Enrichment patterns and exploration countermeasures of deep coalbed methane in the Linxing-Shenfu block on the eastern margin of the Ordos Basin

被引：0

作者：

Xu, Changgui ^{[1
]}

Ji, Hongquan ^{[2
]}

Wang, Cunwu ^{[3
]}

Zhu, Xueshen ^{[3
]}

机构：

[1] China National Offshore Oil Corporation, Beijing,100010, China

[2] China United Coalbed Methane Co., Ltd., Beijing,100016, China

[3] CNOOC Research Institute Co., Ltd., Beijing,100028, China

来源：

Meitiandizhi Yu Kantan/Coal Geology and Exploration | 2024年 / 52卷 / 08期

关键词：

Objective] Some insights have been gained into the enrichment and accumulation patterns of deep coalbed methane (CBM) in high-rank coal seams on the eastern margin of the Ordos Basin; represented by the Daning-Jixian block. However; the exploration of deep CBM in medium-rank coal seams in the Linxing-Shenfu block; located in the northern segment of the basin's eastern margin remains in its initial stage; leading to an inaccurate and unclear understanding of the enrichment and accumulation patterns. This necessitates summarizing these patterns to effectively guide deep CBM exploration and exploitation. [Methods] Focusing on the Nos.8 and 9 coal seams of the Taiyuan Formation in the Linxing-Shenfu block; this study investigated the factors controlling source rock - reservoir configuration; along with hydrocarbon generation; occurrence; and accumulation; and the coupling relationships between these factors based on the dual attributes of coals as both source rocks and reservoirs. [Results and Conclusions] Key findings are as follows: (1) The study area exhibits an east-west zoning; consisting of the eastern fault terrace zone and the western gentle zone; with the main body manifesting burial depths exceeding 1 500 m. The Nos.8 and 9 coal seams of the Taiyuan Formation are considerably thick; contain micropores and macropores; and feature moderate maturity and a high gas content in general; suggesting superior accumulation conditions for deep CBM and great potential for resource exploration. (2) The coal seams formed under sedimentary microfacies of mudflats and interdistributary bays display substantial thicknesses; high vitrinite content; and simple structures. With an increase in maturity; these coal seams exhibit increasing gas content; specifically the methane content. The critical adsorption zone of the Nos.8 and 9 coal seams; under the coupled control of temperature-pressure conditions; shows a burial depth of around 1 750 m. CBM enrichment is ensured by the high sealing performance of mudstones; stable tectonic environments; and closed hydrodynamic conditions. (3) Given the differences in geologic conditions of the study area; specific recommendations are proposed in this study. For the western gentle zone; it is necessary to accelerate the exploration of the CBM enrichment zone; expand the exploration around the area with proven reserves; and strengthen research on the compressibility of deep coal seams in the zone; with the purpose of driving large-scale production capacity construction. For the eastern fault terrace zone; it is advisable to conduct a pilot production assessment in the CBM enrichment zone and enhance the research on the transpressive-transtensional transition zone of the Lishi strike-slip fault zone; aiming to reveal new reserves. This study; systematically summarizing the enrichment and accumulation patterns of deep CBM in medium-rank coal seams of the Linxing-Shenfu block; has guided the selection of the optimal CBM accumulation zone; holding positive significance for the efficient exploration and large-scale exploitation of this block. © 2024 Science Press. All rights reserved;

D O I：

10.12363/issn.1001-1986.24.01.0026

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摘要：

引用

页码：1 / 11

共 49 条

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