Prediction Of High Quality Tight Sandstone Reservoir Of C8 Member Of Yanchang Formation At HH105 Well Block In Honghe Oilfield

Reservoir of C8 Member of Yanchang Formation at HH105 Well Block in Honghe Oilfield is typical tight sandstone reservoir.C812 layer is the main oil producting layer,little difference of impedance between sandstone and mud,low quality seismic data and the development of fracture are the characteristics of this layer.And he wells’ distribution is uneven,most of the wells are concentrated in the area that only accounts for about 15% of the total study area.All of the problems above can lead to inaccuration of reservoir forecast,low reservoir drilling rate and high rate of low producing wells.This paper use physical properties analysis and reservoir forward simulation method,compared the difference of geophysical response characteristics between two types of reservoir based on geological understanding.This study take full advantage of the region’s geology,logging,seismic data,and tried multiple seismic attribute analysis,frequency division attribute attribute,constrained sparse spike inversion,Gaussian collocated cosimulation inversion for sandstone prediction.And tried frequency division coherence cube,frequency division ant cube and RGB showing technology for fracture prediction.Based on fully comparison and analysis of those methods,this paper chooses some of them to make comprehensive prediction of reservoir and fractures.The purpose of normal seismic-based reservoir prediction is to predict the distribution of reservoir,but under such geological conditions in this area,simply predicting the reservoir can’t support the sustainable and profitable development of the oil field.This paper proposes the concept of “High Quality Reservoir”,based on analysis of the main control factors of high quality reservoir,this paper combines the prediction result of reservoir distribution,physical properties and fractures to evaluate high quality reservoir synthetically.The distribution of high quality reservoir match the production of real drilling wells,it also proves that this research achieves the desired effect.