鄂尔多斯西缘南段下古生界烃源岩综合评价  

Comprehensive Evaluation of Source Rocks in the Southern Section of the Western Margin of the Lower Paleozoic in Ordos Basin

作　　者：樊靖[1] 王文[1] 陈新[1] 

机构地区：[1]西北大学大陆动力学国家重点实验室,陕西西安710069

出　　处：《辽宁化工》2016年第8期1022-1024,共3页Liaoning Chemical Industry

摘　　要：鄂尔多斯盆地西缘南段下古生界陆缘沉积环境发育了碳酸盐岩和泥页岩2种岩性的烃源岩。虽然有机质丰度较低,但通过对研究区的勘探,较好的烃源岩一般多为Ⅰ、Ⅱ型,发育在弱还原—还原、盐度较大的半深水环境中。地质和地球化学分析证实,现今下古生界奥陶系烃源岩有较高的生烃过程,达到了高演化阶段,以马家沟组碳酸盐岩、平凉组暗色泥岩、碳酸盐岩3套烃源岩为主,但存在一定差异。该区南缘地区具有较大的生烃量,其中平凉组作为主力烃源岩层,已进入高成熟—过成熟阶段,以生干气为主。Lower Paleozoic continental margin sedimentary environment in the western edge of the southern section of Ordos Basin developed carbonate rocks and shale two kinds of source rocks. Although the abundance of organic matter is low, but through exploration of the study area, the better source rocks are generally typeⅠ,Ⅱ, which developed in the semi deep water environment with weak reduction and salinity. Geological and geochemical analysis has confirmed that nowadays the Paleozoic Era Ordovician source rocks have a higher hydrocarbon generation process. Majiagou Formation carbonates, Pingliang Formation dark mudstone, carbonate rocks are mainly three sets of source rocks, but there are some differences. The southern edge of the district area has a large of hydrocarbon generation, Pingliang Formation as the main source rocks has entered a high mature- over mature stage, the main gases are dry gas.

关 键 词：鄂尔多斯盆地 下古生界 烃源岩 碳酸盐岩 生烃量 

分 类 号：TE122[石油与天然气工程—油气勘探]