石油学报 ›› 2019, Vol. 40 ›› Issue (10): 1147-1157.DOI: 10.7623/syxb201910001

• 地质勘探 •    下一篇

苏拉特盆地煤系气高产地质原因及启示

秦勇1, 申建1, 沈玉林1, 李耿1, 范炳恒1, 姚海鹏1,2   

  1. 1. 中国矿业大学煤层气资源与成藏过程教育部重点实验室 江苏徐州 221008;
    2. 内蒙古自治区煤田地质局 内蒙古呼和浩特 010010
  • 收稿日期:2018-09-10 修回日期:2019-03-25 出版日期:2019-10-25 发布日期:2019-11-09
  • 通讯作者: 秦勇,男,1957年6月生,1981年获焦作矿业学院学士学位,1992年获中国矿业大学博士学位,现为中国矿业大学教授,长期从事化石能源地质研究工作。Email:yongqin@cumt.edu.cn
  • 作者简介:秦勇,男,1957年6月生,1981年获焦作矿业学院学士学位,1992年获中国矿业大学博士学位,现为中国矿业大学教授,长期从事化石能源地质研究工作。Email:yongqin@cumt.edu.cn
  • 基金资助:

    国家自然科学基金重点项目(No.41530314)和国家科技重大专项(2016ZX05066-01,2016ZX05044-02)资助。

Geological causes and inspirations for high production of coal measure gas in Surat Basin

Qin Yong1, Shen Jian1, Shen Yulin1, Li Geng1, Fan Bingheng1, Yao Haipeng1,2   

  1. 1. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Jiangsu Xuzhou 221008, China;
    2. Coal Geology Bureau of Inner Mongolia Autonomous Region, Inner Mongolia Hohhot 010010, China
  • Received:2018-09-10 Revised:2019-03-25 Online:2019-10-25 Published:2019-11-09

摘要:

澳大利亚苏拉特盆地煤系气开发的巨大成功为破解中国煤层气产业困境提供了新的启示。这一成功的关键在于薄煤层与碎屑岩类频繁互层所衍生的成藏地质条件,其实质在于:①该类煤系中单一含气层(各类岩性天然气储层)较薄,但累积生烃潜力巨大,且可构成天然气优质复合储集体;②薄互层储层更有利于天然裂隙发育,为高渗复合储层的发育奠定了关键的基础。此外,多而薄的煤层在保证生气能力的同时与围岩之间具有更大的接触表面积,有利于煤层气排出并转化为煤系游离气,也有助于煤层脱水和煤层气解吸产出。与苏拉特盆地煤系基本地质条件类似的含煤地层在中国并不鲜见,如内蒙古东部地区下白垩统、鄂尔多斯盆地西缘上石炭统、四川盆地西部上三叠统、楚雄盆地上三叠统等。建议关注该类煤系气的新领域和新层系,采用针对性的参数和思路,对这些地区和煤系开展专项评价研究和专项勘探,为保障"增储上产"的国家油气安全战略提供新的天然气资源基础。

关键词: 煤系气, 薄互层, 复合储集体, 地质条件, 苏拉特盆地

Abstract:

The coal measure gas (CMG) development in Surat Basin, Australia has achieved great success, thus providing new inspiration for solving dilemmas faced by the coalbed methane (CBM) industry in China. The success depends on the reservoir-forming geological conditions derived from the frequent interbedding of thin coal seams and clastic rocks, and two essential aspects are as below:firstly, the single gas-bearing reservoir in this coal measures are relatively thin, but its accumulated hydrocarbon generation potential is huge, and thus can be developed into a high-quality composite gas reservoir; secondly, the thin interbedded reservoir is more conducive to the development of natural fractures, laying a key foundation for the development of high-permeability composite reservoir. In addition, the many and thin coal measures have a large contact surface with the surrounding rocks while ensuring the gas generating capacity, which is conducive to the transformation of CBM into coal measure free gas and also helpful to coal dehydration and the desorption and production of CBM. Coal-bearing strata that have the basic geological conditions similar to the coal-bearing system in Surat Basin are not uncommon in China, such as the Lower Cretaceous in the eastern Inner Mongolia, the Upper Carboniferous in the western margin of Ordos Basin, the Upper Triassic in the western Sichuan Basin, and the Upper Triassic in Chuxiong Basin. It is suggested to pay attention to the new fields and new layers of this type of CMG, and based on the specific parameters and ideas, carry out special evaluation research and special exploration for these areas and coal measures, laying a new natural gas resource foundation to guarantee the national oil and gas security strategy of "increasing reserves and production".

Key words: coal measure gas, thin interbedding, composite reservoir, geological condition, Surat Basin

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