Method and Application of Phase-Controlled Frequency Division Inversion for Unconventional Reservoirs

Conventional seismic inversion methods based on sparse pulses are limited by the seismic data frequencey band and cannot effectively identify thin reservoirs. At the same time, the conventional inversion method is inverse distance weighted interpolation when constructing the initial model. The inverse distance weighting method does not consider the problem of occlusion between wells, which causes the problem of bull-eye effect in the inversion results, which is not benefit for inversion horizontal fidelity. Aiming at the problems of low resolution and poor lateral fidelity of conventional inversion methods, this paper proposes a phase-controlled frequency division inversion method for unconventional reservoirs. An azimuth distance weighted method is proposed to establish the initial model. The shielding effect between wells improves the horizontal fidelity of the reservoir during inversion and reflects the concept of facies control. At the same time, the time-frequency analysis method is used to divide the logs and seismic data, establish inversion models of different scales, make full use of seismic high, medium and low frequency information, and synthesize seismic inversion information of different scales to identify thin layers, reflecting high resolution inversion conception.