【摘要】：煤層氣既是一種重要的清潔能源,也是一種造成煤礦瓦斯災(zāi)害的氣體。加快煤層氣開發(fā)利用,對(duì)于防治煤礦瓦斯災(zāi)害、利用潔凈能源、保護(hù)大氣環(huán)境具有重要意義。以往對(duì)煤層氣的主控因素和富集區(qū)預(yù)測雖然做了大量研究,但煤層氣實(shí)際抽采中往往因富集因素不清、富集區(qū)不明而使抽采效果較差,因此深入開展煤層氣富集主控因和富集區(qū)預(yù)測研究仍然是當(dāng)前的重要任務(wù)。本文以陜西黃隴侏羅紀(jì)煤田永隴礦區(qū)郭家河井田為研究區(qū),以侏羅系延安組主要可采煤層3號(hào)煤的煤層氣為研究對(duì)象,應(yīng)用沉積巖石學(xué)、構(gòu)造地質(zhì)學(xué)、瓦斯地質(zhì)學(xué)以及水文地質(zhì)學(xué)等相關(guān)理論,在整理郭家河井田地質(zhì)勘探、礦井生產(chǎn)階段與煤層氣有關(guān)地質(zhì)資料的基礎(chǔ)上,結(jié)合瓦斯含量測試等方面的資料,從煤儲(chǔ)層的沉積學(xué)特征、宏觀與微觀煤巖類型、煤質(zhì)特征、滲透性、吸附特性以及含氣性等方面對(duì)3號(hào)煤儲(chǔ)層特征進(jìn)行了深入分析,認(rèn)為井田內(nèi)3號(hào)煤層滲透性差,屬于特低滲儲(chǔ)層,煤層吸附能力強(qiáng),不易解析,氣含量分布不均,井田中部Ⅱ盤區(qū)氣含量相對(duì)最高。從煤層及其頂?shù)装鍘r性特征、煤變質(zhì)程度、地質(zhì)構(gòu)造以及水文地質(zhì)條件等4方面,分析了煤層厚度、煤層埋深、上覆基巖厚度、煤層頂?shù)装鍘r性、變質(zhì)程度、斷層、褶皺以及水文地質(zhì)條件等8個(gè)因素對(duì)煤層氣富集的影響,運(yùn)用灰色關(guān)聯(lián)分析方法研究確定了研究區(qū)煤層氣富集的主控因素,認(rèn)為斷層、褶皺、上覆基巖厚度與煤變質(zhì)程度是井田煤層氣富集的主要控制因素,向斜軸部以及背斜翼部有利于形成局部富集區(qū),斷層是氣體逸散的主要通道而不利于煤層氣的富集,上覆基巖厚度越大、煤變質(zhì)程度越高越有利于煤層氣富集。煤層頂板巖性以泥巖為主,且延安組地層與其他含水層不具有水力聯(lián)系,對(duì)煤層氣富集有利。在此基礎(chǔ)上,應(yīng)用多元非線性回歸理論對(duì)煤層氣含量進(jìn)行了預(yù)測,建立了主成分-多元非線性回歸模型,預(yù)測了井田的煤層氣含量及分布,并劃分出2個(gè)煤層氣富集區(qū)。
[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，

本文編號(hào)：2392757