三角洲—浅海沉积体系陆源有机质分布控制因素  

Control Factors of Terrestrial Organic Matter Distribution in Delta-shallow Sea Sedimentary System

作　　者：屈童 高岗[1,2] 徐新德 刘凤妍[4] QU Tong;GAO Gang;XU XinDe;LIU FengYan(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;CNOOC China Limited,Zhanjiang Branch,Zhanjiang,Guangdong 524057,China;Exploration&Development Research Institute,PetroChina Huabei Oilfield Company,Renqiu,Hebei 062552,China)

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中海石油(中国)有限公司湛江分公司,广东湛江524057 [4]华北油田分公司勘探开发研究院,河北任丘062552

出　　处：《沉积学报》2020年第3期648-660,共13页Acta Sedimentologica Sinica

基　　金：中海油“十三五”油气资源评价项目(YXKY-2018-KT-01);“十三五”全国油气资源评价项目中海油矿权区油气资源评价(2017YQZYPJ0109)。

摘　　要：三角洲—浅海沉积体系中同时存在陆源有机质与海洋有机质,向深水方向陆源有机质的分布受限,但越来越多的深水区油气勘探实践发现陆源有机质的贡献,证明陆源有机质在深水区的存在及其对油气生成具有重要意义。通过系统分析陆源有机质的分布规律,从而阐述了影响陆源有机质分布的主要因素及其相互关系。研究结果表明:陆源有机质的分布受碎屑粒度、矿物组成、有机质组成、水动力类型、水动力强度、水体盐度及pH值等多因素控制,各因素间相互联系、相互影响。将其控制因素可系统归纳为物源条件、搬运条件及沉积与保存条件。水动力类型与水动力强度是陆源有机质存在于深水区的关键因素,生物作用可能成为陆源有机质分布的主控因素,环境因素及成岩作用是影响陆源有机质保存的重要因素。The delta-shallow sea sedimentary system has both terrigenous and marine organic matter,and the distri-bution of terrestrial organic matter to the deep water is limited.However,more and more deep water oil and gas explo-ration practices have found the contribution of terrestrial organic matter,which proves its importance to oil and gas development.Based on the systematic analysis of the terrestrial organic matter distribution law,this paper expounds on the relevant factors affecting the distribution of terrestrial organic matter and their interrelationships.The control-ling factors of terrigenous organic matter distribution are systematically expounded.The results show that the distribu-tion of terrigenous organic matter is controlled by multiple factors,such as grain size of clastic particles,mineral com-position,organic matter composition,hydrodynamic type,hydrodynamic intensity,water salinity,and PH value,and the factors are interrelated and interacted.The control factors can be systematically summarized into sedimentary source condition,transportation condition,and sedimentation and preservation condition.Hydrodynamic type and in-tensity are the key factors for the existence of terrigenous organic matter in the deep water area.Biological action may become the main controlling factor of terrestrial organic matter distribution.Environmental factors and diagenesis are important factors affecting the preservation of terrestrial organic matter.

关 键 词：三角洲—浅海沉积体系 陆源有机质 分布规律 影响因素 

分 类 号：P618.13[天文地球—矿床学]