天然气地球化学

准东中下侏罗统煤地球化学特征与低熟气形成

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  • 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
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.

收稿日期: 2014-07-31

  修回日期: 2014-10-10

  网络出版日期: 2015-06-10

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

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  • 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 date: 2014-07-31

  Revised date: 2014-10-10

  Online published: 2015-06-10

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。

本文引用格式

钱宇,王作栋,雷艳,王晓锋,梁明亮,张婷,徐永昌 . 准东中下侏罗统煤地球化学特征与低熟气形成[J]. 天然气地球科学, 2015 , 26(6) : 1137 -1146 . DOI: 10.11764/j.issn.1672-1926.2015.06.1137

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.

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