Dainan Formation in Majiazui Oilfield is characterized by developed fractures and is primarily composed of structural-lithologic reservoirs. The reservoirs exhibit thin vertical thickness and rapid lateral distribution changes

demanding high precision in reservoir prediction

which conventional seismic inversion methods struggle to meet. To address this challenge

the waveform indication simulation method was employed for thin reservoir prediction in the study area. This method

guided by waveform coherency

uses changes in seismic waveforms laterally instead of variogram functions to simulate target parameters

yielding high-precision inversion results that better conform to sedimentary and geological laws. Taking advantage of the dense and numerous development wells in the study area

and integrating geological

seismic

and well logging data

the spontaneous potential curve

which is sensitive to the reservoir

was selected for waveform indication simulation. This approach was used to predict the distribution of the main oil-bearing sand groups. The inversion results were analyzed in conjunction with the computation wells

check wells

and cross-fault wells

indicating that the waveform indication simulation has high vertical and lateral resolution. It can finely reflect the spatial variation of the reservoir. The main oil-bearing sand group's planar distribution was extracted and found to be consistent with the sedimentary patterns of the study area. Combined with the oil layer distribution map

the target oil-bearing sand group's distribution was re-evaluated

suggesting potential for rolling extension to the west beneath the Ma3 fault. This insight could guide further exploration and development strategies in the Majiazui Oilfield.