Thin inter-bed prediction with poststack frequency improvement and multi-attribute analysis:an example of Carboniferous sand-mudstone member in Lunnan Area
LIU Yan1, ZHAO Haitao1, XU Hongxia2, YANG Xianfeng2, LI Bin1, LUO Haining1
1. Research Institute of Petroleum Exploration and Development, Tarim Oilfield Company, PetroChina, Korla, Xinjiang 841000, China; 2. BGP Inc., CNPC, Zhuozhou, Hebei 072751, China
Abstract：Thin inter-bedded reservoirs are well deve-loped in the Carboniferous sand-mudstone member in Lunnan Area,which shows great hydrocarbon potential.However it is very difficult to predict the distribution of this kind of reservoirs with conventional methods due to deep burial (great than 5300m),physical-property rapid changes,and small bed thickness (1~3m).Forward modeling,post stack resolution processing,and multi-attribute analysis provided by GeoEast System are used for in-depth geological analysis.The plane distribution of reservoirs is well characterized.The following understandings are obtained:①Amplitude characteristics are mainly responses of reservoir thickness and physical properties,while sand combination and the fluid property have less influence on the amplitude characteristics.Therefore,the reservoir prediction can be achieved with amplitude and waveform characteristics; ②Six seismic facies in the study area are classified.Spectrum and waveform classification attributes can relatively distinguish thin sandstone and mudstone areas; ③Highlight volume attribute can accurately predict thin inter-bedded reservoirs.The sand inter-bed thickness with high value is usually more than 10m with good physical properties (porosity bigger than 12%); while low value is small thickness (generally less than 6m) with poor physical properties.
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LIU Yan, ZHAO Haitao, XU Hongxia, YANG Xianfeng, LI Bin, LUO Haining. Thin inter-bed prediction with poststack frequency improvement and multi-attribute analysis:an example of Carboniferous sand-mudstone member in Lunnan Area. Oil Geophysical Prospecting, 2018, 53(s1): 196-200.
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