塔里木盆地中央隆起带志留系柯坪塔格组层序地层格架内砂体时空分布规律研究

发布时间：2018-05-31 00:02

本文选题：中央隆起带 + 柯坪塔格组　；参考：《成都理工大学》2015年硕士论文

【摘要】：本论文以塔里木盆地中央隆起带志留系柯坪塔格组为研究对象,以沉积学、层序地层学和储层地质学等多学科理论为指导,在区域构造背景的基础上,宏观分析与微观研究相结合,按照地层演化-层序演化-沉积演化的研究思路,运用岩心、钻井、测井、地震等多种方法相结合,划分单井层序地层,并进行了对比,建立了层序地层格架。进而研究了层序地层格架内柯坪塔格组沉积期沉积相类型特征及沉积相平面展布和垂向演化规律,在上述基础上深入分析了柯坪塔格组层序格架内砂体时空分布规律。在区域构造演化特征分析基础上,建立了柯坪塔格组地层划分方案,并对不同区域的地层展开了对比研究,将研究区柯坪塔格组划分为3个段和7个亚段。充分利用野外露头资料、钻井资料、地震资料,对中央隆起带志留系柯坪塔格组开展了层序地层学研究,划分为1个不完整的二级层序(SSQ1),3个完整的三级层序(SQ1-SQ3)和1个不完整的三级层序(SQ4)。在进行单井层序特征研究、井间层序地层对比的基础上,建立了层序地层格架。充分利用前人资料,结合盆地周缘野外剖面、钻井岩心资料、测井资料和室内测试分析资料,在沉积相标志研究的基础上,根据岩石组合、沉积构造、剖面特征和演化序列,对研究区志留系柯坪塔格组沉积相类型及特征进行了系统研究,识别出潮坪相、陆棚相、三角洲相三个沉积相类型。其中潮坪相进一步划分为潮上、潮间、潮下亚相,陆棚相划分为浅海陆棚亚相,三角洲相划分为三角洲平原亚相、三角洲前缘亚相、前三角洲亚相,进而对柯坪塔格组不同亚段沉积期沉积相平面分布特征进行了分析,建立了柯坪塔格组潮坪-陆棚相沉积模式。综合地层、层序和沉积三方面研究成果,深入分析志留系柯坪塔格组砂体时空分布规律在平面上呈北厚南薄、东厚西薄,结构成熟度北高南低,东高西低,在沉积演化过程中,砂体呈早期薄,晚期厚,结构成熟度早期低,晚期高的特点。
[Abstract]:This paper takes the Silurian Kepingtag formation in the central uplift belt of the Tarim Basin as the research object, and based on the multi-disciplinary theories of sedimentology, sequence stratigraphy and reservoir geology, and on the basis of the regional tectonic background, Combining macro analysis with micro research, according to the research ideas of stratigraphic evolution-sequence evolvement and sedimentary evolution, combining with core, drilling, logging, seismic and other methods, the single well sequence stratigraphy is divided and compared. The sequence stratigraphic framework is established. Furthermore, the characteristics of sedimentary facies types and the distribution and vertical evolution of sedimentary facies in the Kepingtag formation in sequence stratigraphy framework are studied. On the basis of the above, the temporal and spatial distribution of sand bodies in the sequence framework of the Kepingtag formation are deeply analyzed. Based on the analysis of the characteristics of regional tectonic evolution, the stratigraphic division scheme of Kepingtag formation is established, and the stratigraphic correlation of different regions is studied. The Kepingtag formation is divided into three sections and seven subsections. Taking full advantage of outcrop data, drilling data and seismic data, the sequence stratigraphy of the Silurian Kepingtag formation in the central uplift zone has been studied. It is divided into 1 incomplete secondary sequence SSQ1, 3 complete tertiary sequence SQ1-SQ3) and 1 incomplete third order sequence SQ4. Based on the study of single well sequence characteristics and interwell sequence stratigraphic correlation, a sequence stratigraphic framework is established. Making full use of the previous data, combining with the field profile of the margin of the basin, drilling core data, logging data and laboratory test analysis data, on the basis of the study of sedimentary facies markers, according to the rock assemblage, sedimentary structure, profile characteristics and evolution sequence, The types and characteristics of sedimentary facies of Kepingtag formation of Silurian in the study area were systematically studied and three types of sedimentary facies including tidal flat facies continental shelf facies and delta facies were identified. The tidal flat facies are further divided into upper tide, intertidal, subtidal subfacies, shelf facies, shallow sea shelf subfacies, delta facies as delta plain subfacies, delta front subfacies, pre delta subfacies. The distribution characteristics of sedimentary facies in different submember of Kepingtag formation are analyzed, and the sedimentary model of tidal flat and shelf facies of Kepingtag formation is established. Synthesizing the research results of stratigraphy, sequence and sedimentation, the spatiotemporal distribution law of sand body of Kepingtag formation of Silurian is analyzed in depth. In the process of sedimentary evolution, the distribution of sand body in the plane is thick in the north, thick in the east, low in the north, low in the south, low in the east and low in the west. The sand body is thin in early stage, thick in late stage, low in structure maturity early and high in late stage.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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