Application of structural dip angle， amplitude， and frequency attribute fusion technique in weathered crust reservoir prediction： Taking the RP Oilfield in Bongor Basin as an example
1. Oversea Business Department, Geophysical Research Institute, BGP Inc., CNPC, Zhuozhou, Hebei 072751, China; 2. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China; 3. BGP International, CNPC, Zhuozhou, Hebei 072751, China
Abstract：The granite weathered crust reservoir is characterized by high porosity， high permeability， and large thickness， but the lateral change of the reservoir is fast because of the influence of the lithology of the buried hill， the top surface shape， the exposure period， and the tectonic movement. The interface impedance between the weathered crust reservoir and the underlying formation and overlying sedimentary strata varies greatly， and the continuity is not high. The accuracy of seismic attribute analysis and seismic inversion in predicting weathered crust reservoirs is not high， so it is difficult to meet the needs of petroleum exploration and development. Therefore， the geological origin， superposition model， preservation condition， drilling data， and seismic response of granite weathered crust reservoir are integrated， and the relationship and variation characteristics among the structural dip angle， amplitude， and frequency of the buried hills are analyzed and fused to form a dimensionless composite attribute， which can reveal the thickness and variation of physical properties of the weathered crust reservoir in the bedrock. The application of composite attributes to predict the distribution of weathered crust reservoirs in RP oilfield of Bongor Basin shows that the drilling results are in good agreement with the prediction of the thickness of weathered crust reservoir， and the high-quality weathered crust reservoirs are mainly distributed in the 0~50 m depth range of the surface layer in buried hills.The development degree of weathered crust reservoirs decreases gradually with the increase in burial depth， which is confirmed by subsequent drilling.
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