苏里格东部地区奥陶系马五5亚段储层特征研究

发布时间：2018-07-03 21:25

  本文选题：马5亚段 + 储层特征　； 参考：《成都理工大学》2015年硕士论文

【摘要】：本文以苏里格东奥陶系马五5亚段储层为研究对象,利用沉积学、碳酸盐岩储层地质学、油层物理学及储层沉积学的基本原理和方法并结合测井资料、铸体薄片、扫描电镜、阴极发光及压汞参数等资料,对马五5亚段的岩石学特征、储集空间特征、成岩作用、储层孔渗关系、储层分类及储层控制因素进行了深入的研究。马5亚段沉积主要处于陆表海台地相,以干旱的潮坪环境为主,该区的沉积相可划分为3大亚相、8个次级沉积亚相类,13种岩性类型。马五5亚段岩石类型多样,通过薄片鉴定以及岩心分析,研究区的碳酸盐岩主要包括颗粒灰岩、残余粒屑白云岩、晶粒白云岩等,其中晶粒白云岩储集性能最好、残余结构白云岩储集性能较好、灰岩和角砾白云岩储集性能最差。马五5亚中主要的储集空间为次生孔隙中的晶间孔和溶洞、缝,而其他次生孔隙出现比较少。以中晶、细晶和粉晶白云岩储层发育最好,物性、孔隙结构和压汞参数都最好,以晶间孔为主要储集空间。通过对区内钻井岩心及薄片资料进行观察和研究,并利用扫描电镜、阴极发光和X衍射分析等测试分析手段,对研究区主要成岩作用类型进行了详细研究,认为本研究区马五5亚段的主要成岩作用有:白云石化作用、去膏化作用和去白云石化作用、压实和压溶作用、硅化作用、溶蚀作用、充填作用、重结晶作用和黄铁矿化作用等。成岩作用对储集空间有着不同的影响,研究表明准同生白云化作用未形成有利孔隙,埋藏白云化作用形成的晶间孔构成了研究层位中的重要储集空间。表生溶蚀作用对研究层位中孔缝的增加非常重要,而埋藏期溶蚀作用由于发生在封闭体系下溶蚀空间发育有限。利用岩石薄片,岩石铸体薄片,压汞曲线,相渗曲线等资料,对目的层储层进行深入分析,得出在各类岩性中,细-中晶白云岩的连通孔喉半径最大、压汞参数最好,微晶白云岩和微晶灰岩最差。根据毛细管压力曲线和孔隙结构参数特征和储层孔隙结构特征可以将储层分为4类:Ⅰ类储层、Ⅱ类储层、Ⅲ类储层和Ⅳ类储层。孔隙度大于5%的储层为I类储层,属于好储层,孔隙度在2~5%为II类储层,孔隙度在0.5~2%为III类储层,孔隙度小于0.5%为IV类储层。研究区苏东37-58井中以I、II类储层为主;苏东39-62C1和苏东40-66井主要发育III类储层。储层受沉积微相、构造作用和白云岩分布的控制,后期构造作用形成的鼻状构造有利于气藏成藏。
[Abstract]:In this paper, the reservoir of Ma-5 submember of the Suliglo Ordovician system is taken as the research object, and the basic principles and methods of sedimentology, carbonate reservoir geology, reservoir physics and reservoir sedimentology, combined with logging data, casting thin sheet, scanning electron microscope, are used in this paper. Based on the data of cathodoluminescence and mercury injection parameters, the petrological characteristics, reservoir spatial characteristics, diagenesis, reservoir porosity and permeability, reservoir classification and reservoir control factors of Ma-Wu submember are studied. The deposits of the Ma 5 submember are mainly located in the surface sea platform facies, mainly in the arid tidal flat environment. The sedimentary facies in this area can be divided into 3 subfacies, and 8 secondary sedimentary subfacies are of 13 lithologic types. The carbonate rocks in the study area mainly include granular limestone, residual grain dolomite and grain dolomite, among which the grain dolomite has the best reservoir properties. The reservoir performance of residual dolomite is better than that of limestone and breccia dolomite. The main reservoir spaces in Ma Wu 5 are intergranular pores and caverns in secondary pores, while other secondary pores appear less. The mesocrystalline, fine-grained and powdered dolomite reservoirs have the best development, physical properties, pore structure and mercury injection parameters, with intergranular pores as the main reservoir space. The main diagenesis types in the study area were studied by means of scanning electron microscope, catholuminescence and X-ray diffraction. It is considered that the main diagenesis of Ma-Wu submember in this study area are dolomitization, demoulding and dedolomitization, compaction and pressure-dissolution, silicification, dissolution, filling, etc. Recrystallization and pyrite formation. Diagenesis has different effects on the reservoir space. The study shows that the quasi-syngenic dolomitization does not form favorable pores and the intergranular pore formed by buried dolomitization constitutes an important reservoir space in the study horizon. The supergene dissolution is very important for the study of the increase of pore fractures in the horizon, but the dissolution in the burial period is limited because of the limited development of the dissolution space under the closed system. Based on the data of rock slice, rock cast thin piece, mercury injection curve and phase permeation curve, the reservoir of the target layer is analyzed in depth. It is concluded that among all kinds of lithology, the connected pore throat radius of fine to medium crystalline dolomite is the largest, and the mercury injection parameter is the best. Microcrystalline dolomite and microcrystalline limestone are the worst. According to capillary pressure curve, pore structure parameters and pore structure characteristics, the reservoir can be divided into four categories: type 鈪，

本文编号：2095053