【作者】 郑杰；

【导师】 孙卫；

【作者基本信息】 西北大学 ， 矿物学、岩石学、矿床学， 2010， 硕士

【摘要】 三塘湖油田牛圈湖区块西山窑组油藏为低孔低渗低压油藏。生产过程中表现出注采反应快,平面、剖面矛盾突出,油井投产后见水很快,水驱效果差,单井产量低。为了改善开发效果,需要通过电镜扫描、铸体薄片、图像孔隙和高压压汞等实验技术,研究储集层的岩石学特征、物性特征、非均质性、成岩作用以及微观孔隙结构特征等。将研究区西山窑组X2层划分为四个小层,自上而下分别为X21小层、X22小层、X23小层和X24小层,沉积相属于扇三角洲前缘亚相沉积。研究区储层砂岩碎屑颗粒组分主要为岩屑,其次为石英和长石类,孔隙度平均值为12.5%,渗透率平均值为1.44×10-3μm2,为低孔特低渗储层。X22小层与X23小层的物性相对较好,X21小层与X24小层的物性相对较差。成岩作用主要发育有压实作用、胶结作用、溶蚀作用以及极少量的交代作用和重结晶作用。研究区储层层间非均质性相对较弱,层内非均质性非常强烈。储层的层间、层内和微观非均质性综合影响着平面非均质性。孔隙类型主要为凝灰质溶孔、粒间孔、长石溶孔和晶间孔,以及极少量的岩屑溶孔和微裂缝。将研究区西山窑组X2层储层划分为三类,从Ⅰ类到Ⅲ类储层的物性逐渐变差,储集能力和渗流能力也变差。更多还原

【Abstract】 Xishanyao formation petroleum reservoir of Niuquanhu area in Santanghu oilfield is low-porosity, low-permeability and low-pressure. It is indicate very short injection/production cycle, strong contradiction between plane and profile, that see the water soon after the oil well production, poor effects of water flooding and low well yield during the production. In order to improve the dejectiovelopment effect, though the scanning electron microscope, casting slice, image pore and high pressure Hg inn, need to study the reservoir rock characteristics, physical properties, heterogeneity, diagenesis, and micro-pore structure.The Xishanyao formation X2 sublayer of the study area are divided into four small sublayers, from top to bottom are the small sublayers of X21, X22, X23and X24. Sedimentary facies of the reservoir is a fan delta front facies. The main components of sandstone of the study area is lithic debris, followed by quartz and feldspar. The average porosity is 12.5% and the average permeability is 1.44×10-3μm2, so it is a low porosity and low permeability reservoirs. The small sublayers of X22 and X23 relatively have good physical properties, the small sublayers of X21 and X24 relatively have poor physical properties. Diagenesis mainly developed with compaction, cementation, corrosion and a small amount of metasomatism and recrystallization. The layers heterogeneity is relatively weak and the intra-heterogeneity is very strong. The reservoir’s layer heterogeneity, intra-and micro-heterogeneity combined effect the surface heterogeneity. Pore type are mainly tuffaceous dissolution pores, intergranular pores, feldspar dissolution porosity, intercrystal pore, and a very small amount of debris dissolution pore and micro-cracks. The X2 sublayer reservoir of Xishanyao formation is divided into three categories. From class one to class three, the reservoir properties are getting bad, and the reservoir capacity and flow capacity variation.更多还原