Sedimentary Microfacies Study and Prediction of Favorable Areas of Sandstone Group I of Sartu Oil-bearing Layer at Yueliangpao Area in the South of Songliao Basin

Sedimentary microfacies on sandstone Group I of Sartu oil-bearing layer of the Upper Cretaceous Yaojia Formation at Yueliangpao area in the South of Songliao Basin are studied with logging,geological and seismic data.By using horizon seismic attribute analysis technology,the distribution characteristics of river sandstone bodies are researched.After fitting analysis,it is concluded that the sandstone Group I of Sartu reservoir is the delta front sedimentary and the sedimentary microfacies types of the major sand bodies are underwater distributary channel,mouth bar and bays between distributary channel sedimentary microfacies.The result shows that the distributary channel sand bodies were developed widely for oil and gas accumulation.Combining the structural development,the beneficial areas for structure-lithology reservoirs are predicted.