Physical threshold of high quality reservoir of Upper Paleozoic in Daniudi gas field, Ordos Basin

Abstract

Combined with the gas content and physical property data of the reservoirs, physical threshold of the Upper Paleozoic high quality reservoirs in Daniudi gas field, Ordos Basin is defined through the definition of effective reservoirs, using the method of oil test and distribution function. The results show that the threshold of porosity and permeability is 8% and 0.6×10−3μm2, respectively. The distribution function method shows that the physical threshold of the low-producing reservoir (with a daily gas production of more than 5 000 m3) is 8∼9% porosity and 0.6∼0.8×10−3μm2 permeability. Based on comprehensive analysis, porosity of 8% and permeability of 0.6×10−3μm2 are set as the physical threshold of high quality reservoir.