1 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China; 2 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 3 Changqing Oilfield Company,Petrochina, Xi'an 710018,China
Abstract：Based on the description of the core,casting thin sections,scanning electron microscopy and other data,the rock types,diagenesis types,distribution characteristics and main controlling factors of diagenetic facies were systematically studied for the Member 9 oil-bearing interval of Triassic Yanchang Formation in the Zhengning area of the Ordos Basin. The rock types of the Member 9 oil-bearing interval are mainly composed of fine-to medium-grained lithic arkose and feldspathic lithic sandstone. The diagenesis types mainly include compaction,chlorite cementation,calcite cementation,ankerite cementation,siliceous cementation,calcite replacement and dissolution. The Member 9 oil-bearing interval in the study area is currently in the middle diagenesis stage A. According to the stratification frequency and plastic mineral content,the rock type can be divided into high-frequency stratification flake-like plastic-mineral rich silt-to fine-grained sandstone rock facies and low-frequency stratification rigid-mineral rich fine-medium-grained sandstone rock facies. The former distributed at the edge of underwater distributary channel with the densely compacted diagenetic facies are developed,while the latter formed in the main channel of underwater distributary channel and mouth bar. The thick single sand-body and the thick multi-storey sand-body can be divided according to the sand-body structure. The thick single sand body is a single channel or mouth bar sand-body,which is characterized by calcite-filling cementation phase in the upper part and chlorite-lining cementation phase in the lower part. The thick multi-storey sand-body is formed by multi-stage channel sand-body scour and superposition,which develops calcite-chlorite-filling cementation phase. The ductile grain content is the most important factor influencing compaction strength,resulting in a poor reservoir quality superposed carbonate cementation and the inhibition of the compaction by the early chlorite-lining cementation is an critical condition for the favorable reservoir development. The comprehensive evaluation shows that the favorable reservoir of Member 9 oil-bearing interval of Yanchang Formation developed with the chlorite-lining cementation facies. The next is the chlorite-calcite-cementation filling phase. The reservoirs with the lowest quality are developed at the calcite-filling cementation phase and compacted dense phase.
Shen Mo,Zhu Xiao-Min,Li Cheng-Shan et al. Diagenesis of the Chang 9 oil-bearing interval of Triassic Yanchang Formation in Zhengning area,Ordos Basin[J]. JOPC, 2020, 22(3): 539-554.
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