4 results about "Zoeppritz equations" patented technology

The invention discloses a Young impedance and longitudinal and transverse wave velocity ratio nonlinear direct seismic inversion method based on an accurate YIRD-Zoeppritz equation. The Young impedance and longitudinal and transverse wave velocity ratio nonlinear direct seismic inversion method comprises the steps that the YIRD-Zoeppritz equation is obtained, and the Young impedance YI, the longitudinal and transverse wave velocity ratio PSR and the rock density are inversed through an ADA-MCMC-LpSC nonlinear inversion algorithm providing sparse prior information based on the Lp norm. Based on an accurate YIRD-Zoeppritz equation, the accurate prediction method for the Young impedance and the longitudinal and transverse wave velocity ratio under the ADA-MCMC-LpSC nonlinear optimization inversion algorithm is achieved, and the key geophysical problem that the accurate Zoeppritz equation cannot be directly used for predicting the Young impedance and the longitudinal and transverse wave velocity ratio parameters at the same time at present is solved.

The invention discloses a microfracture porosity seismic rock physics linear inversion method, and belongs to the field of oil and gas reservoir exploration. The method comprises the following steps: firstly, constructing an earthquake rock physical forward model by combining a dual-dual pore medium DDP-BR equation as a core and a Zoeppritz equation, establishing a quantitative mapping relation between physical parameters and earthquake data, calculating a Frechet derivative of a forward operator to the physical parameters, and realizing earthquake rock physical linear inversion based on DDP-BR by adopting an LBFGS-MT algorithm. The method comprises the following steps of: firstly, inverting hard hole local porosity, micro-crack local porosity, inclusion content and water saturation by adopting seismic data; and secondly, indirectly estimating the porosity of the hard hole, the porosity of the micro-crack and the total porosity, and avoiding the problem of inversion instability caused by strong coupling among parameters. A synthetic data test verifies that the method has good stability and inversion precision, and microfracture development information of a complex reservoir can be effectively estimated.

This specification relates to the field of seismic data processing and interpretation technology, and provides a method, apparatus, device, storage medium, and product for predicting gas saturation. The method includes: acquiring pre-stack angle gather data of a target reservoir; performing pre-stack inversion on the pre-stack angle gather data using the Zoeppritz equation to obtain the elastic parameters of the target reservoir; and inputting the elastic parameters of the target reservoir into a pre-trained gas saturation prediction model to obtain the gas saturation of the target reservoir. The gas saturation prediction model is trained based on a KAN model, which uses a learnable activation function to capture the nonlinear relationship between the elastic parameters and the gas saturation. This specification's embodiments can improve the accuracy of gas saturation prediction.

The invention relates to the technical field of geophysics, seismic exploration, oil-gas exploration and tunnel and underground engineering, and discloses a pre-stack generalized progressive-order Taylor expansion inversion method, which comprises the following steps of: establishing an initial model of longitudinal wave velocity, transverse wave velocity and density by using logging information, and constructing a prior model through a damping least square method; constructing a first-order Taylor expansion form and a second-order Taylor expansion form of the synthetic seismic record based on an accurate Zoeppritz equation, and introducing the first-order Taylor expansion form and the second-order Taylor expansion form as double targets into a multi-target arithmetic optimization algorithm for joint solving; the balance of global search and local approximation is realized through an arithmetic operator, and a non-dominated solution set is maintained by means of an elite archive, so that an inversion result of a continuous progressive order from first-order approximation to second-order approximation is obtained; and finally, determining an elastic parameter inversion result according to a minimum oscillation and transverse consistency criterion. According to the method, the stability and prediction reliability of pre-stack AVA inversion can be improved.