Low coal rank coalbed methane accumulation model and exploration direction

被引：0
|
作者：
Huangfu Y. [1 ]
Kang Y. [1 ,2 ]
Deng Z. [3 ]
Li G. [3 ]
Mao D. [4 ,5 ]
Liu H. [3 ]
Zhao Q. [3 ]
Sun T. [1 ]
机构：
[1] College of Geosciences, China University of Petroleum, Beijing
[2] State Key Laboratory of Petroleum Resources and Prospecting, Beijing
[3] PetroChina Research Institute of Petroleum Exploration and Development, Beijing
[4] National Engineering Research Center of Coalbed Methane Development & Utilization, Beijing
[5] National Engineering Research Center of China United Coalbed Methane, Beijing
来源：
Shiyou Xuebao/Acta Petrolei Sinica | 2019年 / 40卷 / 07期
关键词：
Accumulation model; Coalbed methane; Exploration direction; Hydrogeology; Low coal rank; Secondary biogenic gas;
D O I：
10.7623/syxb201907003
中图分类号：
学科分类号：
摘要：
Low coal rank coalbed methane resources are rich in China, but are less known and explored; there is still insufficient understanding of the main controlling factors and enrichment laws of coalbed methane accumulation. Based on analyzing the variation trends in the gas content of low coal rank coalbed methane changing with depths in different basins and blocks worldwide, this paper explores the premise of low coal rank coalbed methane accumulation in terms of the present and ancient hydrogeological conditions, and also analyzes the impact of coal-forming environment on gas content. Research indicates: (1) Low rank coals (Ro<0.65%) are mainly distributed in the Mesozoic and Cenozoic coal measures strata with buried depth<1 200 m, and low rank coalbed methane is mainly dominated by secondary biogenic gas. (2) The gas content of low rank coal tend to increase firstly and then decrease with the buried depth, generally showing an optimal depth. The present hydrogeological conditions of fresh water infiltration or paleo-fresh water infiltration are the preconditions for secondary biogas generation. (3) In addition to the formation and enrichment of low coal rank coalbed methane controlled by hydrogeological conditions for freshwater infiltration, the reservoir characteristics such as coal-rock component, coal seam thickness, coal-rock top lithology and coal-rock physical properties also have an important influence on gas content. (4) Low coal rank coalbed methane presents two accumulation modes, i.e., the Neogene hydrocarbon accumulation in marginal slope zone of the basin and the paleo-accumulation in small fault depressions, indicating two directions of low coal rank coalbed methane exploration. © 2019, Editorial Office of ACTA PETROLEI SINICA. All right reserved.
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页码：786 / 797
页数：11
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