0 引言
1 地质背景
2 下寒武统海相烃源岩有机地球化学特征
图1 鄂尔多斯盆地南缘露头剖面位置(a)和下寒武统周家河剖面柱状图(b)Fig.1 Outcrop profile position (a) and Lower Cambrian Zhoujiahe profile (b) in the southern margin of Ordos Basin |
The organic geochemical characteristics of Lower Cambrian marine source rocks and its contribution to hydrocarbon accumulation in the southern margin of Ordos Basin
Received date: 2021-09-14
Revised date: 2021-11-17
Online published: 2022-03-22
Supported by
The Key Project of Exploration and Production Company, PetroChina Company Limited(kt2021-04-01)
The marine source rocks of Lower Cambrian are mainly developed in Luonan and Zhoujiahe areas in the southern margin of Ordos Basin. The lithology of source rocks is mainly shale, with local dynamic metamorphism and argillaceous slate. The organic geochemical analysis shows that the thickness of the source rock is about 0-80 m, and the total organic carbon content (TOC) is between 0.10% and 13.75%, with an average of 3.32%. 91% of the samples have TOC content greater than 1%, and 52% of the samples have TOC content greater than 2%. The type of organic matter is mainly type II1, with a small amount of type I. The source rocks have experienced a high degree of thermal evolution, with equivalent vitrinite reflectance of 2.25% - 2.71% and the methylphenanthrene ratio (F1) between 0.46 and 0.60. The overall evaluation is high quality gas source rocks. Although the Cambrian-Ordovician was uplifted and eroded by the Caledonian and Huaiyuan Movements in the Ordos Basin, the Cambrian-Ordovician strata in the Qingyang paleo-uplift and the area to the south remained generally inclined to the south, the oil and gas generated from the Lower Cambrian marine source rocks developed in the North Qinling-Luonan area can migrate and accumulate in the direction of the Qingyang paleo-uplift. The characteristics of Cambrian natural gas in the south of Ordos Basin are similar to those in Gaomo area of Sichuan Basin, and they are both carbon isotope reverse sequence oil type gas. The carbon isotope of ethane from Cambrian natural gas is the lightest in the Lower Paleozoic, and the carbon isotope distribution of methane is similar to that of kerogen in the Lower Cambrian source rocks. There are direct evidences that the Lower Cambrian source rocks have contributed to the hydrocarbon accumulation of natural gas in the southern Ordos Basin. Besides, the relationship between Cambrian reservoir bitumen and Lower Cambrian source rocks in the south of the basin is the indirect evidence of the Cambrian gas accumulation in the south of the basin.
Junping HUANG , Junfeng LIN , Yan ZHANG , Xinshe LIU , Zhurong CHEN , Xiangbo LI , Yating WANG . The organic geochemical characteristics of Lower Cambrian marine source rocks and its contribution to hydrocarbon accumulation in the southern margin of Ordos Basin[J]. Natural Gas Geoscience, 2022 , 33(3) : 461 -471 . DOI: 10.11764/j.issn.1672-1926.2021.11.007
图1 鄂尔多斯盆地南缘露头剖面位置(a)和下寒武统周家河剖面柱状图(b)Fig.1 Outcrop profile position (a) and Lower Cambrian Zhoujiahe profile (b) in the southern margin of Ordos Basin |
感谢中国石油长庆油田分公司勘探开发研究院袁效奇高级工程师、河南理工大学张小东教授及硕士研究生平晓朵、孙泽源和王芳芳在野外工作中的帮助!感谢中国石油长庆油田分公司勘探开发研究院魏新善、张雷、章贵松和井向辉等领导和专家指导及帮助!感谢评审专家提出的宝贵意见!
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