郭家河井田煤层气富集主控因素与富集区预测研究
发布时间：2018-12-27 08:11
【摘要】：煤层气既是一种重要的清洁能源,也是一种造成煤矿瓦斯灾害的气体。加快煤层气开发利用,对于防治煤矿瓦斯灾害、利用洁净能源、保护大气环境具有重要意义。以往对煤层气的主控因素和富集区预测虽然做了大量研究,但煤层气实际抽采中往往因富集因素不清、富集区不明而使抽采效果较差,因此深入开展煤层气富集主控因和富集区预测研究仍然是当前的重要任务。本文以陕西黄陇侏罗纪煤田永陇矿区郭家河井田为研究区,以侏罗系延安组主要可采煤层3号煤的煤层气为研究对象,应用沉积岩石学、构造地质学、瓦斯地质学以及水文地质学等相关理论,在整理郭家河井田地质勘探、矿井生产阶段与煤层气有关地质资料的基础上,结合瓦斯含量测试等方面的资料,从煤储层的沉积学特征、宏观与微观煤岩类型、煤质特征、渗透性、吸附特性以及含气性等方面对3号煤储层特征进行了深入分析,认为井田内3号煤层渗透性差,属于特低渗储层,煤层吸附能力强,不易解析,气含量分布不均,井田中部Ⅱ盘区气含量相对最高。从煤层及其顶底板岩性特征、煤变质程度、地质构造以及水文地质条件等4方面,分析了煤层厚度、煤层埋深、上覆基岩厚度、煤层顶底板岩性、变质程度、断层、褶皱以及水文地质条件等8个因素对煤层气富集的影响,运用灰色关联分析方法研究确定了研究区煤层气富集的主控因素,认为断层、褶皱、上覆基岩厚度与煤变质程度是井田煤层气富集的主要控制因素,向斜轴部以及背斜翼部有利于形成局部富集区,断层是气体逸散的主要通道而不利于煤层气的富集,上覆基岩厚度越大、煤变质程度越高越有利于煤层气富集。煤层顶板岩性以泥岩为主,且延安组地层与其他含水层不具有水力联系,对煤层气富集有利。在此基础上,应用多元非线性回归理论对煤层气含量进行了预测,建立了主成分-多元非线性回归模型,预测了井田的煤层气含量及分布,并划分出2个煤层气富集区。
[Abstract]:Coalbed methane (CBM) is not only an important clean energy source, but also a gas that causes coal mine gas disaster. Speeding up the exploitation and utilization of coalbed methane is of great significance for preventing and controlling coal mine gas disasters, utilizing clean energy and protecting atmospheric environment. Although a great deal of research has been done on the main control factors of coalbed methane and prediction of rich areas in the past, the extraction effect of coalbed methane in actual extraction and production is often poor because of unclear enrichment factors and unknown rich areas. Therefore, it is still an important task to study the main controlling factors and rich area prediction of coalbed methane enrichment. In this paper, taking the Guojiahe coalfield of the Jurassic coalfield of Huanglong, Shaanxi Province as the research area, and taking the coalbed methane of No. 3 coal seam of Yanan formation of Jurassic system as the research object, the sedimentary petrology and tectonic geology are used. Related theories such as gas geology and hydrogeology, on the basis of collating geological data related to geological exploration in Guojiahe mine field, coal mine production stage and coalbed methane, combined with gas content testing and so on. The characteristics of No. 3 coal reservoir are analyzed in terms of sedimentary characteristics, macroscopic and microscopic coal and rock types, coal quality characteristics, permeability, adsorption characteristics and gas-bearing properties. It is considered that the permeability of No. 3 coal seam in the mine field is poor. It belongs to the ultra-low permeability reservoir, which has strong adsorption ability, is not easy to be analyzed, and the gas content is unevenly distributed, and the gas content is relatively highest in the area 鈪，
本文编号：2392757
[Abstract]:Coalbed methane (CBM) is not only an important clean energy source, but also a gas that causes coal mine gas disaster. Speeding up the exploitation and utilization of coalbed methane is of great significance for preventing and controlling coal mine gas disasters, utilizing clean energy and protecting atmospheric environment. Although a great deal of research has been done on the main control factors of coalbed methane and prediction of rich areas in the past, the extraction effect of coalbed methane in actual extraction and production is often poor because of unclear enrichment factors and unknown rich areas. Therefore, it is still an important task to study the main controlling factors and rich area prediction of coalbed methane enrichment. In this paper, taking the Guojiahe coalfield of the Jurassic coalfield of Huanglong, Shaanxi Province as the research area, and taking the coalbed methane of No. 3 coal seam of Yanan formation of Jurassic system as the research object, the sedimentary petrology and tectonic geology are used. Related theories such as gas geology and hydrogeology, on the basis of collating geological data related to geological exploration in Guojiahe mine field, coal mine production stage and coalbed methane, combined with gas content testing and so on. The characteristics of No. 3 coal reservoir are analyzed in terms of sedimentary characteristics, macroscopic and microscopic coal and rock types, coal quality characteristics, permeability, adsorption characteristics and gas-bearing properties. It is considered that the permeability of No. 3 coal seam in the mine field is poor. It belongs to the ultra-low permeability reservoir, which has strong adsorption ability, is not easy to be analyzed, and the gas content is unevenly distributed, and the gas content is relatively highest in the area 鈪，
本文编号：2392757
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