东营凹陷太古界基岩储层成因研究

发布时间：2018-05-13 02:04

本文选题：太古界储层 + 裂缝储层　；参考：《西南石油大学》2015年硕士论文

【摘要】：本文对东营凹陷太古界的主要储集岩类及组合、储集空间类型、物性和孔隙结构等储层特征进行定性和定量研究,并开展储集岩储集空间成因机制研究,明确储层特征与岩性、岩浆侵入、混合岩化作用、构造断裂活动和物理风化作用等之间的关系,且进行储集空间形成期次的划分,确定影响潜山储层形成与分布的主要控制因素。首先,本区古潜山储层以孔洞复合型和裂缝孔隙型储层为主,所划分的四类储层中,I类储层为优质储层,其孔隙度大于10%,渗透率大于10×10-3μm2。从储集岩类型上看,研究区储集岩主要为花岗岩类(约占60.1%)、闪长岩类(16.2%)。从储集空间类型及特征上看,研究区层段储集空间以各类裂缝为主,主要为高角度构造缝,大多被充填,宽度0.5-2mmm不等,缝间距多小于2cm。从储层物性上看,储层孔隙度大多数小于10%,渗透率总体小于10×10-3μm2,储集岩总体属于低孔低渗岩层。其次,岩浆作用、构造作用和风化作用是本区储层形成的主要原因。形成于25亿年前的太古界结晶基底和在4.5亿年前发生的一次岩浆侵入构成了现今东营凹陷太古界基岩储层的花岗岩类基底。东营凹陷北部潜山带的几条近东西向断层自中生代末至第四纪长期处于张裂活动,与此同时,研究区太古界顶面长期遭受风化剥蚀,形成了各类裂缝与孔隙,大大增加了储层的储集性能。此外,研究区太古代岩石经历了漫长的地质演化。太古界储层岩石为新太古代中晚期岩浆侵入包裹原变质岩,后又经过至少2期岩浆侵入,同时接受区域变质、构造破碎、风化淋滤、湖水溶蚀等作用的改造,形成了大量以各类裂缝为主的次生储集空间。最后,本文根据成因和控制因素的分析,以岩性为根本影响因素,构造破碎为最主要控制因素,结合岩浆侵入、物理风化、大气淡水淋滤、深层溶解作用等次要控制因素,总结出储层的演化模式。
[Abstract]:In this paper, the main reservoir types and assemblages, reservoir space types, physical properties and pore structure of the Archaean in Dongying depression are studied qualitatively and quantitatively, and the formation mechanism of reservoir space is studied to make clear the reservoir characteristics and lithology. The relationship between magmatic intrusion, migmatization, tectonic fault activity and physical weathering, and the division of reservoir space formation stages to determine the main controlling factors affecting the formation and distribution of buried hill reservoir. First of all, the reservoir of buried hill in this area is mainly composed of porosity and fracture porosity. Among the four types of reservoirs, the type I reservoir is of high quality, its porosity is greater than 10 脳 10 ~ (-3) 渭 m ~ (2) and its permeability is more than 10 脳 10 ~ (-3) 渭 m ~ (2). The reservoir rocks in the study area are mainly granite (60.1%) and diorite (16.2g). In terms of the types and characteristics of reservoir space, the reservoir space of the study area is mainly composed of various fractures, mainly high angle structural fractures, mostly filled with 0.5-2mmm of different width and less than 2 cm. In terms of reservoir physical properties, most of the reservoir porosity is less than 10%, the permeability is less than 10 脳 10 -3 渭 m 2, and the reservoir rock belongs to low porosity and low permeability rock. Secondly, magmatism, tectonism and weathering are the main reasons for reservoir formation. The Archean crystalline basement formed 2.5 billion years ago and a magmatic intrusion occurred 450 million years ago formed the granitic basement of the Archean bedrock reservoir in Dongying depression. Several near-east-west faults in the buried hill belt in the north of Dongying Sag have been in the long period of tension from the late Mesozoic to the Quaternary. At the same time, the top of the Archean in the study area has been weathered and denudated for a long time, resulting in various fractures and pores. The reservoir performance is greatly improved. In addition, Archean rocks have undergone a long geological evolution in the study area. The Archean reservoir rocks were formed by magmatic intrusions in the late NeoArchean period surrounding the original metamorphic rocks, and then underwent at least two periods of magmatic intrusion, and at the same time underwent the transformation of regional metamorphism, structural fragmentation, weathering and leaching, and lake water dissolution, etc. A large number of secondary reservoir spaces with various fractures are formed. Finally, according to the analysis of genesis and control factors, the paper takes lithology as the basic influencing factor, structural fragmentation as the most important controlling factor, combined with the secondary control factors such as magmatic intrusion, physical weathering, atmospheric fresh water leaching, deep dissolution and so on. The evolution model of reservoir is summarized.
【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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