【作者】 付锁堂；

【导师】 陈洪德；

【作者基本信息】 成都理工大学 ， 古生物学与地层学， 2004， 博士

【摘要】 鄂尔多斯盆地是中国天然气勘探最有潜力的盆地之一,鄂北地区是目前上古生界天然气气藏分布的主要地区。针对上古生界天然气气藏具有低孔、低渗、低丰度、大面积分布、非均质性强等隐蔽性气藏的特点,通过以沉积学、层序地层学的理论及研究方法为基础,以岩芯、测井、野外剖面资料为主要研究对象,结合地震解译、试气及开采结果,重点研究该区的沉积体系特征,地层及层序的划分与对比,不同级别层序的结构特征、形成条件、岩性岩相组成和分布特点,岩相古地理演化特征,重点区块的砂体展布特征,进而探讨气藏形成及分布的主要控制因素,最终为鄂尔多斯盆地气藏的进一步勘探与开发提供重要基础资料,同时也为其他地区相类似油气藏的勘探与开发提供重要参考,并且也将为丰富隐蔽性气藏研究、陆相层序地层学研究的理论基础和实践运用起到重要的作用。 通过以上研究,本论文在下述方面取得了重要进展和创新: 通过对露头和钻井岩性剖面、测井曲线的详细观测、描述和对比分析,依据岩石组合、沉积组构、剖面结构和演化序列,将研究区上石炭统本溪组至二叠系石盒子组划分为3个沉积体系组、6个沉积体系、9个沉积相和众多的亚相、微相类型。其中冲积扇、辫状河、湖泊三角洲是本区最重要的沉积类型,特别以三角洲平原亚相发育最广泛。 本论文依据以Cross的基准面旋回为指导思想的高分辨率层序地层学理论和方法,确定了研究区组以下地层的划分对比标准和原则。详细研究了不同级别界面类型和特征,从而总结出该区地层层序界面划分的五个成因级别和三类测井相组合类型。 以地表露头、钻井岩芯和测井剖面的精细沉积相和高分辨率层序地层分析为依据,综合已有的众多研究成果,首次对鄂尔多斯北部盆地上石炭统太原组至中二叠统下石盒子组的年代地层和层序地层划分与对比进行了研究,从而划分出3个超长期(SLSC1～SLSC3)、8个长期(LSC1～LSC8)、1 7个中期(MSC1～MSC17)和数十个短期旋回层序。精细对比研究了短期、中期及长更多还原

【Abstract】 Ordos basin is one of the most potential gas reservoir region in China and Upper Paleozoic is the important exploration horizon. Aiming at the character of low pore, low permeability, low abundance, wide distribution and distinct heterogeneous attribute of subtle gas reservoirs, we apply the basic theories and methods of Sedimentolgy and Sequence Stratigraphy, and use data of core, well logging, field section combining with results of seismic interpretation and testing gas or exploitation to research sedimentary system character, strata and sequence division and correlation, sandstones distribution character in main area of North Ordos Region, in order to discussing main control factor of forming and distribution character of gas reservoir in this region, and offering important basic data to farther gas exploration and exploitation in Ordos Basin. At the same time, these research results have the important effect to theory research and practical exercise of subtle gas reservoirs and sequence stratigraphy.By the above research, we acquire the following important advance and innovation:By the observation, description and correlation of outcrop and well lithologic section and research of rock association, sedimentary petrofabric, section structure and evolution sequence, we divide strata of Benxi formation in the upper Carbonic to Shihezi formation in Permian into three kinds of sedimentary system association, six kinds of sedimentary system, nine kinds of sedimentary facies and many kinds of subfacies and microfacies. The important sedimentary types in this region are alluvial fan, braided rive and lake delta, and delta plain is the widest distributing sedimentary subfacies.According to the theory and method of high resolution sequence stratigraphy which is based on the base level cycle putting forward by Cross, we define the division and correlation standard and principle of srata grading below formation in this region. At the same time, we research type and character of different grade interface, and conclude five genetic grade of division and three kinds of well logging facies association of sequence stratigrapy interface.Based on analysis of fine sedimentary facies and high resolution sequence stratigraphy to outcrops, well loggings, cores and combining with other research results, we first divide and correlate the chronology strata and sequence strata of Taiyuan formation in the Upper Carbonic to Xiashihezi formation in the middle Permian, and divide them into three supper long sequence cycles (SLSC1-SLSC3), eight long sequence cycles (LSC1-LSC8), seventeen middle sequence更多还原