Abstract：Drilling results shows that Tahe Ordovician formation developed two types of concealed cave reservoirs:one is shielded by T74 strong reflections,the other is shielded by strong bead-like reflections.Some reservoirs show great potentials with high productiion.Because of their buried depth (more than 5300m),the seismic dominant frequency is rather low (about 28Hz),the seismic resolution is about 30m (1/4wavelength).The size of some caves is small,seismic responses are quite weak,and seismic characteristics of these caves are blurry.Conventional methods are not suitable to identify this kind of caves.To sovle the problem,we develop a new approach with the help of drilling and logging data.For caves shielded by T74 reflections,the principal component analysis (PCA) is used to remove adjacent strong noise and highlight reflections of caves.For caves shielded by bead-like reflections,the geo-statistics inversion based on low frequency model optimization is use to remove bead-like reflections secondary lobes.The proposed approach is succsessfullly applied to identify Ordovician subtle cave reservoirs in Tahe,8m-thick caves are clearly described.The coincidencerate is up to 83% between inversion results and drilling and logging data,which proves high reliability of the proposed approach.
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