石油勘探与开发 >

2016 , Vol. 43 >Issue 4: 540 - 549

DOI: https://doi.org/10.11698/PED.2016.04.05

油气勘探

鄂尔多斯盆地下古生界烃源岩与天然气成因

  • 刘丹 ,
  • 张文正 ,
  • 孔庆芬 ,
  • 冯子齐 ,
  • 房忱琛 ,
  • 彭威龙
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  • 1. 中国石油勘探开发研究院；
    2. 中国石油长庆油田公司勘探开发研究院
刘丹（1986-）,女,河北廊坊人,现为中国石油勘探开发研究院在读博士,主要从事天然气地质与地球化学研究工作。地址：北京市海淀区学院路20号,中国石油勘探开发研究院石油地质实验研究中心,邮政编码：100083。E-mail: liudan829@163.com

网络出版日期: 2016-11-02

基金资助

中国石油天然气股份有限公司“中国煤成气地球化学与成藏机制规律研究”项目（2014B-0608）

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Lower Paleozoic source rocks and natural gas origins in Ordos Basin, NW China

  • LIU Dan ,
  • ZHANG Wenzheng ,
  • KONG Qingfen ,
  • FENG Ziqi ,
  • FANG Chenchen ,
  • PENG Weilong
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  • 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    2. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi’an 710018, China

Online published: 2016-11-02

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摘要

基于鄂尔多斯盆地古生界154口井天然气样品地球化学特征及成因的分类研究,结合盆地下古生界733块烃源岩样品有机质丰度评价,探讨盆地下古生界天然气来源问题。通过分析天然气样品的烷烃气碳同位素组成,结合其地质背景,将盆地下古生界天然气成因及来源分为3个大类4个亚类：①源于上古生界煤系的煤成气;②下古生界自生自储的油型气;③源于上古生界煤系与古生界灰岩的混合气,又可分为正碳同位素系列混合气和负碳同位素系列混合气2个亚类。烃源岩样品TOC、有机显微组分分析表明,盐下样品平均TOC值为0.3%,TOC值大于0.4%的样品占28.2%,其干酪根类型为腐泥型,指示较强的生烃潜力。鄂尔多斯盆地下古生界天然气以来源于上古生界煤系的煤成气为主,在盆地中东部盐下的储集层中发育下古生界自生自储油型气,且其发育一定规模的有效烃源岩,可作为下古生界天然气气源。图7表2参29

关键词： 鄂尔多斯盆地; 下古生界; 天然气成因; 烃源岩

本文引用格式

刘丹 , 张文正 , 孔庆芬 , 冯子齐 , 房忱琛 , 彭威龙 . 鄂尔多斯盆地下古生界烃源岩与天然气成因[J]. 石油勘探与开发, 2016 , 43(4) : 540 -549 . DOI: 10.11698/PED.2016.04.05

Abstract

Based on the geochemical characteristics of Lower Paleozoic gases from 154 most recently drilled wells and their genetic type, in combination with the organic abundance evaluation of 733 core samples from the Lower Paleozoic, the origin of Lower Paleozoic gases in Ordos Basin was discussed. According to the carbon isotope data of paraffin gases in the gas samples and the geological background, the Lower Paleozoic gases are divided into three types and four sub-types: (1) the coal-derived gas generated from the Upper Paleozoic coaly source rock; (2) the oil-associated gas sourced from the Lower Paleozoic source rock, and (3) the mixing gas originated from the Upper Paleozoic coaly source rock and Paleozoic limestone, and the mixing gas can be divided into two sub-types, the mixing gas of positive carbon isotopic series and that of negative carbon isotopic series. From the TOC and organic maceral results of Lower Paleozoic source rock, the samples below salt have an average TOC of 0.3%, with 28.2% of them having TOC>0.4%, the kerogen type being sapropel type, showing great gas generating potential. The Lower Paleozoic gases are primarily coal-derived gas generated from the Upper Paleozoic coal, some oil-associated gas of self-source and self-reservoir can be found in pre-salt reservoirs in the central-eastern basin, where the developed source rock can serve as the source of some Lower Paleozoic gas.

Key words： Ordos Basin; Lower Paleozoic; natural gas origin; source rock

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