Geological characteristics and high production control factors of shale gas reservoirs in Silurian Longmaxi Formation, southern Sichuan Basin, SW China

MA Xinhua,XIE Jun,YONG Rui,ZHU Yiqing

Table 1 Classification and evaluation of shale gas reservoirs in the southern Sichuan.

Reservoir TOC/% Porosity/% Brittle mineral content/% Applicability Grade-I reservoir (high-quality shale reservoir) ≥3 ≥4 ≥55 Target point design Grade-II reservoir (efficient shale reservoir) 2-3 2-4 35-55 Decision making basis for reserves estimation in development plan Grade-III reservoir (prospective shale reservoir) 1-2 1-2 20-35 Prospective area selection and geologic resources/proved reserves estimation