Abstract：Combined with drilling data of high-temperature and overpressure in Yinggehai Basin,reflection characteristics of flat spots on poststack seismic data are analyzed systematically in order to identify hydrocarbon reservoirs under complex conditions.On this basis,prestack AVO features of flat spots are also analyzed.It is found that flat points have positive reflection coefficients at the normal incidence,and the reflection coefficient increases gradually with the increase of incident angle.AVO features of flat points are different from conventional four classes of Castagna AVO scheme.These phenomena are confirmed by theoretical deduction and seismic forward modeling.A new strategy of flat spot identification is proposed.For poststack data,the flat point identification is based flat point shapes and reflection energy;for prestack data,the flat point analysis should focus on AVO characteristics and AVO types of sand top & bottom.The proposed strategy is used in the study area and the flat spot identification is greatly improved.
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