塔北地区晚泥盆世东河砂岩段沉积期岩相古地理分布及演化

发布时间：2018-01-15 20:24

本文关键词：塔北地区晚泥盆世东河砂岩段沉积期岩相古地理分布及演化　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文以古地理学、碎屑岩沉积学等理论为指导,结合岩心、薄片、常规测井等资料,对塔北地区晚泥盆世东河砂岩段地层特征、岩石学特征、沉积相类型及纵横向分布等方面进行了系统研究;通过结合区域地质背景,以地层厚度、砂体厚度、砂地比三个单因素作为重点控制因素,采用冯增昭提出的"单因素分析多因素综合作图法",对塔北地区晚泥盆世东河砂岩段进行了岩相古地理图的绘制,并对东河砂岩段沉积期岩相古地理分布及演化进行了分析。依据岩石及生物特征,结合测井曲线以及沉积大地构造背景,可在前人研究基础上对东河砂岩段地层进行划分。东河砂岩段地层顶、底界限分别以砂岩地层与接触地层的低伽马特征明显区分。东河砂岩段地层在研究区内各地区厚度差异明显,在0-300m之间,反应沉积过程中遭受过较大幅度的构造变化。研究区东河砂岩段主要沉积碎屑岩,其中哈拉哈塘地区、东河塘地区、哈德逊地区东河砂岩段主要为细砂岩沉积物;轮古东地区、草湖地区、轮南地区主要为砾岩、含砾砂岩、中砂岩、细砂岩、粉砂岩、泥质粉砂岩、钙质粉细砂岩、泥岩等岩类沉积物。塔北地区东河砂岩段沉积相类型主要包括浪控滨岸相、潮坪相、冲积扇相等,亚相类型主要包括临滨、前滨、后滨、海岸沙丘、潮上、潮间、潮下、扇中、扇端亚相。自西向东,东河砂岩段沉积相由东、西部无障壁浪控滨岸环境沉积为主的前滨—临滨沉积经过中部未沉积东河砂岩段地层的轮南地区大部地区进行沉积。自北向南,东河砂岩段从未沉积东河砂岩段地层的轮南地区大部地区相变为前滨环境沉积。其它相分布相对较少。通过地层厚度等值线图、砂体厚度等值线图、砂地比等值线图3个单因素图的绘制及分析,建立塔北研究区岩相古地理:远离尖灭线的东河塘-哈拉哈塘地区以及草湖地区东河砂岩沉积期的沉积环境主要为前滨-临滨亚相沉积,靠近尖灭线的哈德逊地区东河砂岩沉积期的沉积环境主要为前滨亚相环境。
[Abstract]:Guided by paleogeography and detrital sedimentology, combined with core, thin slice and conventional logging data, this paper deals with the stratigraphic and petrological characteristics of the Donghe sandstone formation in the late Devonian in the northern part of Tarim Basin. The types of sedimentary facies and their longitudinal and transverse distribution were systematically studied. Combined with the regional geological background, taking three single factors, stratigraphic thickness, sand body thickness and sand / land ratio, as the key control factors, the comprehensive mapping method of single factor analysis and multi-factor analysis was proposed by Feng Zengzhao. The lithofacies paleogeography map of the Donghe sandstone section of the late Devonian in the north of Tarim Basin is drawn, and the distribution and evolution of the lithofacies paleogeography of the Donghe sandstone section during the sedimentary period are analyzed. Combined with logging curve and sedimentary tectonic background, the strata of Donghe sandstone section can be divided on the basis of previous studies. The bottom boundary is distinguished by the low-gamma characteristics of sandstone formation and contact formation respectively. The thickness of Donghe sandstone formation is obviously different from 0-300 m in each area of the study area. The main depositional clastic rocks in the Donghe sandstone section of the study area, including the Harahatang area and the Donghetang area, have been subjected to considerable structural changes during the process of reaction deposition. The Donghe sandstone member in Hudson area is mainly composed of fine sandstone sediments. Luangu East area, Caohu area, Lunnan area are mainly conglomerate, gravel sandstone, medium sandstone, fine sandstone, siltstone, argillaceous siltstone, calcareous silty sand. The sedimentary facies types of Donghe sandstone section in the north of Tarim area are mainly wave-controlled shoreline facies, tidal flat facies and alluvial fan equal. The subfacies types mainly include riparian, foreshore, backshore, coastal dune and upper tide. Intertidal, subtidal, fan end subfacies. From west to east, Donghe sandstone sedimentary facies from east. The foreshore-riparian deposits, which are mainly deposited in the coastal environment without barrier waves, are deposited from north to south in most areas of Lunnan area, where the sandstone formation of Donghe section is not deposited in the central part of the region. The facies in Lunnan area of Donghe sandstone formation have never been depositional. The facies in Lunnan area have changed into foreshore sedimentary environment. The distribution of other facies is relatively few. Through the contour map of formation thickness, the contour map of thickness of sand body is obtained. The drawing and analysis of three single factor maps of the isoline map of sand land ratio. The lithofacies paleogeography in the north of Tarim Basin: the sedimentary environment of Donghe sandstone in Donghetang Hattang area and Caohu area is mainly foreshore-riparian subfacies. The sedimentary environment of Donghe sandstone in the Hudson area is mainly foreshore subfacies.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13;P534.44

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