建昌盆地微观储层特征研究

发布时间：2019-03-22 16:15

【摘要】：建昌盆地经历了多期构造运动,溶洞、溶孔、断裂、微裂缝等十分发育,加上该区发育的火山岩和砂砾岩,使该区储集条件更为复杂。前人已经建立了较为完整的中生界-元古界的地层序列。然而,目前对于建昌盆地的认识仍然停留在宏观层面上,随着石油地质工业的发展,储层沉积学的研究日益从宏观向微观方向发展,因此对于该区微观储层及微裂缝的研究就显得尤其重要。通过对工区内三口探井的岩心、岩屑样品进行显微薄片鉴定、荧光薄片鉴定、铸体薄片鉴定、压汞分析、全岩X衍射、扫描电镜等室内试验分析,结合野外剖面、测井曲线等数据,对建昌盆地储层岩石类型、储集空间类型、储层物性特征三方面进行了深入的研究。建昌盆地储层岩石类型包括两大岩类,即沉积岩和岩浆岩,又可细分为二十余种岩石类型。其中,碳酸盐岩是最主要的储集岩,其次是石英砂岩。储层主要经历了三大类成岩作用：物理作用、化学作用和生物作用。储集空间类型包括两大类五种类型,即孔隙型：包括粒间孔、晶间孔、溶孔及溶洞；裂缝型：包括压溶缝、构造缝。孔隙组合类型有三种,分别是粒(砾)间孔+裂缝+压溶缝组合、裂缝型组合、压溶缝+微裂缝+晶间孔组合。岩心分析结果表明,样品孔隙度最大值为9.7%,最小值为0.7%,平均值为2.9%。渗透率最大值为18.4×10-3μm2,最小值为0.002×10-μm2,平均为1.84×10-μm2。认为盆地储层大部分为特低孔特低渗型。
[Abstract]:Jianchang Basin has experienced multi-stage tectonic movement, karst holes, dissolved holes, faults, micro-fractures and so on. In addition, the volcanic rocks and sand conglomerate developed in this area have made the reservoir conditions more complicated in this area. Previous scholars have established a relatively complete stratigraphic sequence of Mesozoic-Proterozoic. However, the current understanding of Jianchang Basin is still at the macro level. With the development of petroleum geology and industry, the study of reservoir sedimentology is developing from macro to micro. Therefore, it is very important to study micro-reservoir and micro-fracture in this area. The core and cuttings samples of three exploration wells in the working area were identified by microscopic slice identification, fluorescence thin slice identification, casting thin slice identification, mercury pressure analysis, whole rock X-ray diffraction, scanning electron microscope and other laboratory test analysis, combined with field section. The reservoir rock types, reservoir space types and reservoir physical properties of Jianchang Basin are studied by logging curves and other data. The reservoir rock types in Jianchang Basin include two major rock types, namely sedimentary rocks and magmatic rocks, and can be subdivided into more than twenty rock types. Carbonate rock is the most important reservoir rock, followed by quartz sandstone. The reservoir mainly experienced three types of diagenesis: physical, chemical and biological processes. The reservoir space type includes two types and five types, namely pore type: intergranular pore, solution pore and karst hole; fracture type: including pressure dissolution fracture, structural fracture. There are three types of pore assemblages: intergranular (gravel) pore fracture pressure-dissolution combination, fracture-type combination, pressure-solution joint micro-crack intergranular pore combination. The core analysis results show that the maximum porosity of the sample is 9.7%, the minimum value is 0.7%, and the average value is 2.9%. The maximum permeability is 18.4 脳 10 ~ (- 3) 渭 m ~ 2, the minimum value is 0.002 脳 10 ~ (- 渭 m ~ 2), and the average permeability is 1.84 脳 10 ~ (- 2) 渭 m ~ (2). It is considered that most of the reservoirs in the basin are of ultra-low porosity and low permeability.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

【相似文献】