平朔木瓜界三号井工矿石炭—二叠纪含煤地层层序地层学研究

发布时间：2018-04-01 09:44

本文选题：沉积相　切入点：层序地层　出处：《中国矿业大学》2015年硕士论文

【摘要】：论文以沉积学、岩石学、层序地层学等学科的理论和方法为指导,通过对研究区野外剖面进行观察取样并进行室内试验研究、结合20余口钻测井资料进行综合分析。对平朔矿区井工三矿太原组沉积相、层序地层学等方面进行研究。通过相标志研究,在井工三矿太原内组识别出三角洲前缘和三角洲平原2种沉积亚相,8种沉积微相,并总结了各沉积微相的特征。通过层序界面、水进面、最大水进面的识别,将平朔矿区石炭二叠含煤岩系分成7个三级层序、14个体系域,建立了全区层序地层格架。SQ2时期,LST以水下分流河道和分流间湾为主,TST分流间洼地为主;SQ3时期,LST以分流河道为主,TST形成有利于9#煤层发育的泥炭沼泽,高位体系域以分流间湾为主;SQ4时期,LST主要为分流河道,TST以洪泛平原和泥炭沼泽为主,HST以洪泛平原为主;SQ5时期,LST发育分流河道与洪泛平原,TST形成有利于4#煤层发育的泥炭沼泽。通过对连井剖面分析,发现煤层厚度与砂体厚度呈反比,砂体厚度总体呈现出由西北向东南方向变薄,成熟度呈增高趋势,反映研究区太原组时期的古地理格局呈现西北高东南低,海侵为东南方向一致。选取4#、9#、10#和11#煤层四个小层进行全区对比,研究表明4#、9#和11#煤层为全区范围内主要可采煤层,均发育于海侵体系域,总体呈现西北向东南方向厚度增加的趋势。
[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.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.11;P539.2

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