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《Journal of Northeast Petroleum University》 2017-06
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Application of amplitude attenuation gradient attribute to hydrocarbon detection

Qin Tong;Gao Wei;Liu Gongli;Zhang Shengqiang;Tianjin Branch of CNOOC(China) Company Limited;  
Traditional post-stack hydrocarbon detection based on high-frequency energy attenuation gradient failed to make full use of either high-frequency attenuation or low-frequency resonance. Meanwhile its result is interface information with weaker interpretation and lower seismic resolution. In order to highlight hydrocarbon response better in post-stack seismic data,a new hydrocarbon detection method of amplitude attenuation gradient frequency-division attribute under the constraint of lithology was established. Based on the attenuation characteristics of seismic waves after passing through the reservoir,amplitude attenuation gradient technique and frequency division technique were aimed at enhancing the feature of high-frequency attenuation and low-frequency resonance of oil and gas in reservoir respectively. And 90° phase rotation technique in assist could transform the interface information into strata information for better interpretation. Lithological constraints were introduced at last to improve resolution and accuracy. Theoretical model results showed that oil and gas properties of the reservoir could be highlighted effectively without loss of seismic resolution. Practice results showed that this method was in good agreement with drilling,and oil-water interface predicted by seismic attribute was identical to the drilling pressure extrapolation. So this method has obvious effect in hydrocarbon detection.
【Fund】: 国家科技重大专项(2016ZX05024-003)
【CateGory Index】: P631.4
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