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天然气地球科学

• 天然气地球化学 • 上一篇    下一篇

潮水盆地侏罗系烃源岩地球化学特征及油气勘探方向

涂建琪1,2，李成建1,3，南红丽1,3，张斌1,2，刘燕4，费轩冬1,2，周文宝1,2，袁懿琳1,2   

  1. 1.中国石油勘探开发研究院实验研究中心，北京 100083;
    2.中国石油油气地球化学重点实验室，北京 100083；
    3.中国矿业大学(北京)地球科学与测绘工程学院，北京 100083;
    4.中国石油玉门油田勘探开发研究院，甘肃 酒泉 735019
  • 收稿日期:2015-12-14 修回日期:2016-02-22 出版日期:2016-07-10 发布日期:2016-07-10
  • 作者简介:涂建琪(1966-)，男，江西丰城人，高级工程师，博士，主要从事油气源岩地质评价与有机岩石学研究. E-mail:jqtu@petrochina.com.cn.
  • 基金资助:
    中国石油天然气股份有限公司重大科技专项“玉门油田重上百万吨勘探开发关键技术研究”（编号：2012E-3302）资助.

The geochemical characteristics of Jurassic source rock and oil-gas exploration direction in Chaoshui Basin,China

Tu Jian-qi1,2，Li Cheng-jian1,3，Nan Hong-li1,3，Zhang Bin1,2，Liu Yan4，Fei Xuan-dong1,2，Zhou Wen-bao1,2，Yuan Yi-lin1,2   

  1. 1.Central Laboratory of Geoscience,Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China；2.Key Laboratory of Petroleum Geochemistry,PetroChina,Beijing 100083,China；3.China University of Mining and Technology,Beijing 100083,China；4.Research Institute of Petroleum Exploration and Development,Yumen Oilfield Company,PetroChina,Jiuquan 735019,China
  • Received:2015-12-14 Revised:2016-02-22 Online:2016-07-10 Published:2016-07-10

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摘要： 潮水盆地不同地区重要探井岩心和岩屑样品的系统地球化学分析揭示，潮水盆地侏罗系新河组发育规模性湖相优质泥质烃源岩，青土井组部分层段也出现湖相优质泥质烃源岩，其有机质丰度高、有机质类型好，主要为Ⅱ1 — Ⅰ型，腐泥组含量高，为半深湖—深湖相沉积；青土井组和芨芨沟组还发育有机质类型较差的中等煤系烃源岩。新河组泥质烃源岩是盆地最主要的烃源岩，青土井组烃源岩是次要烃源岩。烃源岩热演化程度呈“北低南高，上低下高” 差异性分布特点，且烃源岩的成熟度与现今埋深基本呈正相关关系；盆地北部新河组处于未成熟—低成熟阶段，盆地南部则处于低成熟—成熟阶段；盆地北部青土井组处于低成熟阶段，盆地南部则处于成熟阶段；盆地南部金昌坳陷生油条件优于盆地北部红柳园坳陷和阿右旗坳陷。盆地南部金昌坳陷附近的构造高部位和坳陷内低隆构造部位及岩性圈闭发育部位是下一步油气勘探值得关注的主要方向，盆地北部红柳园坳陷和阿右旗坳陷的侏罗系烃源岩现今埋深较大的区域内的低隆部位和烃源岩内部则是寻找致密油藏的有利地区。

关键词: 侏罗系, 烃源岩, 有机质丰度, 有机质类型, 有机质成熟度, 潮水盆地

Abstract: The high-quality lacustrine muddy source rocks(TOC>1.0%,S1+S2>6.0mg/g)are discovered and confirmed through a variety of organic geochemical analyses on dense core and debris samples from different parts of Chaoshui Basin,which is in scale in Jurassic Xinhe Formation and in some segments of Qingtujing Formation.The high-quality muddy source rocks,developed in semi-deep lake and deep lake facies,contain high organic matter abundance,good organic matter type(mainly for Ⅱ1 to type Ⅰ)and high sapropelinite content.The medium coal measure source rocks with poor type of organic matter are developed in Qingtujing Formation and Jijigou Formation.The mudstone source rocks of Xinhe Formation are the main source rocks and those of Qingtujing Formation are secondary source rocks in Chaoshui Basin.The significant difference in the organic maturity of source rocks shows that “lower in the north basin and higher in the south basin,lower in upper part and higher in lower part in each section”.There is positive correlation between the maturity of source rock and the present burial depth.The source rocks of Xinhe Formation in the north of the basin is in immature to low mature stage and those in the south is in low-mature to mature stage.The source rocks of Qingtujing Formation in the north is in low mature stage and those in the south is in mature stage.The oil-generating conditions in the Jinchang Depression in the south of the basin are better than those of Hongliuyuan Depression and Ayouqi Depression in the north of the basin.The next prospecting targets for petroleum exploration are the structural high part in the vicinity of Jinchang Depression and the low uplift structure and lithologic traps developed within Jinchang Depression in the south of the basin.The favorable area for finding tight oil reservoirs is the region of low uplift location and within hydrocarbon source rocks in Hongliuyuan Depression and Ayouqi Depression in the north of the basin,where Jurassic lacustrine high-quality source rock is in deeper buried area.

Key words: Jurassic, Source rock, Organic matter abundance, Organic matter type, Organic maturity, Chaoshui Basin

中图分类号: 

  • TE122.1+13

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