摘要
沉积盆地中分散有机质是油气生成的物质基础,所生成的油气的质量与数量取决于盆地内分散有机质的类型和丰度。有机质类型决定烃源岩的质量的优劣,一个没有优质烃源岩的盆地不是一个具有良好前景的含油气盆地。鄂尔多斯下古生代地层由于受沉积作用和多幕地壳构造的影响,使得研究区奥陶系碳酸盐岩有机质普遍处于高成熟和过成熟作用阶段。鄂尔多斯地区奥陶纪碳酸盐岩形成于海相环境,远离陆源物质供给区,其有机质的生源组成属腐泥类,干酪根类型应归为Ⅰ型为主。通过研究区碳酸盐岩类型热解分析结果得到研究区有机质类型为Ⅲ型,一般认为是高演化程度造成的。为了研究导致碳酸盐岩有机质类型与其生源不一的原因,需要排除热演化的干扰,对有机质类型进行恢复,将结果进行具体分析。本文旨在通过恢复有机质类型,对研究区碳酸盐岩有机质类型转化的因素进行系统的研究。
Dispersed organic matter in sedimentary basins is the material base of oil and gas production,the quality and quantity of oil and gas produced depend on the type and abundance of the dispersed organic matter in the basins. Organic matter types determine the quality of source rocks,and a basin without good source rocks is not an oil and gas bearing basin with good prospect. Due to the influence of sedimentation and multiphase tectonic effects on lower Paleozoic strata in Ordos,in Ordovician carbonate rocks organic matter is generally in high mature and over mature stage. The Ordovician carbonate rocks in Ordos area formed in a marine environment,which are far away from the terrigenous material supply area,the organic matter source composition belongs to a kind of sapropelic kerogen,which should be mainly classified as type I. By the analysis of the type of carbonate rocks in the studied area,the type of organic matter in the studied area is type III,which is generally consideredas a high degree of evolution. In order to study the reasons of different types of organic matter in carbonate rocks and their origin,it is needed to eliminate the interference of thermal evolution and recover the type of organic matter and make a concrete analysis of the results. The aim of this paper is to study the factors of the transformation of organic matter in carbonate rocks in the studied area by recovering the type of organic matter.
出处
《安徽理工大学学报（自然科学版）》
CAS
2016年第1期13-18,共6页
Journal of Anhui University of Science and Technology:Natural Science
基金
国家自然科学基金资助项目(41472136)
关键词
碳酸盐岩
有机质类型
有机质恢复
carbonate rocks
organic matter type
organic matter recovery
