Method for correcting trend of structure near large fracture based on area conservation

Abstract

The invention provides a method for correcting the trend of a structure near a large fracture based on area conservation. The method comprises the steps of 1 building stratigraphic structure models at two sides of the large fracture according to the geology, well drilling, well logging, well logging and other data, carrying out the forward modeling of an earthquake model, and determining a main region of the distortion of the structure near the large fracture; 2 analyzing a false structure imaging mechanism according to the seismic wave geometric propagation principle, and determining that the difference between stratums on the two sides of the fracture is large, and the stratigraphic velocity distortion on the two sides of the fracture surface is the main reason for causing a structure trend error; and 3 according to a seismic velocity imaging mechanism and an area conservation theorem of an actual geologic structure section, establishing a relationship between a time domain structure section and an actual structure section, and determining a structure trend correction method. According to the method for correcting the trend of the structure near the large fracture based on area conservation, the use value of the time domain seismic data is excavated, the time domain seismic data are wide in coverage range, the use time span is large, the accumulative experience of geologists is large, and the method has a good popularization value.

Description

technical field [0001] The invention relates to the technical field of oil field exploration and development, in particular to a method for correcting structural trends near major faults based on area conservation. Background technique [0002] The core of structural description by time-domain seismic data is how to accurately image the characteristics of actual subsurface structures. However, in the process of actual seismic data processing, it is difficult to take into account the local distortion of the formation velocity near the large fault due to the relatively macroscopic formation velocity in the area used. For the concealment of the exploration target and the need for deep buried hill exploration, more accurate structural geological Maps have become an essential part of exploration and production. [0003] For the correction of geological mapping velocity, the current methods are all based on the superposition correction of formation velocity outside the fault zone...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for correcting structural trend near large faults based on area conservation to eliminate the problem of structural trend errors near large faults and improve the accuracy of geological structure description

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