Abstract:

The Silurian reservoir is advantageous for hydrocarbon accumulation and shows its richness in crude oil and gases in Tahe oilfield. The Silurian reservoir properties in general have medium-low porosity and permeability, and the overlaying shale form 3 sets of reservoir-cap assembles. The oil-gas reservoir types include anticline, stratigraphic, lithological and compound oil and gas reservoirs. The research indicates that the Silurian hydrocarbon accumulation characteristics are multistage charging and multistage hydrocarbon accumulation. The main periods of hydrocarbon accumulation are Late Caledonian, Hercynian and Late Himalayan. The formation and distribution of oil and gas pools are controlled by many factors, which include structure, development degree of fault, and high-quality reservoirs. The south part of Tahe oilfield is favorable area for tectono-stratigraphic reservoir exploration. The Tuoputai area of Tahe oilfield is favorable region for primary pool.

Key words: reservoir characteristic, reservoir type, controlling factor, Silurian, Tahe oilfield