摘要
钙屑砂岩通常较致密,储集性往往很差。在大量薄片鉴定及物性统计基础上,对须家河组T3x45砂组钙屑砂岩的岩石学、物性特征及其主要控制因素进行了详细研究,结果表明该套砂组的钙屑砂岩次生孔隙较发育,为有效的储集层,储层物性主要受控于沉积相、压实作用、溶蚀作用及构造作用等因素,其中溶蚀作用和构造破裂作用是储层发育最重要的控制因素。在储层特征及其与沉积相发育关系分析的基础上,以T3x45砂组为编图单元编制沉积微相图和砂体等厚图,预测钙屑砂岩储层平面分布特征,并对有利储层发育区块进行预测和评价,识别出3个具有较大勘探潜力的储集砂体。
Calcarennaceous sandstone is commonly tight and not served as reservoir rock. On the basis of slice identification and data statistics, the paper analyses the lithology, petrophysical properties and pore development properties for calcarenaceous sandstone of the Upper Triassic Xujiahe Formation in western Sichuan Basin. It indicates that the calcarenaceous sandstone layers characterized by welldeveloped secondary pores are effective reservoirs. The physical properties of the reservoirs are controlled by sedimentary microfacies, compaction, corrosion and tectonism. Among them, corrosion and tectonism are the most important factors. The maps of microfacies and sandbody thickness are made by using the T3x4^s sand group as the mapping unit. Based on the relationship between reservoirs and deposition facies analysis, the distribution of calcarenaceous sandstone is predicted and evaluated. T3x4^s-Ⅲ of calcarenaceous sandstone characterized by thick sandstone body, popular distribution, favorable tectonics and good oil/gas show is the most favorable block. The others are T3x4^5-Ⅱ , T3x4^5- Ⅰ and T3x4^5-Ⅳ in turn.
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2007年第5期489-496,共8页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
中国石化西南分公司重大科研项目(ZGJ-0401)
关键词
钙屑砂岩
川西坳陷
须家河组
储层特征
calcarenaceous sandstone
West Sichuan depression
Xujiahe Formation
reservoir characteristics
