本文選題：沉積相　切入點(diǎn)：層序地層　出處：《中國(guó)礦業(yè)大學(xué)》2015年碩士論文

【摘要】：論文以沉積學(xué)、巖石學(xué)、層序地層學(xué)等學(xué)科的理論和方法為指導(dǎo),通過(guò)對(duì)研究區(qū)野外剖面進(jìn)行觀察取樣并進(jìn)行室內(nèi)試驗(yàn)研究、結(jié)合20余口鉆測(cè)井資料進(jìn)行綜合分析。對(duì)平朔礦區(qū)井工三礦太原組沉積相、層序地層學(xué)等方面進(jìn)行研究。通過(guò)相標(biāo)志研究,在井工三礦太原內(nèi)組識(shí)別出三角洲前緣和三角洲平原2種沉積亞相,8種沉積微相,并總結(jié)了各沉積微相的特征。通過(guò)層序界面、水進(jìn)面、最大水進(jìn)面的識(shí)別,將平朔礦區(qū)石炭二疊含煤巖系分成7個(gè)三級(jí)層序、14個(gè)體系域,建立了全區(qū)層序地層格架。SQ2時(shí)期,LST以水下分流河道和分流間灣為主,TST分流間洼地為主;SQ3時(shí)期,LST以分流河道為主,TST形成有利于9#煤層發(fā)育的泥炭沼澤,高位體系域以分流間灣為主;SQ4時(shí)期,LST主要為分流河道,TST以洪泛平原和泥炭沼澤為主,HST以洪泛平原為主;SQ5時(shí)期,LST發(fā)育分流河道與洪泛平原,TST形成有利于4#煤層發(fā)育的泥炭沼澤。通過(guò)對(duì)連井剖面分析,發(fā)現(xiàn)煤層厚度與砂體厚度呈反比,砂體厚度總體呈現(xiàn)出由西北向東南方向變薄,成熟度呈增高趨勢(shì),反映研究區(qū)太原組時(shí)期的古地理格局呈現(xiàn)西北高東南低,海侵為東南方向一致。選取4#、9#、10#和11#煤層四個(gè)小層進(jìn)行全區(qū)對(duì)比,研究表明4#、9#和11#煤層為全區(qū)范圍內(nèi)主要可采煤層,均發(fā)育于海侵體系域,總體呈現(xiàn)西北向東南方向厚度增加的趨勢(shì)。
[Abstract]:Guided by the theories and methods of sedimentology, petrology and sequence stratigraphy, the field profile of the study area was observed and sampled, and the laboratory test was carried out, and more than 20 drilling log data were comprehensively analyzed.The sedimentary facies and sequence stratigraphy of Taiyuan formation in Jinggong No.3 Mine of Pingshuo Mine were studied.Through the study of facies markers, two kinds of sedimentary subfacies, delta front and delta plain, were identified in Taiyuan inner formation of Jinggong No.3 Mine, and 8 sedimentary microfacies were identified, and the characteristics of each sedimentary microfacies were summarized.By identifying the sequence interface, water inlet surface and maximum water inlet surface, the Carboniferous coal bearing strata of Pingshuo mining area are divided into 7 third-order sequences and 14 system tracts.The sequence stratigraphic framework of the whole area was established in the period of Sequential stratigraphy. SQ2. In the period of LST, the subaqueous distributary channel and the interdistributary bay were the main submersible channel and the interdistributary depression was dominated by TST in SQ3 period.LST in high system tract is mainly composed of distributary channel TST mainly flood plain and peat swamp in SQ4 period. LST developed distributary channel and flood plain TST formed peat swamp favorable to coal seam development in SQ5 period.Through the analysis of continuous well profile, it is found that the thickness of coal seam is inversely proportional to the thickness of sand body, and the thickness of sand body is thinning from northwest to southeast, and the maturity of sand body is increasing.The paleogeographic pattern of Taiyuan formation in the study area is high, southeast and low in northwest, and the transgression is consistent in southeast direction.The four sublayers of 4 #Li 9 #jiao 10# and 1 1# coal seam were selected for the whole area comparison. The results show that the 4 #jiao9# and 11# coal seams are the main mineable coal seams in the whole area, which are developed in the transgression system tract, and generally show the trend of increasing the thickness from the northwest to the southeast.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.11;P539.2

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本文編號(hào)：1695023