华蓥西石炭系黄龙组储层特征研究

发布时间：2018-02-24 13:45

本文关键词： 华蓥西地区石炭系黄龙组白云岩储层储层特征　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：本论文主要以碳酸盐岩沉积学、储层地质学、岩石学、构造地质学、测井地质学、开发地质学等理论为指导,综合应用地质、测井、岩心、分析化验及生产动态等资料,参考前人研究成果,开展华蓥西石炭系地层展布、优势沉积微相、储层特征、成岩作用对储层发育的控制等方面的研究。华蓥西石炭系地层岩性稳定,界面清楚,可比性良好。石炭系总厚度具有由北向南、自东向西逐渐减薄乃至尖灭的展布特征。华蓥西石炭系的沉积环境主要为：颗粒滩、滩间微相、砂坪、藻云坪、泥云坪。潮间带白云化的颗粒滩微相和云坪微相储层发育最好,潮上带的藻云坪和潮下带的灰云坪的储层则相对较差。研究区岩石类型以白云岩为主,其次为灰岩。矿物组合主要为白云石、方解石,含少量有机质、黄铁矿、石英、沥青、石膏及萤石。研究区储集岩类型主要以颗粒云岩、晶粒云岩为主,灰岩储层基本不发育。岩心及薄片观察结果显示,孔隙为主要的储集空间。孔隙以粒间孔、粒内溶孔和晶间孔为主,裂缝在研究区不发育,石炭系储层属于(溶)孔隙型储层。华蓥西石炭系储层整体上发育较好,但横向非均质性较强,以Ⅲ类储层为主。黄龙二段是储层发育的主要层段。孔隙度算术平均值为2.07%,渗透率平均值为0.67mD,储层在总体上为低孔、低渗储层。自石炭系沉积后,由于地壳反复升降,沉积物受到不同程度的改造、破坏,成岩作用变得异常复杂,直接影响到岩石组构和储层孔隙结构的变化。影响和控制本区储层发育的主要成岩作用有压实作用、胶结作用、溶蚀作用及白云化作用等。其中,压实作用和胶结作用对储层的发育起着破坏性作用,它们都可以使储层的孔隙度减少。溶蚀作用和白云化作用对储层的发育起着建设性作用,它们都可以改善储层。
[Abstract]:Guided by the theories of carbonate sedimentology, reservoir geology, petrology, tectonic geology, well logging geology and development geology, this paper synthetically applies the data of geology, logging, core, analysis, test and production. Referring to the previous research results, the study on the distribution of Carboniferous strata, dominant sedimentary microfacies, reservoir characteristics and diagenesis control on reservoir development was carried out in the west of Huaying. The lithology of the Carboniferous strata in West Huaying is stable, the interface is clear and the comparability is good. The total thickness of Carboniferous system has the characteristics of spreading from north to south, gradually thinning from east to west and even dipping out. The sedimentary environment of the Carboniferous in the west of Huaying is mainly as follows: granular beach. Interbeach microfacies, sand flat, algal cloud flat, mud cloud flat. The grain beach microfacies and cloud flat microfacies reservoirs with dolomitization in intertidal zone have the best development. The rock types in the study area are dolomite, followed by limestone. The mineral assemblages are mainly dolomite, calcite, small amount of organic matter, pyrite, quartz, asphalt, etc. Gypsum and fluorite. The types of reservoir rocks in the study area are mainly granular dolomite, grain dolomite and limestone reservoir. The core and thin slice observation results show that pore is the main reservoir space. The porosity is mainly intergranular pore, intragranular dissolved pore and intergranular pore. The fractures are not developed in the study area, and the Carboniferous reservoir belongs to (dissolved) pore type reservoir. The West Carboniferous reservoir of Huaying is well developed as a whole, but the lateral heterogeneity is strong. Huanglong second member is the main reservoir developed, the arithmetic average of porosity is 2.07 and the average permeability is 0.67mD. the reservoir is low porosity and low permeability on the whole. Since the Carboniferous deposits, because of the repeated rise and fall of the crust, the sediments have been transformed and destroyed to varying degrees, and the diagenesis has become extremely complicated. The main diagenesis affecting and controlling reservoir development in this area are compaction, cementation, dissolution and dolomitization. Compaction and cementation play a destructive role in reservoir development, both of which can reduce the porosity of the reservoir, and the dissolution and dolomitization play a constructive role in the development of the reservoir, both of which can improve the reservoir.
【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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