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天然气地球科学

• 天然气地球化学 • 上一篇    下一篇

准东中下侏罗统煤地球化学特征与低熟气形成

钱宇，王作栋，雷艳，王晓锋，梁明亮，张婷，徐永昌   

  1. 1.甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室，甘肃 兰州 730000；2.中国科学院大学，北京 100049；
    3.中国科学院广州地球化学研究所有机地球化学国家重点实验室，广东 广州 510640
  • 收稿日期:2014-07-31 修回日期:2014-10-10 出版日期:2015-06-10 发布日期:2015-06-10
  • 通讯作者: 王作栋(1966-)，男,甘肃靖远人，高级工程师，主要从事油气地球化学研究.E-mail：wangzuo_dong@163.com.
  • 作者简介:钱宇(1988-)，男， 四川乐山人，博士研究生，主要从事油气地球化学研究.E-mail：qianyu1001@sina.com.
  • 基金资助:

    中国科学院西部行动计划(编号：KZCX2-XB3-12);国家自然科学基金(编号：41072106;41402129);甘肃省重点实验室专项(编号：1309RTSA041)联合资助.

Geochemical Characteristics of the Coal from Lower-Middle Jurassic in Eastern Junggar Basin and the Generation of Low-maturity Gas

QIAN Yu，WANG Zuo-dong，LEI Yan，WANG Xiao-feng，LIANG Ming-liang，ZHANG Ting，XU Yong-chang   

  1. 1.Key Laboratory of Petroleum Resources，Gansu Province/ Key Laboratory of Petroleum Resources Research,
    Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;
    2.University of Chinese Academy of Sciences,Beijing 100049,China;
    3.State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China
  • Received:2014-07-31 Revised:2014-10-10 Online:2015-06-10 Published:2015-06-10

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摘要：

准东地区低熟气资源丰富，其形成机制及母质来源一直是研究的重点和难点。对准东中下侏罗统八道湾组和西山窑组6块低演化煤样(长焰煤—气煤)进行了全面的地球化学分析，包括岩石热解、TOC和RO测定、可溶有机质族组成分离及饱和烃和芳烃GC—MS分析等。烃源岩评价结果表明，研究样品属于较差生油岩，但具有较大的生气潜力。RO值为0.47%~0.73%，平均值为0.63%，显示样品处于低演化阶段;有机质类型以Ⅲ型为主，原始有机质主要来自高等植物。在样品饱和烃和芳烃馏分中，检测到相对丰度较高的惹烯、咔达烯、脱氢松香烷、西蒙内利烯、降海松烷等来自树脂体的化合物，此类化合物具有较低的生烃活化能，是煤在低演化阶段形成天然气的重要物质基础;同时，较丰富的苯并藿烷、异构(2-)和反异构(3-)甲基烷烃及姥鲛烷和植烷的检出表明有机质经历过轻微—中等程度的生物降解作用。此外，样品中还检出丰度较高的重排甾烷，这是烃源岩在低演化阶段经受黏土矿物催化的重要依据。综合前人研究表明，微生物的改造作用和黏土矿物的催化均可降低有机质的生烃活化能，有利于烃源岩在低演化阶段形成低熟天然气。

关键词: 准东地区, 煤, 中下侏罗统, 树脂体, 重排甾烷, 生物降解作用, 异构和反异构

Abstract:

The resource of low maturity gas in eastern Junggar Basin is abundant,and its formation mechanism and source material are the main difficulties and emphases in researches.With Rock-Eval,TOC,RO and GC-MS,saturated and aromatic hydrocarbons are analyzed.The geochemical characteristics of the low-maturity coal in the Middle Jurassic Xishanyao Formation and Lower Jurassic Badaowan Formation in eastern Junggar Basin were systematically studied.The vitrinite reflectance values range from 0.47％ to 0.73％,with an average of 0.63％,suggesting the source rocks have entered low-mature stage.Furthermore,the coals are type III organic matter that mainly comes from vascular plants.The results of source rocks evaluation indicate that samples have a great gas-prone.As an important material basis for gas formation,a series of compounds coming from resinites have been detected in saturated and aromatic hydrocarbons.Moreover,saturated hydrocarbons contain abundant benzohopanes,iso-(2-methyl) and anteiso-(3-methyl) alkanes,pristine and phytane,and high abundance is evidence for slight-moderate biodegradation.Besides,the high abundance of diasteranes could also confirm that clay materials have catalyzed the source rocks at low-maturity.Previous research showed that the biodegradation and the catalysis can decrease the activation energy of hydrocarbon,which is beneficial to gas generation at low mature stage.

Key words: Eastern Junggar Basin, Coal, Lower-Middle Jurassic, Resinite, Diasteranes, Biodegradation, Iso- and anteiso-alkanes

中图分类号: 

  • TE122.1+13

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