Abstract：The Fuyang reservoir in GTZ Block is the braided river delta sub-plain facies sediment with thin sand layer,fast-changing facies,poor regularity,and low porosity and permeability,the well logging response for the sandstone shows high resistance and low natural gammy value,the sandstone can generally be regarded as high velocity rock.Due to the geological and geophysical characteristics above,it is very difficult to conduct accurate reservoir characterization for the sandstone.Through well-seismic joint geological modeling technique and based on the geological data and seismic horizons the structure model was established for the reservoir,by using phase-controlling technique and truncation Gauss and associated sequential Gaussian simulation methods,the 3D model for reservoir lithology and the physical property,and the reservoir model were established as well.The thickness prediction and reservoir prediction of the single sand body for 3 sand layer group and 7 sub-layers in Fuyang reservoir were conducted,by comparing with drilling data the accuracy of the prediction results reach up to 80%,the reservoir type including the lithology reservoir formed by sandbody pinching-out,and the structure-lithology reservoir formed by fault blocking.
