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天然气地球科学

• 天然气地质学 • 上一篇    下一篇

鄂尔多斯盆地马家沟组盐下碳酸盐岩烃源岩分布特征

姚泾利1，王程程2，陈娟萍1，高岗2，王飞雁1，李晓凤2，李佳烨2，刘岩2   

  1. 1.中国石油长庆油田分公司勘探开发研究院，陕西 西安 710018；
    2.中国石油大学（北京）油气资源与探测国家重点实验室,北京 102249
  • 收稿日期:2016-08-08 修回日期:2016-10-25 出版日期:2016-12-10 发布日期:2016-12-10
  • 通讯作者: 高岗（1966-），男，陕西高陵人，副教授，博士，硕士生导师，主要从事油气勘探与开发的科研与教学工作. E-mail：gaogang2819@sina.com.
  • 作者简介:姚泾利（1964-），男，陕西泾阳人，教授级高级工程师，博士，主要从事油气勘探及综合地质研究.E-mail：yjl_cq@cnpc.com.cn.
  • 基金资助:
    国家自然科学基金（编号:41372142）；中国石油勘探开发研究院项目(编号:2013E-050207)联合资助.

Distribution characteristics of subsalt carbonate source rocksin Majiagou Formation,Ordos Basin

Yao Jing-li1，Wang Cheng-cheng2，Chen Juan-ping1，Gao Gang2，Wang Fei-yan1，Li Xiao-feng2，Li Jia-ye2，Liu Yan2   

  1. 1.Research Institute of Exploration & Development of PetroChina Changqing Oilfield Company,Xi’an 710018,China;
    2.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China
  • Received:2016-08-08 Revised:2016-10-25 Online:2016-12-10 Published:2016-12-10

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摘要： 针对鄂尔多斯盆地中东部盐下奥陶系内幕天然气自生自储特征及其相应烃源岩发育不清的实际，利用地球化学与测井技术相结合的方法，分析了研究区奥陶系盐下烃源岩的分布特征。奥陶系马家沟组马五6亚段膏岩最为发育，分布最为广泛，该膏岩层之下发现的自生自储天然气出气点表明了海相碳酸盐岩烃源岩具有一定的生排气能力。研究表明:研究区马家沟组盐下碳酸盐岩烃源岩有机质丰度总体偏低，测试的有机碳含量平均值约为0.2%，大部分低于0.5%；岩石热解Tma 平均值达484℃,处于高成熟—过成熟阶段。平面分布上，盐下碳酸盐岩烃源岩有机碳含量在西部相对较高，向东逐渐降低；有机碳含量在北部相对较高，向盆地中部降低，最南部略有升高。研究区存在3个相对较好的烃源岩有利分布区。

关键词: 鄂尔多斯盆地, 奥陶系, 马家沟组, 碳酸盐岩, 气源岩

Abstract: Aimed at the fact of the self-preserved and self-generated characteristics of the Ordovician inside-scene subsalt gas reservoir and ambiguous recognition of the development of its corresponding source rocks,the distribution features of the Ordovician subsalt source rocks in the study area have been analyzed by jointly employing organic geochemistry and well logging technology.The gypsum layers are most widely developed in the 6 sub-members of the member 5 of the Ordovician Majiagou Formation with the widest distribution.The gas production points of the self-stored and self-generated natural gas discovered below the gypsum layers indicate that the marine carbonate source rocks are entitle certain ability for gas generation and discharging.It is indicated in the study that generally the subsalt carbonate source rocks in the Majiagou Formation have low organic matter abundance with a measured mean TOC content of about 0.2%,most of them being lower than 0.5%.The average rock pyrolysis peak temperature reaches 484℃,seating in the stage of highly-mature to overmature.On plane,the subsalt carbonate source rocks show high TOC content in the west,decreasing gradually in the east.It is higher in north Ordos Basin and decreased to the center;however it finally increased in south Ordos Basin.There are three favorable areas for the distribution of relative source rocks in the study area.

Key words: Ordos Basin, Ordovician, Majiagou Formation, Carbonate source rock, Natural gas

中图分类号: 

  • TE122.1

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