Forecasting and evaluating technologies of three-dimensional earthquake optimum time window river course sand body storage layer

Abstract

The invention discloses a prediction and evaluation technology of 3D seismic optimum time window river channel sand body reservoirs, belongs to the technical field of the prediction and evaluation of the 3D seismic reservoirs, and aims at solving technical problem that the river channel predictive resolution of the traditional methods is not enough. The technical proposal is as follows: the 3D visualization scanning is performed on each reservoir at the interval of 1-2ms, the optimum time window is determined according to the scope shown by the target river channel, the corresponding subfield is cut out, clairvoyance and scanning are carried out on the time window properties, such as root-mean-square amplitude, wave impedance and the like, auto-tracing is performed, top surface and bottom surface are picked up, a time isopach map is calculated and converted into a sand body isopach map, a top surface structure diagram is formed by time-depth conversion, and the reservoir physical properties are evaluated by curve reconstruction, thus realizing the prediction and evaluation of the plane morphology, longitudinal thickness and the reservoir physical properties of the river channel sand body. The method adopts the optimum time window to effectively inhibit interference, is applicable to various data volumes, and can effectively predict and evaluate a thin river channel sand body with the thickness far less than 1 / 4 of a wavelength under the condition of frequent interbedding of sand and mudstone, the thin river channel sand body comprises the river channel sand body which is not corresponding to wave crest or wave trough, and the method has good application effect in petroleum exploration and development.

Description

technical field

[0001] A 3D seismic reservoir prediction and evaluation technology, especially capable of predicting and evaluating the spatial distribution, reservoir characteristics, oil and gas, production capacity, etc. Background technique

[0002] There are many existing 3D seismic reservoir prediction technologies for channel sand bodies, including recursive inversion, model inversion, multi-parameter inversion, etc., which are mainly constrained by known geological laws, drilling and logging data, and geological models. Imaging of the spatial structure and physical properties of underground strata, such as well-constrained wave impedance inversion, model-controlled wave impedance inversion, stochastic analog wave impedance inversion, curve reconstruction wave impedance inversion, colored inversion, frequency division inversion, etc. Impedance inversion, and various 3D seismic attribute inversions. One type of 3D seismic inversion is a method based on geophysical the...

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