Abstract:The Ordovician reservoirs at deeper than 6000 m in the Gucheng low uplift in the eastern Tarim Basin are dolomite and limestone, which are taken as the typical deep to ultra-deep exploration targets. The quality of ultra-deep seismic data is affected by seismic acquisition, attenuation and processing, so that it is difficult to get expected results of reservoir prediction. In this study, based on the data with wide azimuth, the interpretation workflow for "2W1H" data was proposed, and then based on the information of broadband and azimuth, lithology prediction, zonal optimization and gas identification by dominant zones of deep karst reservoirs were carried out in the Gucheng low uplift. In order to improve the accuracy of reservoir prediction and determine the favorable exploration area in the study area, the distribution of dolomite was predicted by using the broadband of the seismic data, and the gas potential of the reservoir was detected by using the dominant azimuth of the seismic data. The results show that reservoir prediction based on the relationship between amplitude and frequency (AVF) is better than that of pre-stack seismic inversion. The wide azimuth seismic data has certain dominant azimuth of hydrocarbon response, and the anisotropy at such azimuth is less, and the hydrocarbon response characteristics are more obvious. This can better predict the distribution of favorable deep gas reservoirs.
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