Application of seismic wavelet decomposition and reconstruction technology in thin reservoir prediction
The T813K-TK715 well area is a key oil-bearing well area in Tahe Oilfield,and oil and gas display actively in many wells in the Carboniferous,but the sand body distribution is unknown.As shown by seismic data,the reservoir response characteristics are unclear,and the strong reflection of Carboniferous Karashayi Formation unconformity shields the reflection information of the underlying reservoir,which makes it difficult to describe the stratigraphic trap near the erosion line.Combined with the geological characteristics of the working area,two-dimensional seismic and wedge-shaped strata models are established,forward simulation technology is applied to gain forward simulation results,and the obtained forward simulation results are handled by wavelet decomposition and reconstruction technology.The results show that the wavelet decomposition and reconstruction technology effectively suppresses the strong reflection of Carboniferous Karashayi Formation unconformity,weakens its shielding effect on the reflection of the underlying sand body,enhances the continuity of the reflection at the bottom of the strata,and improves the accuracy of the seismic profile identification of the pinch-out point,which provides a new idea and technical support for identifying the thin sand body and the stratum pinch-out point in the background of strong reflection shielding of the T813K-TK715 well area in Tahe Oilfield.
wavelet decomposition and reconstructionforward simulationpinch-out point identificationKalashayi Formation
NETL
NSTL
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