Key geological factors and evaluation methods for huge low-rank coalbed methane reservoirs：Taking Bayanhua depression in Erlian basin as an example

Authors

YAO Haipeng, School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China; Coal Geology Bureau of Inner Mongolia Autonomous Region, Hohhot 010010, China; Engineering Technology Research Center of Unconventional Gas of Inner Mongolia Autonomous Region, Hohhot 010010, China
LYU Weibo, Coal Geology Bureau of Inner Mongolia Autonomous Region, Hohhot 010010, China; Engineering Technology Research Center of Unconventional Gas of Inner Mongolia Autonomous Region, Hohhot 010010, China
WANG Kaifeng, Coal Geology Bureau of Inner Mongolia Autonomous Region, Hohhot 010010, China; Engineering Technology Research Center of Unconventional Gas of Inner Mongolia Autonomous Region, Hohhot 010010, China
LI Ling, Coal Geology Bureau of Inner Mongolia Autonomous Region, Hohhot 010010,China; Engineering Technology Research Center of Unconventional Gas of Inner Mongolia Autonomous Region, Hohhot 010010, China
LI Wenhua, Coal Geology Bureau of Inner Mongolia Autonomous Region, Hohhot 010010, China;Engineering Technology Research Center of Unconventional Gas of Inner Mongolia Autonomous Region, Hohhot 010010, China
LIN Haitao, Coal Geology Bureau of Inner Mongolia Autonomous Region, Hohhot 010010, China; Engineering Technology Research Center of Unconventional Gas of Inner Mongolia Autonomous Region, Hohhot 010010, China
LI Fengchun, Coal Geology Bureau of Inner Mongolia Autonomous Region, Hohhot 010010, China; Engineering Technology Research Center of Unconventional Gas of Inner Mongolia Autonomous Region, Hohhot 010010, China
LI Zheng, Coal Geology Bureau of Inner Mongolia Autonomous Region, Hohhot 010010, China; Engineering Technology Research Center of Unconventional Gas of Inner Mongolia Autonomous Region, Hohhot 010010, China

Abstract

In order to evaluate the potential of low rank CBM resources with large thickness, Bayanhua depression in Erlian basin is studied. By studying the genesis of CBM, buried depth of coal seam, thickness of coal seam, physical properties of coal reservoir, gas content, hydrogeology and cap rock, the key geological elements of thick and low coal rank coal reservoirs are summarized. Furthermore, a new low rank CBM resource potential evaluation method is established, and the favorable and target zones for CBM exploration and development in Bayanhua depression are delineated. The results show that the main coal-bearing strata in Bayanhua depression is the Lower Cretaceous Tenggeer Formation(K1t), which is dominated by lignite and long-flame coal, and the maceral is mainly vitrinite. CBM is mainly biogenetic and mixed genetic CBM is auxiliary. A total of three coal groups are developed in the study area. The coal reservoir has large thickness, wide development area, moderate buried depth, goodpreservation conditions, high gas content, and gas content of air drying base is up to 4.45 m3 /t. No.1 and No.2 coal groups are conducive to the formation of CBM reservoirs, and No.3 coal group is conducive to the formation of coal-bearing sandstone gas reservoirs. According to the established resource potential evaluation method, the optimal target area for CBM exploration and development is located in the northern part of Bayanhua depression.

Keywords

Erlian basin, Bayanhua depression, low rank coal CBM, geological elements of accumulation, resource potential

DOI

10.3969/j.issn.10011986.2020.01.012

Recommended Citation

YAO Haipeng, LYU Weibo, WANG Kaifeng, et al. (2020) "Key geological factors and evaluation methods for huge low-rank coalbed methane reservoirs：Taking Bayanhua depression in Erlian basin as an example," Coal Geology & Exploration: Vol. 48: Iss. 1, Article 13.
DOI: 10.3969/j.issn.10011986.2020.01.012
Available at: https://cge.researchcommons.org/journal/vol48/iss1/13

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