Calibration method for improving seismic interpretation precision of fault terrace structures

Abstract

The invention relates to a calibration method for improving the seismic interpretation precision of fault terrace structures, and belongs to the field of oil and gas rolling development. Single wells in fault terrace structures are selected for well synthesis recording. The seismic time-depth relationship in each of the fault terraces where the selected single wells are located is determined. The corresponding relationship between the drilled formations of all the wells in each fault terrace and earthquake is established based on the time-depth relationship between the drilled formation of the selected well in the fault terrace and the seismic phase of the corresponding fault terrace. For drilling of single wells in different fault terraces, the discordogenic fault depth of a fault terrace in which a single well is drilled is used as a boundary, corresponding time-depth relationship data is extracted and spliced according to the fault terrace position where each section of a well body is located, and the seismic time-depth relationship of more than two drilled fault terrace single wells is established. The seismic interpretation precision of fault terrace structures is improved.

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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