the Lingfeng Formation of the Lishui-Jiaojiang Sag in the East China Sea Shelf Basin

作　　者：李林致 李婧婧 廖计华 郭刚 王欣 李峰 LI Linzhi;LI Jingjing;LIAO Jihua;GUO Gang;WANG Xin;LI Feng(CNOOC Research Institute Ltd.,Beijing 100028,China)

机构地区：[1]中海油研究总院有限责任公司,北京100028

出　　处：《海洋地质前沿》2025年第2期21-29,共9页Marine Geology Frontiers

基　　金：国家科技重大专项“中国近海富烃凹陷优选与有利勘探方向预测”(2016ZX05024-002)。

摘　　要：东海陆架盆地丽水-椒江凹陷古新统烃源岩的研究主要集中在月桂峰组湖相烃源岩,而对于灵峰组海相优质烃源岩的形成条件与分布规律尚不明确。综合利用地质、地球化学和古生物等资料,在烃源岩有机地球化学特征分析的基础上,探讨了丽水-椒江凹陷灵峰组海相烃源岩发育的主控因素,并对烃源岩的形成模式和分布进行了探究。结果表明,丽水-椒江凹陷灵峰组发育中等—好级别的陆源海相烃源岩,内部不同洼陷具有较强的非均质性;烃源岩的发育受古生产力、陆源输入和水体条件等因素的综合影响。平面上,丽水-椒江凹陷灵峰组海相烃源岩的规模和质量与该区三角洲-滨浅海的沉积环境密切相关。三角洲前缘和近三角洲的浅海相带陆源有机质输入量大,在弱氧化—弱还原环境下发育高丰度烃源岩,是灵峰组好烃源岩发育的有利相带。Research on the Paleogene source rocks in the Lishui-Jiaojiang Sag(LJS)of the East China Sea Shelf Basin focuses on mainly the lacustrine source rocks of the Yueguifeng Formation,while the formation conditions and distribution patterns of high-quality marine source rocks of the Lingfeng Formation are not yet clear.Based on the comprehensive utilization of geological,geochemical,and paleontological data,and the analysis of organic geochemical characteristics of source rocks,we explored the main controlling factors for the development of marine source rocks in the Lingfeng Formation of the LJS,and their formation patterns and distribution.Results show that the Lingfeng Formation in the LJS developed moderate to good grade terrestrial marine source rocks,and different internal sags have strong heterogeneity.The development of hydrocarbon source rocks is comprehensively influenced by factors such as paleoproductivity,source input,and hydraulic conditions.From a planar perspective,the scale and quality of the source rocks in the LJS are closely related to the sedimentary environment of the deltaic coastal shallow sea.The delta front and near-delta shallow marine facies have a large amount of terrigenous organic matter input,and high abundance source rocks are developed in a weak oxidation weak reduction environment,which is a favorable facies zone for the development of high-quality source rocks in the Lingfeng Formation.

关 键 词：丽水-椒江凹陷 灵峰组 海相烃源岩 主控因素 陆源有机质输入 

分 类 号：P736[天文地球—海洋地质] P618.13[天文地球—海洋科学]