天然气地质学

二元同位素在碳酸盐岩储层研究中的作用

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  • 1.中国石油杭州地质研究院,浙江 杭州 310023;
    2.中国石油碳酸盐岩储层重点实验室,浙江 杭州 310023
胡安平(1982-),女,浙江台州人,高级工程师,博士,主要从事碳酸盐岩储层成因及实验研究.E-mail:huap_hz@petrochina.com.cn.

收稿日期: 2017-07-24

  修回日期: 2017-12-01

  网络出版日期: 2018-01-10

基金资助

国家科技重大专项课题“寒武系—中新元古界碳酸盐岩规模储层形成与分布研究”(编号:2016ZX05004002);中国石油天然气股份有限公司国际合作项目“深层碳酸盐岩及深水沉积储层评价与预测技术”(编号:2016B-0402-01)联合资助.
 

The implication and significance of clumped isotope in carbonate reservoirs

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  • 1.PetroChina Hangzhou Research Institute of Geology,Hnagzhou 310023,China;
    2.CNPC Key Laboratory of Carbonate Reservoirs,Hangzhou 310023,China

Received date: 2017-07-24

  Revised date: 2017-12-01

  Online published: 2018-01-10

摘要

碳酸盐岩二元同位素是碳酸盐岩温度计,通过二元同位素可计算碳酸盐岩形成温度和流体氧同位素从而判别成岩环境,在碳酸盐岩储层成岩作用研究中发挥着重要作用。选取3组典型的碳酸盐岩样品,从二元同位素入手,结合碳、氧、锶同位素,解剖碳酸盐岩的成岩环境,总结二元同位素在碳酸盐岩储层成岩环境研究中的指示意义:①对于类型简单、未经历复杂成岩改造的碳酸盐岩,二元同位素计算结果可以直接指示其形成温度和流体性质从而判别成岩环境;②若无后期流体加入发生成岩改造,仅仅受到埋藏高温的影响,当埋藏温度达到一定值,碳酸盐岩二元同位素会受环境温度影响而发生变化使得计算的温度升高,白云石比方解石更能保持碳酸盐岩二元同位素值不变,此时流体氧同位素反映的仍是矿物初始形成环境的特征;③如果后期流体加入而发生成岩改造,无论方解石还是白云石,其二元同位素信息都会发生变化,最终二元同位素记录的则是矿物初始形成环境和后期流体加入成岩改造环境的混合结果。

本文引用格式

胡安平,沈安江,潘立银,王永生,李娴静,韦东晓 . 二元同位素在碳酸盐岩储层研究中的作用[J]. 天然气地球科学, 2018 , 29(1) : 17 -27 . DOI: 10.11764/j.issn.1672-1926.2017.12.005

Abstract

Carbonate clumped isotope has become a new kind of carbonate thermometry in recent years.After calculated from clumped isotope,the carbonate formation temperature and the oxygen isotope of the diagenetic fluids could be derived,which are of great significance to the study of diagenetic environment of carbonate reservoirs.Three kinds of typical carbonates were collected for clumped isotope and other elements isotope study,to conclude the implication of clumped isotope in the carbonate reservoirs diagenesis:①for simple samples without complex diagenetic modification,the clumped isotope and its calculated results directly indicate the temperature and fluid properties of the diagenetic environment;②for the samples only influenced by burial high temperature,the clumped isotope temperature might change and reflect the burial environment,but the oxygen isotope unchanged and indicated the original forming environment;③for the samples obviously reformed by post-diagenesis due to post-fluid entering,the clumped isotope temperature and oxygen isotope of the fluid will change in both calcite and dolomite,indicating the mixed result of the carbonate formation environment and post-diagenetic environment.
 

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