摘要
以鄂尔多斯盆地苏77、召51区块山_2~3段储层为例,利用测井资料,岩心资料和铸体(普通)薄片、扫描电镜、X-衍射及压汞等实验,对储层基本特征、成岩作用特征、成岩相类型及平面展布特征进行研究。结果表明:储层岩石类型以石英砂岩和岩屑石英砂岩为主,成分成熟度较高,结构成熟度较低,物性低孔-特低渗。成岩作用以中等-强压实、中等-强胶结及强溶蚀为主,处于中成岩B期。依据成岩作用强度、典型自生矿物和孔隙类型,划分出4种成岩相。优势沉积微相与有利成岩相密切相关,分布于边滩或河道砂坝主砂带上的中等压实-石英弱加大-粒间孔-溶蚀相属最有利成岩相带,中等压实-中等-强伊利石、高岭石胶结-晶间孔-溶蚀孔相次之。
Taking the Shan23 reservoir in the blocks Su 77 and Zhao 51 of Ordos Basin as an example, this work studied the basic characteristics of reservoirs, diagenesis types and intensity, diagenetic facies types and their planar distribution. Such research was based on logging and core data, experiments of casting （conventional） thin sections, scanning electron microscope, X-ray diffraction, and mercury intrusion porosimetry. The results show that the reservoir rocks are dominated by quartz sandstone and lithic quartz sandstone. The compositional maturity is high and textural maturity is low. The reservoir is now characterized by low-porosity and extremely low-permeability, with moderate to intense compaction, medium-strong cementation and intense dissolution, implying the phase B of middle diagenetic evolution. Four diagenetic facies were defined according to diagenesis intensity in terms of typical authigenic minerals and pore types. The advantageous sedimentary microfacies is closely related to the favorable diagenesis facies. The moderate compaction, weak quartz secondary enlargement, dissolution pore plus intergranular pore faces, which are distributed at point bars or the main sandy belts in channel sandbars, are most favorable diagenetic facies. The moderate compaction, medium to strong illite and kaolinite cementation, as well as intergranular and dissolution pore faces take the second place.
出处
《地质与勘探》
CAS
CSCD
北大核心
2018年第1期193-202,共10页
Geology and Exploration
基金
国家自然科学重点基金项目(编号:41330315)
中国地质调查局地质调查计划项目(编号:12120114009201)联合资助
关键词
苏77、召51区块
山23段
成岩演化
成岩相
鄂尔多斯盆地
Su 77 and Zhao 51 blocks, Shan23 reservoir, diagenetic evolution, diagenetic facies,Ordos basin
