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天然气地球科学

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琼东南盆地深水区中央坳陷带东部渐新统烃源岩分布及评价

王子嵩，刘震，黄保家，孙志鹏，姚哲，陈宇航，刘 鹏，王兵   

  1. 1.中国石油大学(北京)地球科学学院，北京 102249;
    2.中国石油大学油气资源与探测国家重点实验室，北京 102249;
    3.中海油(中国)有限公司湛江分公司，广东 湛江 524057
  • 收稿日期:2013-05-29 修回日期:2013-08-06 出版日期:2014-03-10 发布日期:2014-03-10
  • 通讯作者: 王子嵩wangzisong1986@163.com. E-mail:wangzisong1986@163.com.
  • 作者简介:王子嵩(1986-),男,山东潍坊人,博士研究生,主要从事油气成藏机理与分布规律的研究.E-mail:wangzisong1986@163.com.
  • 基金资助:

    “十二五”国家科技重大专项“南海北部深水区成藏组合评价研究”（编号：2011ZX05025-002-05)资助.

Distribution and Evaluation of Oligocene Source Rocks in the East of  Central Depression Belt in Deep-water Area,Qiongdongnan Basin

WANG Zi-song，LIU Zhen，HUANG Bao-jia，SUN Zhi-peng，YAO Zhe，CHEN Yu-hang，LIU Peng，WANG Bing   

  1. 1.College of Geosciences,China University of Petroleum,Beijing 102249,China;
    2.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,
    Beijing 102249,China;3.Zhanjiang Branch of CNOOC Ltd.,Zhanjiang 524057,China
  • Received:2013-05-29 Revised:2013-08-06 Online:2014-03-10 Published:2014-03-10

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539

摘要：

琼东南盆地深水区是中国海上油气勘探的前沿阵地和油气资源接替的重要战略选区，而确定烃源岩分布特征是深水区低勘探领域石油地质研究的首要任务。在预测及确定中央坳陷带东部渐新统烃源岩厚度、成熟度和有机相等分布特征的基础上，通过计算烃源岩体积、生气量、生气强度等，完成了烃源岩的综合评价，最终实现了富生烃凹陷的优选。研究表明:①整体上，陵水组烃源岩厚度大于崖城组，其中崖二段和陵二段为烃源岩最为发育的层段，同时泥岩沉积中心表现出从西向东、从崖城组零星分布到陵水组统一连片的演化趋势;②烃源岩热演化呈现西早东晚、现今成熟度呈现西高东低的趋势;③渐新统烃源岩质量整体较好，其中煤层为优质烃源岩，泥岩为中等—好烃源岩;崖城组主要有机相为浅海相和滨海相，而陵水组主要有机相为内、外浅海相;④宝岛凹陷、长昌凹陷和松南凹陷均达到富生气凹陷级别，但前者综合评价为最好级别，后两者则分别为较好和一般。

关键词: 综合评价, 分布特征, 烃源岩, 渐新统, 中央坳陷带, 深水区, 琼东南盆地

Abstract:

Based on the prediction and determination of the distribution characteristics of thickness,maturity and organic facies of Oligocene source rocks in the east of Central Depression Belt,according to the calculation of the volume,gas generation quantity and intensity of source rocks,source rocks were comprehensively evaluated and the gas-rich sags were optimized.The results show:(1)Generally,Lingshui source rocks are thicker than those of Yacheng,and the percentages of mud in Ya-2 member and Ling-2 member are the most of all.The mud deposition centers evolved from west to east and from sporadic distribution in Yacheng Formation to regional distribution in Lingshui Formation;(2)The thermal evolution of source rocks was early in the west and late in the east, and the modern maturities of different formations are high in the west and low in the east;(3)The quality of Oligocene source rocks is better in general,in which the coal layer is excellent in gas generation capacity,and the gas generation capacity of mud is from moderate to good.The main organic facies in Yacheng Formation are shallow sea and shore,but the main organic facies in Lingshui Formation are inner and outer shallow sea;(4)Baodao Sag,Changchang Sag and Songnan Sag are all gas-rich sags.However,Baodao Sag is the best,follows by the Changchang Sag,and then by the Songnan Sag.

Key words: General evaluation, Distribution characteristics, Source rocks, Oligocene, The Central Depression Belt, Deep-water area, Qiongdongnan Basin

中图分类号: 

  • TE122.1+15

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