Multi-well Constrained Seismic Inversion In Reservoir Description

The seismic data can be applied to reservoir description morethan to geological construct interpretation in the stage of exploration and development. However, the conventional seismic data can notdirectly be applied to reservoir description and be required seismic inversion as it can only represent the reflection of wave impedance interface.This paper studies mainly the method and application of the multi-well constrained seismic inversion for ShengLi Oil Field's complex non-marine reservoir rock based on the study of several mature methods of well logging constrained seismic inversion at present. Author thinks that the seismic inversion for complex non-marine reservoir rock may require some wells restriction and the control of structure model in the lateral extrapolation, that its key is the calibration, the control of structure model and the restriction of wells. Our method is based on non-linear convolution model and usesartificial nervous net algorithm and simulated annealing algorithm,introducing the acoustic impedance as condition of constrained solution to avoid the hypothesis of wavelet or reflection coefficient incommon seismic inversion, and adopting the control of fine seismicinterpretation model in extrapolation.Meanwhile, this paper discusses the data preprocessing, buildingstratigraphic frame model and the multiple calibration, which areused in multi-well constrained seismic inversion. The inversion's resolution is restricted by seismic sampling rate, dominant frequencyand bandwidth used a practical model to prove, and two difference concepts are put forward between seismic resolution and stratigraphic resolution. Because of the multiple resolution of seismic inversion data and the underground geological characteristic complex, author points out that the inversion's ability which is applied to solving the geology problem should be reasonable analysed and judged objectively. And the strategy for improving the inversion result should be presented, so that someone relative can maybe use of it. At last, several examples of mature application in ShengLi Oil Field about multi-well constrained seismic inversion are listed below.