Abstract: The Ordovician carbonate rock of Yingshan Formation in Tahe area is an important exploration and development target in Tarim basin, and the analysis on the reservoir characteristics is  important for deep oil and gas exploration. Based on the core, thin section, logging and seismic data, in this paper the authors discuss the rock types, reservoir space types, physical properties, and reservoir types of Yingshan Formation, comprehensively analyze the main controlling factors affecting the development of Yingshan Formation carbonate reservoir, and summarize the development rules and models. The research shows that the carbonate rocks of Yingshan Formation are mainly bright crystal grain limestone, wackestone and micrite, and the reservoir space is composed mainly of inter-granular pores, inter-crystalline pores, fractures, dissolution pores， and karst caves. The reservoir types can be divided into four types, including fracture, cavity, fracture-porosity, and fracture-karst cavity. The reservoir of Yingshan Formation is the combined result of paleo-topography, sedimentary environment, diagenesis, etc. The paleo-topography is the background of reservoir development, and the paleo-topography of sedimentary period and supergene period has different functions. Sedimentary environment is the basis of reservoir development, and the rock porosity and permeability in different sedimentary facies are obviously different. Diagenesis controls the formation of reservoirs, among which the most critical ones are dissolution and fracturing: Multi-stage and multi-type dissolution is the key to the formation of reservoirs, and fracturing promotes the formation of reservoirs.

Key words: Yingshan Formation, carbonate rock, reservoir characteristics, main control factors, development model, Tahe area