黔西六盤水煤田煤層氣資源特征與有利區(qū)優(yōu)選
本文選題:六盤水煤田 + 多煤層; 參考:《中國礦業(yè)大學(xué)》2017年碩士論文
【摘要】:六盤水煤田煤層氣資源量大,資源豐度高,是我國重要的煤層氣富集區(qū)。但由于該區(qū)是典型的多煤層地區(qū),構(gòu)造煤和高應(yīng)力發(fā)育,煤層氣資源賦存的地質(zhì)條件復(fù)雜多變,使得目前比較常見的選區(qū)方法和選區(qū)指標(biāo)很難在該區(qū)直接應(yīng)用。本論文以六盤水煤田為研究對(duì)象,系統(tǒng)總結(jié)了前人的研究成果,在大量煤田地質(zhì)勘探資料和煤層氣井資料基礎(chǔ)上,結(jié)合實(shí)驗(yàn)室測試分析數(shù)據(jù),對(duì)研究區(qū)資源條件、解吸滲流條件、工程條件以及煤儲(chǔ)層能量展布特征進(jìn)行了系統(tǒng)研究和分析;在此基礎(chǔ)上,運(yùn)用一票否決+遞階優(yōu)選法和煤儲(chǔ)層能量系統(tǒng)法進(jìn)行了煤層氣有利區(qū)優(yōu)選,分析對(duì)比優(yōu)選結(jié)果,提出了一套適合研究區(qū)的多煤層煤層氣地質(zhì)選區(qū)指標(biāo)體系和方法。研究區(qū)構(gòu)造復(fù)雜,整體顯示為中至高地應(yīng)力狀態(tài)、正常—異常高壓的儲(chǔ)層壓力狀態(tài)。區(qū)內(nèi)煤層氣成分主要為甲烷,平均含氣量12.24m3/t,具有明顯的向斜控氣特征,煤層含氣量隨層位呈波動(dòng)性變化,風(fēng)化帶深度大約為150m。采用體積法計(jì)算了13個(gè)主要次級(jí)向斜的煤層氣資源量及資源豐度,分析了資源分布特征。結(jié)果表明,青山向斜、盤關(guān)向斜、格目底向斜、郎岱向斜和土城向斜的煤層氣資源量較大;盤關(guān)向斜、平關(guān)向斜、土城向斜、舊普安向斜、大河邊向斜的煤層氣豐度較高;六枝向斜、楊梅樹向斜、補(bǔ)郎向斜和蟠龍向斜資源量和資源豐度都較低,煤層氣資源條件較差。研究認(rèn)為,在六盤水煤田等多煤層地區(qū)進(jìn)行煤層氣有利區(qū)優(yōu)選時(shí),應(yīng)先采用一票否決+遞階優(yōu)選法,在最大程度保留整個(gè)向斜總體特征的基礎(chǔ)上,將不適合煤層氣開采的向斜排除,優(yōu)選出煤層氣賦存條件較好的向斜;進(jìn)而采用煤儲(chǔ)層能量系統(tǒng)法,在剩余向斜中定量評(píng)價(jià)煤層氣有利區(qū)三元判識(shí)參數(shù),依次選出有利區(qū)、較有利區(qū)和一般區(qū)。評(píng)價(jià)結(jié)果顯示,土城為最有利向斜,格目底和盤關(guān)為較有利向斜,青山、小河邊和舊普安為一般向斜,六枝、郎岱、大河邊、平關(guān)、補(bǔ)郎、蟠龍和楊梅樹等為不利向斜。
[Abstract]:Liupanshui coalfield is an important coalbed methane rich area with large amount of resources and high abundance of resources.However, because this area is a typical multi-seam area, tectonic coal and high stress are developed, and the geological conditions of coalbed methane resources are complex and changeable, it is difficult to apply the common selection method and selection index directly in this area.This paper takes Liupanshui coalfield as the research object, systematically summarizes the previous research results, on the basis of a large number of coalfield geological exploration data and coalbed gas well data, combined with laboratory test and analysis data, the resource conditions of the study area are analyzed.The desorption and percolation conditions, engineering conditions and the characteristics of coal reservoir energy distribution are systematically studied and analyzed.Based on the analysis and comparison of the optimal selection results, a set of index system and method for the geological selection of multi-seam coalbed methane in the study area are put forward.The structure of the study area is complex, the whole shows the medium to high ground stress state, the normal and abnormal high pressure reservoir pressure state.In this area, methane is mainly composed of methane, with an average gas content of 12.24 m3 / t, which has obvious syncline controlled gas characteristics. The gas content of coal seam fluctuates with the horizon, and the depth of weathering zone is about 150 m.The CBM resources and abundance of 13 major secondary synclines were calculated by volume method, and the distribution characteristics of resources were analyzed.The results show that the coalbed methane resources of Qingshan syncline, Panguan syncline, Gmudhi syncline, Langdai syncline and Tucheng syncline are relatively large, the coalbed methane abundance of Panguan syncline, Pingguan syncline, Tucheng syncline, old Puan syncline and big riverside syncline are relatively high.The resources quantity and abundance of Liuzhi syncline, Myrica syncline, Bulong syncline and Panlong syncline are low, and the conditions of CBM resources are poor.It is considered that in the optimal selection of coal-bed methane favorable areas in Liupanshui coalfield and other multi-seam areas, one vote veto hierarchical optimization method should be adopted first, on the basis of preserving the overall characteristics of the whole syncline to the maximum extent.The syncline which is not suitable for coalbed methane exploitation is excluded, and the syncline with better occurrence condition is selected, and then, by using the method of coal reservoir energy system, the ternary identification parameters of favorable areas of coalbed methane are quantitatively evaluated in the residual syncline, and the favorable areas are selected in turn.More favorable area and general area.The evaluation results show that Tucheng is the most favorable syncline, Gmuddy and Panguan are more favorable synclines, Qingshan, Xiaohe edge and Old Puan are general synclines, six branches, Lang Dai, big river, Pingguan, Bulang, Panlong and bayberry trees are unfavorable synclines.
【學(xué)位授予單位】:中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:P618.13
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