A Calibration Method for Improving the Accuracy of Seismic Interpretation of Faulted Structures

Abstract

The invention relates to a calibration method for improving the accuracy of seismic interpretation of fault-step structures, which belongs to the field of rolling development of oil and gas. In fault-step structures, selected single wells in each fault-step structure are selected for well synthesis records, and the location of the selected single well is determined. The time-depth relationship between the seismic time and depth in each fault step, using the time-depth relationship between the selected single well drilling in each fault step and the corresponding fault step seismic phase, establishes the relationship between the drilled formations and earthquakes of all wells in each fault step Correspondence relationship: For single wells that encounter different fault steps, the depth of the fault step boundary fault encountered by the single well is used as the boundary, and the time-depth relationship data of the corresponding sections are extracted according to the fault step positions of each section of the well body to splicing, and the drilling encounter is established. The seismic time-depth relationship of two or more fault-step single wells improves the accuracy of seismic interpretation of fault-step structures.

Description

technical field [0001] The invention relates to a calibration method for improving the accuracy of seismic interpretation of fault-step structures, which belongs to the field of oil and gas rolling development, and is applicable to the technical field of fine seismic interpretation of contiguous fault-step structures in old areas. Background technique [0002] The exploration and development of oilfields in central and eastern China has entered the middle and late stages, and the fine development of oilfields is imminent. Improving the calibration accuracy between the strata encountered by each well and the seismic phase in the target area is the key to improving the accuracy of seismic structure interpretation. At present, the commonly used calibration of well drilling and seismic phase depends on the seismic time-depth relationship. There are two methods to establish the seismic time-depth relationship. The first method is the time-depth relationship of points instead of pl...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a calibration method for improving the accuracy of seismic interpretation of fault-step structures, which overcomes the problem in the prior art that wells in different fault-steps use the same time-depth conversion relationship, resulting in wells in different fault steps The calibration error between the drilled formation and the corresponding seismic phase is large, resulting in low accuracy of seismic tectonic interpretation

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