APPLICATION OF SEISMIC FREQUENCY SPECTRAL RATIO TO THE PREDICTION OF CHANNEL SANDBODIES

With the development of seismic prospecting and processing technologies,using the seismic information correlated to lithology and oil potential to predict reservoir sandbodies and distinguish oil postential has become one of the important means to increase success ratio of petroleum exploration.But in many cases,geologists can't distinguish the changes of seismic records being resulted from stratigraphy,lithology,or from outside conditions.The seismic frequency spectral ratio technology makes full use of the features that seismic data include rich information.It carefully depicts the transverse variation of seismic frequency spectrum,and can better eliminate the noise influences in seismic records resulted from exciting and receiving conditions so as to project the transverse changing characteristics of lithology and hydrocarbon.It can be applied to distinguish lithology and predict reservoirs.In this paper,the Dawangzhuang oil pool in the Raoyang Say of Central Hebei Province was taken as an example to introduce the prediction of channel sandbodies and lithologic reservoirs by means of the seismic frequency spectral ratio method.Two drilling well sites were determined according to predicted results,and industrial oil flow was obtained by drilling practice.