【作者】 冯明石；

【导师】 刘家铎；

【作者基本信息】 成都理工大学 ， 矿物学、岩石学、矿床学， 2009， 硕士

【摘要】 本文以沉积学、高分辨率层序地层学为理论基础,运用地质、测井、地震等多学科分析手段,对四川盆地中西部地区上三叠统须家河组沉积体系、高分辨率层序地层学、岩相古地理、储层特征以及层序格架内储层分布等进行了研究。在前人研究基础之上,综合区域大地构造和沉积背景,通过野外露头剖面、岩芯观察,以及录井、地震和测井资料的研究,将四川盆地中西部地区上三叠统须家河组沉积体系划分为3类沉积体系组、6类沉积体系、17个沉积亚相和46个沉积微相。深入讨论了沉积相、亚相和微相的特征,建立了研究区上三叠统须家河组沉积模式。本文运用高分辨率层序地层学研究方法,在地震层序分析的基础上,将研究区上三叠统须家河组划分出4个长期、10个中期和数十个短期旋回层序,搭建了四川盆地中西部地区上三叠统须家河组层序地层格架,并深入探讨了各级层序特征。以中期旋回层序为编图单元,编制了四川盆地中西部地区上三叠统须家河组层序-岩相古地理图,详细描述了MSC01～MSC10各中期旋回层序岩相古地理特征及其演化。通过铸体薄片、扫描电镜、物性分析等研究手段对研究区须家河组储层特征进行研究,并总结出研究区上三叠统须家河组储层发育的沉积体系主要为辨状河三角洲,储集砂体主要为三角洲前缘水下分流河道和河口坝微相,主要位于MSC02、MSC03、MSC05、MSC06、MSC09中期旋回。最后,根据对沉积体系、层序地层与储层分布关系研究,结合勘探成果,对研究区有利储层分布进行了预测。更多还原

【Abstract】 Based on the theories of sedimentology and high-resolution sequence stratigraphy, this paper researchs the sedimentary system, high-resolution sequence stratigraphy, sequence-based lithofacies-paleogeography, reservoir characteristics and reservoir distribution in sequence stratigraphic framework of the Xujiahe Formation of the Upper Triassic in Central and Western Sichuan basin by using geologic, logging and seismic methods.On the basis of previous research, by comprehensively analysing the regional geotectonic setting and sedimentary setting data, observing outcrop and core, and then investigating geological, logging and seismic profile, this paper divids the sedimentary system of the Xujiahe Formation into 3 types of sedimentary system groups, 6 types of sedimentary systems, 17 sedimentary subfacies and 46 sedimentary microfacies. It deeply investigates the characteristics of sedimentary facies, sedimentary subfacies and sedimentary microfacies, and establishs the sedimentary models.On the basis of analysis on seismic sequence, this paper divids the Xujiahe Formation into 4 long-term sequence cycles,10 middle-term sequence cycles,and tens of short-term sequence cycles. It establishs sequence stratigraphic framework of the Xujiahe Formation of the Upper Triassic in study area,and also deeply investigates the characteristics of all levels sequence.The sequence-based lithofacies-paleogeographic maps of the Xujiahe Formation of the Upper Triassic in study area are compiled by choosing middle-term sequence cycles as the isochronous mapping unit. This paper demonstrats in details the characteristics of lithofacies aleogeography and their evolution during different middle-term sequence cycles development from MSC01 to MSC10.The reservoir characteristics of the Xujiahe Formation in study area are investigated by many such scientific means as the casting thin sections observation, scanning electron microscope and physical property analysis. This paper concludes that sedimentary system developed in the Xujiahe Formation reservoir in the study area is dominantly braided river delta. The reservoir sandstone is dominantly underwater distributary channel and mouth bar microfacies of braid river deltas front. Reservoir is developed in the middle-term sequence cycles of MSC02, MSC03, MSC05, MSC06 and MSC09.Favorable reservoir distribution in the study area is forecasted in this paper by combining previous exploration with the study of sedimentary system, sequence stratigraphy and their relationship with reservoir distribution.更多还原