Reservoir forming characteristics and favorable area evaluation of deep coalbed methane in Daning-Jixian Block

Authors

LI Shuguang, China United Coalbed Methane National Engineering Research Center Co.Ltd., Beijing 100095; PetroChina Coalbed Methane Company Limited, Beijing 100028, ChinaFollow
WANG Chengwang, PetroChina Coalbed Methane Company Limited, Beijing 100028, China; Institute of Engineering and Technology, PetroChina Coalbed Methane Company Limited, Xi’an 710082, ChinaFollow
WANG Hongna, CNPC Exploration Software Co. Ltd., Beijing 100080, China
WANG Yubin, PetroChina Coalbed Methane Company Limited, Beijing 100028, China; Institute of Engineering and Technology, PetroChina Coalbed Methane Company Limited, Xi’an 710082, China
XU Fengyin, China United Coalbed Methane National Engineering Research Center Co.Ltd., Beijing 100095; PetroChina Coalbed Methane Company Limited, Beijing 100028, China
GUO Zhidong, PetroChina Coalbed Methane Company Limited, Beijing 100028, China; Institute of Engineering and Technology, PetroChina Coalbed Methane Company Limited, Xi’an 710082, China
LIU Xinwei, PetroChina Coalbed Methane Company Limited, Beijing 100028, China; Institute of Engineering and Technology, PetroChina Coalbed Methane Company Limited, Xi’an 710082, China

Abstract

The No.8 coal with a buried depth of more than 2 000 m of Lower Permian Taiyuan Formation in Daning-Jixian block, eastern margin of Ordos Basin is the first deep CBM field with an output of 100 billion m³ in China, but the reservoir forming characteristics of deep CBM are still unclear. In this paper, geological information, test and production data are synthetically applied to study the characteristics of deep CBM reservoir formation and evaluation of favorable areas. The results show that the deep coal reservoir in the study area is extensively distributed, with large thickness and high degree of thermal evolution. Two-stage reservoir formation and paleothermal fluid intrusion provide premise for substantial hydrocarbon generation. In addition, fractures and micropores are widely developed in deep coal reservoir, where adsorbed gas and free gas coexistence. The roof and floor are mainly limestone and mudstone, with strong capping ability and free gas preservation conditions. The deep CBM possesses the characteristics of “extensive hydrocarbon generation, high gas content, high saturation, high pressure bound free gas and adsorption gas coexistence”. Originally, twelve geological-engineering double sweet spot identification index systems for deep CBM are established, and three types of geological-engineering sweet spots are identified. Among them, geological engineering class I sweet spot is located in the northwest of the study area, geological engineering class sweet spot is located in the middle of the study area, and geological class Ⅱ engineering class Ⅰ sweet spot is located in the northeast and south of the study area; The flowing well JS-01 implemented in the geological engineering class I sweet spot has a maximum daily gas production of 94 000-97 000 m³, showing a good production potential. The research results effectively guide the optimization of the pilot trial area of deep CBM and the exploration of the first deep CBM field of 100 billion cubic meters in China.

Keywords

deep reservoir, coalbed methane (CBM), reservoir forming characteristic, geo-engineering sweet spot

DOI

10.12363/issn.1001-1986.21.12.0842

Recommended Citation

LI Shuguang, WANG Chengwang, WANG Hongna, et al. (2022) "Reservoir forming characteristics and favorable area evaluation of deep coalbed methane in Daning-Jixian Block," Coal Geology & Exploration: Vol. 50: Iss. 9, Article 8.
DOI: 10.12363/issn.1001-1986.21.12.0842
Available at: https://cge.researchcommons.org/journal/vol50/iss9/8

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