Method for calculating layer speed and establishing average speed field via measurement plate method

Abstract

The invention brings forward a method for calculating layer speed and establishing an average speed field via a measurement plate method. The method comprises the following steps: time-depth material of wells and time curved surfaces of all control layers are obtained, layer speed of all control layers at well points is obtained, layer speed measuring plates are drawn, a via measurement plate function relation between time and layer speed at each layer is obtained, layer speed of each layer is calculated, a speed grid of each layer is generated, an average speed body scattered point set is calculated, and a three dimensional average speed field is generated via three dimensional gridding operation. According to the average speed field generated via the method disclosed in the invention, high precision can be achieved at positions with well control; at positions without well control, reasonable speed value can be placed; good effects can be exerted, data can be easily obtained, a small amount of time is needed for establishing the average speed field, and high efficiency can be realized; the method can also help solve a problem that the average speed field which is generated via a traditional method is large in probability of in deformation and distortion in conversion from time domain data to depth domain data.

Description

technical field [0001] The invention relates to the technical field of average velocity field, in particular to a method for obtaining layer velocity and establishing an average velocity field by a plate-sizing method. Background technique [0002] In petroleum geophysical seismic exploration, the data collected in the work area is in the time domain. To convert time domain data into depth domain, an accurate and reliable average velocity field is needed. [0003] The current mainstream seismic exploration software mainly uses the time-depth data of existing wells in the work area, converts them into time-velocity curves, and then mathematically interpolates them into the average velocity field of the whole area. [0004] There are often many unreasonable situations when using this method, such as irregular velocity values ​​in places far away from the well, and large deformation of the depth-to-depth data, which is far from expectations. [0005] Such as the invention pat...

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Problems solved by technology

[0004] There are often many unreasonable situations when using this method, for example, in places far away from the well, the velocity value is irregular, and the deformation of the depth data is large, which is far from the expected

[0005] Such as the invention patent of Chinese patent CN 105353412A, the invention provides a calculation method and calculation system of the combined average velocity field of the well and seismic, however, the calculation method and the calculation system of the combined average velocity field of the well and seismic of the invention, such as in a place far away from the well In some places, the speed value is irregular, and the deformation of the depth-to-depth data is large, which is far from the expectation

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