Gas-bearing evaluation of deep coal rock in the Yan’an gas field of the Ordos Basin

IF 2 3区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Frontiers in Earth Science Pub Date : 2024-09-11 DOI:10.3389/feart.2024.1438834

Yongping Wan, Zhenchuan Wang, Dengping Hu, Ye Wang, Mengxia Huo, Xiaoyan Mu, Shuangbiao Han

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Abstract

The Yan’an gas field in the Ordos Basin is a typical deep coalbed methane field with tremendous resource potential. Evaluation methods for gas content in deep coal seams are urgently required to be established. This study is aimed at quantitatively analyzing the gas content of coalbed methane in deep coalbed methane reservoirs and revealing its influencing factors. With the coal rock samples of typical deep coalbed methane wells in the Yan’an gas field of the Ordos Basin as the research objects, the gas-bearing characteristics of deep coal rocks were analyzed, and the main controlling factors of gas-bearing properties were explored. The research results indicate that (1) the deep coal seams in the Yan’an gas field have a considerable thickness, a high total organic carbon content, and the potential of pyrolysis hydrocarbon generation is generally elevated, presenting excellent hydrocarbon generation potential. (2) Various types of pores and fractures in the deep coal rocks of the Yan’an gas field are well-developed, providing a favorable preservation space and migration channel for deep coalbed methane. (3) The total gas content of on-site analysis of deep coalbed methane in the Yan’an gas field is relatively high, mainly existing in the form of free gas, and has significant exploration and development potential. (4) The gas content of deep coal rocks in the Yan’an gas field is jointly controlled by multiple factors such as the total organic carbon content, minerals, and pore structure. In conclusion, the deep coal seams in the Yan’an gas field have favorable reservoir-forming conditions and great exploration and development potential.

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鄂尔多斯盆地延安气田深部煤岩含气评价

鄂尔多斯盆地的延安气田是典型的深层煤层气田，资源潜力巨大。深部煤层瓦斯含量评价方法亟待建立。本研究旨在定量分析深部煤层气储层中煤层气的含气量，并揭示其影响因素。以鄂尔多斯盆地延安气田典型深部煤层气井的煤岩样品为研究对象，分析了深部煤岩的含气特征，探讨了含气性质的主要控制因素。研究结果表明：（1）延安气田深部煤层厚度较大，总有机碳含量较高，热解生烃潜力普遍较高，具有良好的生烃潜力。(2）延安气田深部煤岩中各类孔隙和裂缝发育，为深部煤层气提供了有利的保存空间和运移通道。(3）延安气田深部煤层气现场分析总瓦斯含量较高，主要以游离瓦斯形式存在，具有较大的勘探开发潜力。(4）延安气田深部煤岩的瓦斯含量受有机碳总量、矿物质、孔隙结构等多种因素的共同控制。综上所述，延安气田深部煤层具有良好的成藏条件，勘探开发潜力巨大。

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来源期刊

Frontiers in Earth Science Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

3.50

自引率

10.30%

发文量

2076

审稿时长

12 weeks

期刊介绍： Frontiers in Earth Science is an open-access journal that aims to bring together and publish on a single platform the best research dedicated to our planet. This platform hosts the rapidly growing and continuously expanding domains in Earth Science, involving the lithosphere (including the geosciences spectrum), the hydrosphere (including marine geosciences and hydrology, complementing the existing Frontiers journal on Marine Science) and the atmosphere (including meteorology and climatology). As such, Frontiers in Earth Science focuses on the countless processes operating within and among the major spheres constituting our planet. In turn, the understanding of these processes provides the theoretical background to better use the available resources and to face the major environmental challenges (including earthquakes, tsunamis, eruptions, floods, landslides, climate changes, extreme meteorological events): this is where interdependent processes meet, requiring a holistic view to better live on and with our planet. The journal welcomes outstanding contributions in any domain of Earth Science. The open-access model developed by Frontiers offers a fast, efficient, timely and dynamic alternative to traditional publication formats. The journal has 20 specialty sections at the first tier, each acting as an independent journal with a full editorial board. The traditional peer-review process is adapted to guarantee fairness and efficiency using a thorough paperless process, with real-time author-reviewer-editor interactions, collaborative reviewer mandates to maximize quality, and reviewer disclosure after article acceptance. While maintaining a rigorous peer-review, this system allows for a process whereby accepted articles are published online on average 90 days after submission. General Commentary articles as well as Book Reviews in Frontiers in Earth Science are only accepted upon invitation.