本文關(guān)鍵詞： 新景煤礦 構(gòu)造特征 構(gòu)造煤 分布規(guī)律 瓦斯特性 瓦斯賦存　出處：《中國礦業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本文在系統(tǒng)分析礦井構(gòu)造特征及其發(fā)育規(guī)律的基礎(chǔ)上,結(jié)合區(qū)域構(gòu)造特征及其演化,利用鉆孔測井曲線對3號煤層煤體結(jié)構(gòu)進行判識,討論了新景煤礦不同類型構(gòu)造煤宏、微觀變形特征及其發(fā)育的主控地質(zhì)因素;同時選取典型構(gòu)造煤樣品進行壓汞實驗測試,分析其孔隙性特征;最后結(jié)合煤層瓦斯含量、構(gòu)造曲率以及構(gòu)造煤分布規(guī)律等,探討了新景煤礦瓦斯賦存的影響因素,取得了以下主要研究成果。(1)新景煤礦含煤地層形成以后主要經(jīng)歷了印支期NS向擠壓、燕山期EW向至NWW-SEE向的擠壓以及喜馬拉雅期NNE-SSW向擠壓三期構(gòu)造應(yīng)力作用,不同時期形成的構(gòu)造形跡相互疊加和改造,形成穹窿、盆形以及鞍狀等構(gòu)造。(2)新景煤礦構(gòu)造煤類型發(fā)育較為齊全,碎裂煤、碎斑煤、碎粒煤、鱗片煤、揉皺煤和糜棱煤均可見到。不同構(gòu)造煤類型形成于不同的應(yīng)力-應(yīng)變環(huán)境,在宏、微觀變形特征上表現(xiàn)出特有的變形特征。構(gòu)造煤的發(fā)育主要受到褶皺構(gòu)造以及小構(gòu)造影響。(3)運用聚類分析的方法將3號煤層煤體結(jié)構(gòu)劃分為三大類,并總結(jié)了各自測井曲線變化特征,對3號煤層煤體結(jié)構(gòu)進行了判識和分層定厚。提出和定義了鉆孔煤體結(jié)構(gòu)破壞值,結(jié)合Ⅱ類煤和Ⅲ類煤百分比等值線圖以及煤體結(jié)構(gòu)破壞值等值線圖,分析了3號煤層煤體結(jié)構(gòu)分布規(guī)律。(4)從壓汞實驗測試數(shù)據(jù)可以看出,不同類型構(gòu)造煤具有不同的孔隙性特征。從原生結(jié)構(gòu)煤-糜棱煤,總孔容、孔隙度以及中值孔徑均呈現(xiàn)先增大后減小的變化趨勢,同類型構(gòu)造煤樣品之間孔比表面積離散性較強,整體變化趨勢不穩(wěn)定。原生結(jié)構(gòu)煤以微孔和過渡孔為主,隨著變形程度的增強,原生孔遭受破壞,微孔所占比例減少,宏觀裂隙和大孔數(shù)量增加。將新景煤礦的構(gòu)造煤壓汞曲線劃分為“平行型”、“尖棱型”、“反S型”和“雙S型”四種孔隙結(jié)構(gòu)類型,代表了四種不同的孔隙形態(tài)及其連通性,對煤層中瓦斯運移、富集產(chǎn)生不同程度影響。(5)影響新景煤礦瓦斯賦存的因素有煤變質(zhì)程度、煤系組合特征、煤層埋藏深度、水文地質(zhì)條件、煤層的后生沖蝕作用等,而礦井構(gòu)造控制下的煤體結(jié)構(gòu)的非均質(zhì)性分布與礦井瓦斯賦存差異性具有一定相關(guān)性。
[Abstract]:On the basis of systematic analysis of mine structure and its development law, combined with regional structural characteristics and evolution, this paper uses borehole logging curve to identify coal body structure of No. 3 coal seam. The characteristics of macro and micro deformation of different types of tectonic coal in Xinjing Coal Mine and the main geological factors controlling their development are discussed. At the same time, the typical structural coal samples were selected for mercury injection test, and the porosity characteristics were analyzed. Finally, combined with coal seam gas content, structural curvature and distribution of structural coal, the influence factors of gas occurrence in Xinjing coal mine are discussed. After the formation of coal-bearing strata in Xinjing coal mine, it mainly experienced NS compression during the Indosinian period. During the Yanshanian EW to NWW-SEE compressions and the Himalayan NNE-SSW compressional third tectonic stress the tectonic traces formed in different periods superimpose and transform each other to form the fornix. Basin-shaped and saddle-shaped tectonics. 2) Xinjing coal mine has a complete development of structural coal types, such as broken coal, broken spot coal, broken grain coal, and squama coal. Different types of tectonic coals are formed in different stress-strain environments in macros. The development of tectonic coal is mainly influenced by fold structure and small structure. The coal body structure of No. 3 coal seam can be divided into three categories by cluster analysis. The characteristics of log curves are summarized, and the structure of coal body in No. 3 coal seam is identified and stratified to determine the thickness. The failure value of coal body structure in borehole is put forward and defined. Combined with the percentage isoline diagram of type 鈪，

本文編號：1443934