Geostatistics simulation based full-formation velocity modeling method

Abstract

The invention discloses a geostatistics simulation based full-formation velocity modeling method. The method includes the steps of determining a preset number of velocity control layers; subjecting post-stack time migration seismic data to well-seismic calibration, subjecting top and bottom boundary layers of each velocity control layer to structural interpretation, and performing comparing and tracking to obtain top and bottom boundary layers and faults of the velocity control layers of a whole area; establishing a formation frame model of the area; establishing a velocity probability density distribution function and a velocity longitudinal variation function for each velocity control layer; establishing a velocity transverse variation function for each velocity control layer; under control of the formation frame model of the area, performing geostatistics simulation via the velocity probability density distribution functions, the velocity longitudinal variation functions and the velocity transverse variation functions of the velocity control layers so as to implement multiple velocity models; averaging the velocity models to obtain a full-formation velocity model.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas seismic exploration, and more specifically relates to a whole-layer velocity modeling method based on geostatistical simulation, which is applied to the field seismic data processing and interpretation of petroleum seismic exploration. Background technique [0002] Accurately establishing a full-formation velocity model is one of the core tasks of seismic data processing and interpretation, and is the key work content and important prerequisite for obtaining reasonable and good geological results. [0003] In the process of seismic data processing, due to the existence of assumptions of various processing methods and theories, processing personnel carry out velocity analysis in order to obtain high-quality imaging, so as to obtain the initial stacking velocity model of the study area. If the stacked velocity model is directly used as the initial velocity model for subsequent pres...

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Problems solved by technology

[0005] The essence of the formation velocity includes the control factors of the formation frame. In the process of generating the migration velocity model, the formation frame control is not added in most cases, so that the constraint control conditions of the velocity analysis are simplified, and only the factors of image quality and energy focus are used. trimming

Especially for areas with low signal-to-noise ratio, even if an early interpretation framework is added, it is very easy to cause blindness in the calculation of vertical velocity samples and confusion in the law of lateral velocity changes

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