TheM icrofac ies Combination and Character istic of Main Sandbodies in Xifeng Oil Field, Shan-Gan-Ning Basin

Key words: 
• microfacies combination ofmain sandbody /
• submerged distributary channel /
• braided delta front /
• Xifeng oil field /
• Shan-Gan-Ning basin

Abstract: The braided delta front are developed in Yanchang Formation in Xifeng area of Shan-Gan-Ning basin,which is mainly composed of the submerged distributry channels and mouth bars. It can be divided into submerged distributary channels section, submerged distributary channels together with mouth bars and mouth bars section.Based on the research of submerged distributary channels and mouth bars, the abundant sandbodies assemblage can reflect different sedimentary environments. For instance, submerged distributary channels section is composed of trunk sandbodies,campaniform sandbodies and campaniform-trunk sandbodies etc. The relationship between the characteristics and quality of the reservoirs and their physical p roperty and oil - bearing property is analyzed and the law of oil and gas distribution in the area is described, which provides reliable basis for the further exp loration and development of the area.