Evaluation of carbonate reservoirs by frequency-spectrum integration attributes
Dai Shuang-he1,4, Yu Jing-bo2, Yuan Yun-chao2, Mao Feng-jun3, Chen Zhi-gang2
1. School of Earth and Space Sciences,Peking University, Beijing, 100871, China;
2. BGP Geological Research Center,CNPC, Zhuozhou, Hebei, 072751, China;
3. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, 100083, China
Abstract：Within thin carbonate reservoir,there is dual medium feature of both fracture-caves and matrix reservoir space in the North Teruwa Field of the eastern fringe of Caspian middle block.There are tiny difference of seismic attributes(amplitude and impedance,etc) between reservoir and non-reservoir,and the difference is evident between actual drilled results and the high-production zones predicted by multiple attributes analysis.In this paper,carbonate reservoirs are evaluated with frequency-spectrum integration.When seismic waves pass fluid-bearing reservoirs,there will be a dynamic feature of 'cooscillation in low frequency and attenuation in high frequency'.In this paper,we show our prediction of high porosity and high permeability zones by storage space attribute and our prediction of high-production zones by the crossplot of mobile hydrocarbon porosity versus deliverability.Good results are acquired when the study conclusions were applied into directing the field exploration.
