Seismic Prediction Of Jurassic Qigu Formation Reservoir In Fengcheng Oilfield

Fengcheng Oilfield is one of the biggest heavy oil fields in China,which is in the northwest of Junggar Basin.The type of reservoir in Fengcheng Oilfield is fault block reservoir.These fault block reservoirs are mainly controlled by structure and influenced by stratigraphy unconformity at the same time.Fengcheng Oilfield has sandstone and sandy conglomerate reservoirs deposited in braided rivers and braided river deltas.These sandstone and sandy conglomerate reservoirs have extensive distribution and great connectivity.Fengcheng Oilfield has high tectonic complexity,oil viscosity and oilfield development difficulty,so an effective development plan of fault block heavy oilfield is needed to make reservoir development more meticulous and keep the output of Fengcheng Oilfield.Taking the seismic prediction of Jurassic Qigu Formation reservoir in Fengcheng Oilfield as an example,this paper analyses some geological characteristics of Fengcheng Oilfield reservoir,including sedimentary,structural and reservoir characteristics.On the basic of high resolution seismic data,the distribution of strata and faults can be interpreted effectively with logging and geological data,and the distribution system of micro-fracture can also be carried out on the basis of structural interpretation.In this paper,geostatistical inversion is used mainly to show the prediction result of formation thickness and sand-land ratio of Jurassic Qigu Formation in Fengcheng Oilfield.Based on seismic data,coherence,curvature and seismic inversion techniques are used in this study to comprehensively analyzed.Through analysis,a kind of seismic prediction method for heavy oil reservoirs in sandstone and sandy conglomerate is obtained,which provides an effective reference for future exploration and development of heavy oil fields.