Influence of Diagenesis and Hydrocarbon Emplacement on the Quality  of the Fuyang Reservoir in Songliao Basin

Key words: 
• diagenesis /
• hydrocarbon emplacement /
• reservoir quality /
• Fuyang reservoir /
• Songliao Basin

Abstract: Detailed study on the rock property, pore types, measured porosity and permeability, cement and diagenesis of sandstones of the Fuyang Reservoir in Songliao Basin indicates that the mechanical compression, cementation and dissolution are the main diagenesis types. Compression is one of the main factors reduced the reservoir quality, which resulted in 0.2%22% reduction of the total porosity. Cementation also plays an important role in the loss of porosity, and the major cement is calcite and quartz overgrowths. Homogenization temperature for inclusion suggests that quartz cementation and some authigenic minerals precipitation have continued after hydrocarbon emplacement during the late diagenetic phase. At the same time, the feldspar and calcite were dissolved by the organic acid liquids produced by reaction of hydrocarbon emplacement and penetrated meteoric water through the fault zones in strata, which resulted in lots of secondary porosity and contributed retention of reservoir quality of the sandstones.