鄂尔多斯盆地南部奥陶系马家沟组四段沉积相

发布时间：2019-01-09 14:37

【摘要】：鄂尔多斯盆地奥陶系马家沟组近年来多个亿吨级气田的发现,展现其碳酸盐岩储层丰厚的油气资源潜力,但主要集中于马五段。为扩大勘探区域,本文针对马四段沉积相研究方面的不足,主要以沉积岩石学、构造地质学、地球化学等多学科领域的理论和方法为指导,结合该区研究及勘探现状,采用多种技术手段,基于野外剖面、井下岩芯及测井和室内分析鉴定资料,综合分析认为,研究区马家沟组四段主体为碳酸盐岩台地,仅在西、南边缘区发育斜坡-海槽。台地相划分为台坪、洼地、浅滩、潮坪、台地边缘及斜坡等6个亚相带及相应的11个微相；海槽相划为海槽亚相及2个微相。与此同时,在充分研究区内马四段的沉积岩石学特征的基础上建立了各微相的沉积相标志,分析了单井和连井沉积相的纵向演化和横向展布,再现了研究区马家沟组四段岩相古地理面貌。在此基础上,建立了研究区马四时期沉积模式。
[Abstract]:In recent years, the discovery of several hundred million dwt gas fields in the Ordovician Majiagou formation in Ordos Basin shows the rich oil and gas resource potential of its carbonate reservoir, but it is mainly concentrated in the Ma Wu formation. In order to expand the exploration area, this paper aims at the deficiency in the study of sedimentary facies of the fourth member of Ma, mainly guided by the theories and methods in the fields of sedimentary petrology, tectonic geology, geochemistry and so on, combined with the present situation of research and exploration in this area. Based on field profile, core, logging and laboratory analysis data, it is considered that the main body of the fourth member of Majiagou formation in the study area is carbonate platform, and only the slope and trough are developed in the west and south margin. The platform facies are divided into 6 subfacies zones, such as platform, depression, shoal, tidal flat, platform margin and slope, and the trough facies are divided into trough subfacies and 2 microfacies. At the same time, the sedimentary facies markers of each microfacies are established on the basis of a full study of the sedimentary petrological characteristics of the fourth member in the area, and the longitudinal evolution and horizontal distribution of the single and connected well sedimentary facies are analyzed. The lithofacies paleogeography of the fourth member of the Majiagou formation in the study area is reproduced. On the basis of this, the sedimentary model of Ma 4 period in the study area was established.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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