三角洲—浅海沉积体系陆源有机质分布控制因素

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。

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

The delta-shallow sea sedimentary system has both terrigenous and marine organic matter, and the distribution of terrestrial organic matter to the deep water is limited. However, more and more deep water oil and gas exploration 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 controlling factors of terrigenous organic matter distribution are systematically expounded. The results show that the distribution of terrigenous organic matter is controlled by multiple factors, such as grain size of clastic particles, mineral composition, 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 intensity 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.