Abstract
The Yi-176 block is located in the Yi-176 Boshen-4 fault step zone of the Bonan oilfield in the south of the Bonan sag. The Es4 member is considered as the target interval for this study. A systematic study of reservoir microscopic characteristics is carried out, through core observation, scanning electron microscope and other means in order to study the structure and type of conventional pores and nano-micrometer pores in the member and to determine the petrological and structural characteristics of the reservoir. Moreover, using mercury intrusion test parameters, the reservoir types in the study area are divided into four categories through cluster analysis, followed by prediction of the planar distribution of different types of reservoirs. The results show that the development of Type I reservoirs is relatively mature, while, is Type II and Type III reservoirs are considered as the main exploration and development direction in the future.[Received: May 8, 2020; Accepted: January 20, 2021]
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