Absorption attenuation gradient detection based on generalized S transform
Zhang Gu-lan1, He Zhen-hua2, Li Jia-jin3, Li Yan4, Wu Chang-jiang1, Li Ke-en1
1. Deuelopment and Production Seismic Division BGP Inc., CNPC, Zhuozhou, Hebei, 072751, China;
2. State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sicuan 610059, China;
3. Tarim Oil Field, CNPC, Korla, Xinjiang 841000, China;
4. Directional Drilling Technology Services Company of Western Drilling Engineering Limited, CNPC, Urumqi, Xinjiang 830026, China
Abstract：Time-frequency analysis can be used to time-frequency decomposition of seismic waves,and thus to obtain absorption attenuation gradient of high-frequency for hydrocarbon detection.However,when there is strong high-frequency interference in seismic records,the absorption attenuation gradient of high frequency is not a very good response to the real absorption attenuation of layer.In this paper,we take the advantage of higher time-frequency resolution of the generalized S transform and use the time-frequency spectrum to obtain seismic absorption attenuation gradient of low-frequency,then compared with the absorption attenuation gradient of high-frequency to better direct hydrocar bon.Results of theoretical derivation,numerical simulation and field data application show that generalized S transform based on absorption attenuation gradient detection of low-frequency and high-frequency can mutually support,and better point the existence of hydrocarbon.
