Study on the development of high-quality reservoirs of deep clastic rock based on diagenetic facies: taking the Kepingtage Formation in Shun 9 well area of Tarim Basin as an example
CHEN Haiying1,2, ZHANG Liqiang1
1 School of Geosciences,China University of Petroleum(East China),Shandong Qingdao 266580,China; 2 Xianhe Oil Production Plant,Shengli Oilfield Company,SINOPEC,Shandong Dongying 257000,China
Abstract：In order to understand the influence of diagenetic facies on the development of high-quality reservoirs of deep clastic rock,this paper takes the reservoir of the Silurian Kepingtage Formation in the Shun 9 well area of Shuntuogole region in Tarim Basin as an example for study. The reservoir petrology and diagenetic characteristics were analyzed by using core observation,thin section identification,scanning electron microscope,cathodoluminescence and other data. The diagenetic facies types were classified,and differential diagenesis and control factors of high-quality reservoir development were clarified. The results show that the reservoir of the Kepingtage Formation is dominated by lithic sandstone,feldspar lithic sandstone and lithic quartz sandstone,and the diagenesis is dominated by compaction,carbonate cementation and dissolution. Diagenetic facies can be divided into four types according to diagenesis and diagenetic minerals. Different diagenetic facies have undergone different evolution processes. The unstable-components dissolution facies retains a certain amount of intergranular pores after porosity reduction by compaction and cementation,and its physical properties are significantly improved after dissolution transformation. The carbonate cemented facies and rich-rigid-grains compacted facies reduce porosity and density under the influence of compression and cementation,resulting in relatively difficult dissolution and finally forming tight reservoirs. The compaction of the rich-plastic-grains compacted facies is most intense. During the whole deposition process,continuous compaction leads to final compaction. The distribution of different diagenetic facies is generally controlled by sedimentary facies. The unstable-components dissolution facies sand body developed in the tidal flat,tidal channel and delta distributary channel comprises the high-quality reservoir of the Kepingtage Formation. This distribution pattern will provide guidance for finding deep effective reservoirs.
CHEN Haiying,ZHANG Liqiang. Study on the development of high-quality reservoirs of deep clastic rock based on diagenetic facies: taking the Kepingtage Formation in Shun 9 well area of Tarim Basin as an example[J]. JOPC, 2023, 25(6): 1379-1393.
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