塔里木盆地西南地区白垩系层序地层及沉积相研究

发布时间：2018-05-01 07:47

本文选题：塔里木盆地西南地区 + 白垩系　；参考：《成都理工大学》2017年硕士论文

【摘要】：本文研究区位于塔里木盆地西南地区,包括喀什坳陷、莎车隆起、叶城-和田坳陷及麦盖提斜坡等四个二级构造单元。研究的目的层为白垩系,包括克孜勒苏群和英吉沙群。根据论文研究内容,以多学科理论为指导,结合国内外碳酸盐岩及层序地层研究现状,在仔细分析薄片、岩芯、钻井、测井、地球化学和地球物理资料的基础上,深入研究目的层的岩石类型、沉积环境、层序地层的关系,分析出塔西南地区白垩系地层有利储集相带。影响塔西南地区白垩系地层的构造运动主要是燕山中期、燕山晚期、喜山早期运动,喜山运动中-晚期发生在古近纪渐新世末期。位于新特提斯洋北缘欧亚大陆南部东缘的塔西南,白垩系下统继承性发育与侏罗系类似的陆相沉积。受同期全球海平面整体上升时期大规模海侵影响,塔西南白垩系上统—古近系始新统乌拉根组主要发育海相沉积。塔西南白垩系海相沉积发育有障壁滨岸以及受海水盐度控制的开阔台地和蒸发台地沉积体系,陆相沉积发育冲积扇—扇三角洲—湖泊沉积体系。以层序地层学为理论基础,结合研究区沉积背景、岩石地层、地震地层综合分析,塔西南地区白垩系共识别出二级层序2个:SSQ1,SSQ2,三级层序3个:KSQ1-KSQ3。在过井剖面和地震相研究的基础上,进行层序格架内沉积相展布及其主控因素研究,确立研究区层序沉积演化模式。最终编制沉积相平面图,并揭示沉积相展布规律。塔西南白垩系层序形成主控要素有构造沉降、海平面变化及古气候条件。构造运动对层序的控制主要表现在对层序界面和对沉积古地貌的影响;海平面的升降控制着三级层序界面的形成与层序内部体系域的演化;古气候的变化则影响着碳酸盐岩台地类型和台缘位置的变迁。综合层序、沉积、储层特征分析认为,塔西南白垩系主要有利储集相带为白垩系下统SSQ1(克孜勒苏群)有利储集相带主要为扇三角洲相平原(冲积扇扇缘)及扇三角洲前缘细砂岩、粉砂岩;白垩系上统KSQ3(依格孜牙组)有利储集相带主要为开阔台地台内滩颗粒灰岩、云岩及垮塌云质灰质角砾岩。储集空间以粒间(溶)孔、粒内(溶)孔及铸模孔、生物骨架孔和晶间(溶)孔等次生孔隙为主。
[Abstract]:The study area is located in the southwest of Tarim Basin and consists of four secondary tectonic units: Kashi depression, Shaqa uplift, Yecheng-Hetian depression and Maigeti slope. The target layer of the study is the Cretaceous system, including the Kezilesu Group and the Ingisha Group. According to the contents of this paper, guided by the multidisciplinary theory, combined with the present research situation of carbonate rock and sequence stratigraphy at home and abroad, on the basis of careful analysis of thin slice, core, drilling, logging, geochemistry and geophysical data, The relationship among the rock types, sedimentary environments and sequence stratigraphy of the target strata is studied, and the favorable reservoir facies zones of the Cretaceous strata in the southwest of the Tarim Basin are analyzed. The tectonic movements that affect the Cretaceous strata in southwest Tarim are mainly the middle Yanshanian late Yanshanian early Himalayan and mid-late Himalayan movements which occurred at the end of the Oligocene Paleogene. Located in the southwest of Tarim on the eastern edge of the Eurasian continent in the northern margin of the New Tethys Ocean, the lower Cretaceous inherited deposits similar to the Jurassic. Under the influence of large-scale transgression during the global sea-level rise period, marine deposits were mainly developed in the Cretaceous to Paleogene Eocene Ulagen formation in southwest Tarim. The marine sediments of Cretaceous in southwest of Tarim have barrier shoreline, open platform and evaporation platform controlled by seawater salinity, and alluvial fan fan delta lacustrine sedimentary system. On the basis of sequence stratigraphy, combined with sedimentary background, lithostratigraphy and seismic stratigraphy in the study area, the Cretaceous series in southwest Tarim area identified two second-order sequences (2: SSQ1 / SSQ2) and three third-order sequences (3: KSQ1-KSQ3). Based on the study of cross well profile and seismic facies, the distribution of sedimentary facies in sequence framework and its main controlling factors are studied, and the evolution model of sequence deposition in the studied area is established. Finally, the sedimentary facies plane map is compiled, and the distribution law of sedimentary facies is revealed. The main factors controlling the formation of Cretaceous sequence in southwest of Tarim Basin are tectonic subsidence, sea level change and paleoclimate conditions. The influence of tectonic movement on sequence interface and sedimentary paleogeomorphology, the rise and fall of sea level control the formation of third-order sequence interface and the evolution of internal system tract of sequence. Paleoclimate change affects carbonate platform type and the change of platform margin position. Comprehensive sequence, sedimentary and reservoir characteristics analysis, The main favorable reservoir facies belt of Cretaceous in southwest of Tarim is SSQ1 (Kizilesu group) favorable reservoir facies belt of Cretaceous, mainly fan delta facies plain (alluvial fan margin) and fan delta front fine sandstone, siltstone; The favorable reservoir facies belt of the Upper Cretaceous KSQ3 (Igariziya formation) is mainly composed of flat granular limestone, dolomite and collapsing dolomitic breccia in the open platform. The reservoir space is mainly composed of intergranular (dissolved) pore, intragranular (dissolved) pore and mold pore, biological skeleton pore and intergranular (dissolved) pore.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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