The Mesozoic volcanic reservoir in Zaoyuan oilfield is mainly composed of andesite, with proven reserves of 1355.87×104t. With the deepening of development, it has entered the high water-cut period, and the further development has great difficulty. Taking the Andesite reservoir of Zaoyuan oilfield as an example, this paper analyzes the productivity characteristics of single well and the controlling factors of its differences by comprehensively applying static and dynamic data such as core, well logging and seismic data, and establishes the productivity evaluation standard of the target layer in the study area. The volcanic reservoir space in this area is mainly dominated by secondary dissolution pores, and fractures play a role of communication pores. The analysis shows that there is a good correlation between the productivity of volcanic rock well and lithofacies in this area, in which the outburst phase and overflow phase are the main reservoirs. In addition, productivity is positively correlated with reservoir thickness and fracture development. Column height and post-production measures also have a significant impact on the productivity of a single well. Through the research on the productivity characteristics of single well in reservoir, this paper summarizes three types of single well productivity and classification standards in this area: class I stable declining productivity type, class II rapidly declining productivity type, and class III low production
or proletarian productivity type. Class I single well was drilled with a reservoir thickness greater than 70 m, and the lithofacies was outburst phase and overflow phase. The height of single well oil column is greater than 150 m, and the variance attribute value is greater than 0.6. Class II single well is drilled with reservoir thickness of 35~70 m and the rock facies is overflow facies. The height of single well oil column is 90~150 m, and the value of variance attribute value is 0.15~0.6. Class III single well was drilled with reservoir thickness less than 35 m, and the rock facies was overflow facies. The height of single well oil column is less than 90 m, and the value of corresponding variance attribute is less than 0.15. The controlling factors of single well productivity difference in volcanic reservoir have certain guiding significance for oilfield to determine favorable reservoir area and oil well deployment and development in the next step
JI Ling, LIU Yuming, GUO Xiaolong, WANG Fei, ZHANG Rongji, SUN Jian, BAO Lei. Geological controlling factors of single well productivity in perforated and fractured reservoir in Zaoyuan oilfield. Petroleum Science Bulletin, 2021, 04: 566-575. doi: 10.3969/ j.issn.2096-1693.2021.04.039
