【作者】 张文选；

【导师】 苗建宇；

【作者基本信息】 西北大学 ， 矿产普查与勘探， 2011， 硕士

【摘要】 从鄂尔多斯盆地古生界油气勘探开发的现状来看,下古生界碳酸盐岩储集层具非常大的油气藏潜力,位于奥陶系上部的古岩溶风化壳是有利的储集层之一。论文从延长油田对古生界天然气勘探的实际需要出发,以盆地区域资料为背景,充分利用探区内数十口探井的钻井、测井、取芯、分析化验、薄片鉴定等资料,综合了多学科的地质理论知识,采用多种技术分析方法,对研究区奥陶系马家沟五组的碳酸盐岩储层特征及其控制因素做了广泛深入的研究。区内大部分探井钻遇马五5亚段,部分井见马六段地层,是一套区域性的含气层段。属碳酸盐高水位域沉积模式中陆棚上的局限台地—潮坪环境的产物,发育有灰坪、云坪、泥云坪、含膏云坪等沉积微相,其中马五41、马五22、马五13亚段发育硬石膏柱状晶白云岩坪为区内有利的沉积相带。孔、洞、缝是马五段碳酸盐岩储集层的主要储集空间,受岩石类型,沉积环境以及后期的成岩作用控制,这些储集空间之间相互叠加,构成复杂的配置关系,使得其在分布上显示较强的非均质性。另外,受盆地构造演化等因素的影响,储集层在空间展布上表现出一定的差异性。位于渗流带斜坡区的古风化壳发育更好且储集性能好,成为古风化壳中最为有利的储集层发育区。石炭—二叠系煤系地层和奥陶系—二叠系海相灰岩、泥质灰岩、泥岩与煤层构成良好的烃源岩；石盒子组和石千峰组发育的一套横向稳定的以湖相为主的砂泥岩以及本溪组底部,山西组以及太原组的泥岩和奥陶系内部发育的致密灰岩、泥质云岩及膏盐层都是区内含气系统的盖层；良好的生储盖配置关系,为天然气藏的形成提供了最有利的条件。更多还原

【Abstract】 Throughout the Paleozoic of the present situation of oil and gas exploration in Ordos Basin, we discovered that lower Paleozoic carbonate reservoir have a very large potential to found more oil and gas reservoirs and that located in the upper part of the ancient Ordovician of karst weathering crust is one of the beneficial reservoir. The thesis aims at the practical demand of the Paleozoic oil and gas exploration of Yanchang Oilfield..Based on the analysis of regional data and Drilling, logging, coring, laboratory analysis, thin section analysis, etc. and multi-disciplinary knowledge of geological theory, We have done extensive reservoir research on carbonate reservoir characteristics and controlling factors of Majiagou 5 member of study areaMost wells drilled Majiagou 55 sub-member and some have Majiagou 6 member, which is a product of restricted platform-tidal flat facies of high-water carbonate deposition model is a regional gas-bearing, developing a gray floor, clouds flat, mud flat clouds, clouds with cream floor and other microfacies.The gypsodolomite facies of Majiagou 541,522and 513 is favorable sedimentary facies in this area.Pores, caves and cracks is the main reservoir space of Majiagou 5 carbonate reservoir,which superimposed on each other and show a strong heterogeneity.In addition, under the influence of factors such as tectonic evolution, reservoir distribution showed some differences on the spatial.Weathering crust,located vadose zone slope have a better reservoir performance,which is the most favorable reservoir development zone.In this area, there developed good source rocks, which is the coal measure strata of Carboniferous-Permian and marine limestone, argillaceous limestone, mudstone and coal of ordovician-permian, and capping formation which is the lake-based shale of Shihezi and Shiqianfeng, the mudstone of the bottom of Benxi, Taiyuan and Shanxi,and dense limestone, argillaceous dolomite, gypsum layer of Ordovician.Those provides better conditions for the formation of natural gas pool.更多还原