摘要
在岩芯观察的基础上,利用普通薄片、铸体薄片和黏土矿物含量等实验分析结果及镜下扫描照片,对松辽盆地北部徐家围子断陷沙河子组致密砂砾岩储层的岩石特征、物性特征、矿物成分、成岩作用以及所处成岩阶段和成岩演化序列进行了研究。结果表明:沙河子组致密砂砾岩储层经历压实、胶结、溶蚀及交代等成岩作用,现今正处于中成岩B期及晚成岩阶段。根据成岩作用类型和强度,成岩矿物及其对储层物性的影响,结合测井分析,将储层划分为强压实钙质胶结相、强压实黏土胶结相、中压实弱溶蚀相及中压实强溶蚀相4种组合成岩相。选取声波时差、电阻率和自然伽马等常规测井曲线,通过岩芯刻度测井归纳了4类成岩相测井响应特征,并采用主成分分析法明确22口井纵向成岩相展布特征,总结归纳出沙河子组致密储层以强压实钙质胶结相为主,有利相为中压实强溶蚀相和中压实弱溶蚀相,且主要分布在断陷两侧。
Based on the observation of core,and the analysis results of thin section,cast thin section,clay minerals and the scanning electron microscope,the lithological characteristics,physical properties,mineral composition,diagenesis and evolution sequence of diagenesis of the sandstone tight reservoir in Shahezi Formation of Xujiawanzi fault depression in the northern part of Songliao Basin were studied.The results show that the tight sandstone reservoirs in Shahezi Formation have undergone diagenesis of compaction,cementation,dissolution and metasomatism and are now in the B stage of middle diagenetic stage to late diagenetic stages.According to the type and intensity of diagenesis,diagenetic minerals,and their influence on the physical properties of reservoirs,combining with the well log analysis,four types of combined diagenetic facies are identified in the reservoir: strongly compacted calcium cemented facies,strongly compacted clay cemented facies,medium compaction with weak dissolution facies,and medium compaction with strong dissolution facies.Based on sonic,resistivity,gamma ray etc.,the response characteristics of four types of diagenetic facies are summarized through core scale logging,and the vertical distribution of 22 diagenetic facies are established using principal component analysis.It is concluded that the tight reservoir in Shahezi Formation is dominated by strongly compacted calcium cementation,and the favorable facies is medium compaction with strong dissolution facies and medium compaction with weak dissolution facies,which are mainly distributed on both sides of the fault depression.
作者
朱映康
ZHU Ying-kang(Exploration and Development Research Institute of Daqing Oilfield Company Ltd.,Daqing 163712,Heilongjiang,China)
出处
《世界地质》
CAS
2019年第4期1044-1053,共10页
World Geology
基金
国家科技重大专项(2016ZX05047-001)
中国石油科技重大专项(2016E-0203)联合资助
关键词
徐家围子断陷
沙河子组
致密砂砾岩储层
测井识别
成岩作用
成岩相
Xujiaweizi fault depression
Shahezi Formation
tight sandstone reservoir
logging recognition
diagenesis
diagenetic facies
