Reservoir Quality Prediction of the Member 3 and Member 4 of the Quantou Formation in the Northern Songliao Basin

Key words: 
• diagenesis

Abstract: To predict the quality of the low permeability reservoir of the Member 3 and Member 4 of the Quantou Formation in the Northern Songliao Basin, the diageneses of the clastic rocks were divided into early diagenetic stage A, early diagenetic stage B, middle diagenetic stage A1, middle diagenetic stage A21, middle diagenetic stage A22  and middle diagenetic stage B . The results of the statistical data show that diageneses have apparent controls on the physical property and oil saturation of the reservoirs, and the sand bodies of any sedimentary facies can not produce commercial oil and gas flows in middle diagenetic stage B, and only the porosity of main river channel sand bodies is higher than the porosity cutoff of commercial oil and gas reservoir. The diagenetic stages of the Member 3 and Member 4 of the Quantou Formation in the northern Songliao Basin were predicted using diagenetic numerical modeling technology. The reservoir quality of the Member 3 and Member 4 of the Quantou Formation is the result of integrated effects of sedimentary facies and diageneses. The reservoir types and quality distribution of the Member 4 of the Quantou Formation laterally were predicted by overlap the sedimentary facies map on the diagenetic stage prediction map. The commercial oil and gas well mainly located in the reservoirs of type Ⅲ3, Ⅲ4 and Ⅲ5 in Central Depression of the northern Songliao Basin, where will be the potential exploration area of the Member 4 of the Quantou Formation in the basin.