本文關(guān)鍵詞： 準(zhǔn)噶爾盆地東部 煤層氣 低煤階 成藏模式 資源評價 有利區(qū)優(yōu)選　出處：《中國地質(zhì)大學(xué)(北京)》2016年博士論文　論文類型：學(xué)位論文

【摘要】：準(zhǔn)噶爾盆地東部地區(qū)主要發(fā)育褐煤及長焰煤,蘊含豐富的煤層氣資源,為中國低階煤層氣資源重點勘探目標(biāo)區(qū)。但由于該區(qū)受多期構(gòu)造運動控制,煤層發(fā)育條件比較復(fù)雜,煤層氣成藏條件與富集機理認(rèn)識不清,為下一步煤層氣勘探部署增加了難度。本文以準(zhǔn)噶爾盆地東部地區(qū)侏羅系煤系地層為研究對象,通過開展含煤區(qū)基礎(chǔ)地質(zhì)、成煤環(huán)境、煤儲層發(fā)育特征以及控制因素研究,建立了相應(yīng)的成藏模式;在此基礎(chǔ)上,通過相應(yīng)的數(shù)學(xué)方法開展煤層氣資源計算,并建立煤層氣有利區(qū)優(yōu)選評價體系。主要成果及認(rèn)識如下:(1)準(zhǔn)東地區(qū)位于克拉美麗山與博格達(dá)山之間,在多期構(gòu)造運動的共同作用下,形成凸凹相間的“棋盤”狀構(gòu)造格局。盆地構(gòu)造演化及現(xiàn)今構(gòu)造格局對該區(qū)煤層發(fā)育以及煤層氣富集成藏的控制作用顯著。燕山運動以來,準(zhǔn)東地區(qū)在周緣擠壓和壓扭應(yīng)力場作用下持續(xù)隆升,較淺的埋深導(dǎo)致煤層煤化作用程度較低,熱成因生烴作用嚴(yán)重受限;此外,后期構(gòu)造抬升作用造成含煤層系蓋層剝蝕嚴(yán)重,不利于煤層氣富集保存。(2)準(zhǔn)東地區(qū)中-下侏羅統(tǒng)西山窯組與八道灣組的宏觀煤巖類型及煤變質(zhì)程度均差異較大,且前者煤巖孔隙類型以大孔為主,微小孔基本不發(fā)育,后者則以微小孔為主;較大的孔隙直徑及相對較淺的埋深導(dǎo)致西山窯組煤孔滲條件優(yōu)于八道灣組。此外,八道灣組煤巖蘭氏體積大于西山窯組,但蘭氏壓力值卻相反。(3)基于準(zhǔn)東地區(qū)煤層氣成藏地質(zhì)控制作用,并結(jié)合相應(yīng)的煤層氣成藏實例分析,建立了三種準(zhǔn)東地區(qū)煤層氣富集成藏模式,分別為南部山前帶富集模式、深部凹陷富集模式以及開放斜坡逸散模式。(4)利用體積法計算求得準(zhǔn)東地區(qū)西山窯組煤層氣資源量約為1596.82億m3,可采資源量1223.43億m3,地質(zhì)豐度0.45億m3/km2,可采豐度0.34億m3/km2。此外,運用模糊數(shù)學(xué)層次分析法對煤層氣選區(qū)關(guān)鍵要素進行定量排序,建立煤層氣選區(qū)評價標(biāo)準(zhǔn),優(yōu)選該區(qū)西部地區(qū)為下一步煤層氣勘探的重點目標(biāo)區(qū)。
[Abstract]:Lignite and long flame coal are mainly developed in the eastern part of Junggar Basin, which contains abundant coal bed methane resources and is the key exploration target area for low rank coal bed methane resources in China. However, because the area is controlled by multi-stage tectonic movement, the development conditions of coal seam are quite complex. The formation conditions and accumulation mechanism of coalbed methane (CBM) are not clear, which makes it more difficult for the next CBM exploration to be deployed. In this paper, the Jurassic coal series strata in the eastern area of Junggar Basin are taken as the research object, and the coal-forming environment is obtained by developing the basic geology of the coal-bearing area. Based on the study of the characteristics of coal reservoir development and the controlling factors, the corresponding reservoir forming model is established, and the calculation of coalbed methane resources is carried out through the corresponding mathematical method. The main achievements and understanding are as follows: (1) the Zhongnong area is located between the Karim Mountain and the Bogda Mountains, and under the joint action of the multi-stage tectonic movement, The tectonic evolution of the basin and the present tectonic framework control the coal seam development and coalbed methane accumulation in this area. Since the Yanshanian movement, Due to the continuous uplift of coal seams under the action of compression and compression and torsional stress field, the coal seam coalification is low and the thermal hydrocarbon generation is severely limited, in addition, the late tectonic uplift results in serious denudation of the coal bed cap. In the middle and lower Jurassic Xishanyao formation and Badaowan formation, the macroscopic coal rock types and the coal metamorphic degree of the middle and lower Jurassic Xishanyao formation and the Badaowan formation are all different, and the porosity types of the former coal rocks are dominated by large pores, and the micropores are basically not developed. The latter is dominated by tiny pores, the larger pore diameter and relatively shallow burying depth result in better pore and permeability conditions in Xishanyao formation than in Badaowan formation. In addition, the coal rock of Badaowan formation is larger than that of Xishanyao formation. On the basis of geological control of coalbed methane accumulation in Zhundong area and the analysis of corresponding coalbed methane reservoir forming examples, three types of coalbed methane rich integrated reservoir models in Zhundong area are established, which are the enrichment models of the southern mountain front belt, respectively. The enrichment model of deep sag and the escape model of open slope. 4) by using volume method, the CBM resources of Xishanyao formation in Zhundong area are estimated to be about one hundred and fifty-nine billion six hundred and eighty-two million m3, recoverable resources one hundred and twenty-two billion three hundred and forty-three million m3, geological abundance 45 million m3 / km2, recoverable abundance 34 million m3 / km2.In addition, it is found that the coalbed methane resources of Xishanyao formation are about one hundred and fifty-nine billion six hundred and eighty-two million m3, one hundred and twenty-two billion three hundred and forty-three million m3, 45 million m3 / km 2, and 34 million m3 / km 2, respectively. By using fuzzy analytic hierarchy process (AHP), the key elements of CBM district are quantitatively sorted, the evaluation standard of CBM selection is established, and the western region of this area is chosen as the next key target area for CBM exploration.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：P618.13

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