【摘要】：論文以鉆孔巖芯描述、測井曲線分析和測試分析為基礎(chǔ),對鄂爾多斯聚煤大型盆地榆橫煤田小紀(jì)汗井田中侏羅統(tǒng)延安組沉積相、層序地層進(jìn)行了研究。在層序格架內(nèi),綜合地層厚度、砂巖厚度、泥巖厚度、含砂率和煤層厚度等因素,分析了延安組沉積期不同層序的古地理特征與沉積演化,探討了層序格架內(nèi)聚煤規(guī)律。在研究區(qū)延安組識別出曲流河、辮狀河、三角洲和湖泊4種沉積相、10種亞相、23種微相,總結(jié)了不同沉積相的特征。依據(jù)層序地層學(xué)原理,將研究區(qū)延安組劃分為6個層序、15個體系域,建立了研究區(qū)層序地層格局。層序發(fā)育主要受構(gòu)造升降、湖平面變化、古氣候、沉積物通量與可容納空間等因素控制,構(gòu)造升降是最主要控制因素。以體系域為單位,系統(tǒng)研究了延安組不同沉積期的古地理特征,研究區(qū)延安組沉積期經(jīng)歷了湖泊初始充填、湖泊擴(kuò)張、湖泊萎縮、湖泊萎縮期后等四個階段,建立了延安組沉積相模式�？偨Y(jié)了延安組主要煤層的聚煤規(guī)律,建立了曲流河岸后河漫沼澤、湖灣泥炭沼澤、三角洲前緣分流間灣泥炭沼澤和三角洲平原分流間洼地泥炭沼澤4種聚煤模式;富煤期間為最大水進(jìn)面體系域,最佳富煤帶為井田西及西北部。
[Abstract]:Based on drilling core description, log curve analysis and test analysis, the sedimentary facies and sequence stratigraphy of the middle Jurassic Yanan formation in Yuheng coalfield of Yuheng coalfield, Ordos coal accumulation large scale basin, are studied in this paper. In this paper, the paleogeographic characteristics and sedimentary evolution of different sequences of Yanan formation during sedimentary period are analyzed by synthesizing the factors of stratigraphic thickness, sandstone thickness, mudstone thickness, sand content and coal seam thickness, and the regularity of coal accumulation in sequence framework is discussed. Four kinds of sedimentary facies, including meandering river, braided river, delta and lake, were identified and 23 microfacies of 10 subfacies were identified in Yanan formation, and the characteristics of different sedimentary facies were summarized. According to the principle of sequence stratigraphy, the Yan'an formation in the study area is divided into 6 sequences and 15 system tracts, and the sequence stratigraphic pattern of the study area is established. Sequence development is mainly controlled by such factors as tectonic rise and fall, lake level change, paleoclimate, sediment flux and accommodation space, etc. The paleogeographic characteristics of different sedimentary periods in Yan'an formation were systematically studied in system tracts. The sedimentary period of Yan'an formation in the study area underwent four stages: initial filling of lakes, lake expansion and lake atrophy. The sedimentary facies model of Yan'an formation has been established. This paper summarizes the coal accumulation law of the main coal seams in Yan'an formation, and establishes four coal accumulation models: Houhe Man swamp, Huwan peat marsh, delta front distributary interbay peat swamp and delta plain distributary depression peat swamp. During coal enrichment period, it is the largest water entry system tract, and the best coal rich zone is west and northwest of the mine field.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.11

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