Constructing method and constructing device for time-lapse seismic data acquired by marine towline

Abstract

An embodiment of the invention provides a constructing method and a constructing device for time-lapse seismic data acquired by marine towline. The method comprises the steps of acquiring first-period time-lapse seismic data and second-period time-lapse seismic data beforehand; traversing each source point in the first-period time-lapse seismic data, and traversing each source receiver pair in the time-lapse seismic data of the first source point; acquiring the time-lapse seismic data of the first source point from the first-period time-lapse seismic data; defining the second-period time-lapse seismic data in a preset circular range; acquiring information of a first source receiver pair in the time-lapse seismic data of the first source point; determining whether the information of the source receiver pair in the second-period time-lapse seismic data in the preset circular range matches the information of the first source receiver pair; and when the information of the source receiver pair in the second-period time-lapse seismic data in the preset circular range does not match the information of the first source receiver pair, selecting information of the source receiver pair which satisfies the preset condition from the second-period time-lapse seismic data in the preset circular range as the time-lapse seismic data after construction. The constructing method and the constructing device provided by the technical solution according to the embodiment of the invention can effectively improve repeatability of the first-period time-lapse seismic data and the second-period time-lapse seismic data.

Description

technical field [0001] The invention relates to the technical field of time-lapse seismic, in particular to a method and device for constructing time-lapse seismic data of a sea streamer. Background technique [0002] Time-lapse seismic technology is a technique for studying the dynamic characteristics of reservoirs based on the difference information of multi-phase seismic responses in the same exploration area. When the seismic response characteristics of non-reservoir rocks do not change with time, time-lapse seismic technology can be used to analyze the changes in reservoir characteristics such as pore pressure, porosity, fluid composition, fluid saturation, and temperature caused by production factors. Changes, so as to understand the fluid flow status and fluid composition changes in the reservoir, and provide an effective basis for formulating or updating oil and gas development plans. [0003] In the prior art, the subtraction of two time-lapse seismic data with goo...

AI Technical Summary

Problems solved by technology

However, during the implementation of time-lapse seismic exploration, especially when offshore streamers acquire time-lapse seismic data, due to the restrictions of specific construction environments and acquisition conditions such as tides, wind waves, ocean currents, etc., the shot point positions and It is difficult to precisely control the receiving position of each detector on the streamer

This makes it difficult to guarantee the repeatability of the two phases of offshore time-lapse seismic data, so that the difference seismic response obtained by subtracting the two phases of seismic data includes not only the expected difference caused by reservoir fluid changes, but also the expected difference caused by non-reservoir changes. undesired difference

Therefore, it is impossible to accurately obtain the fluid flow conditions and fluid composition changes in the reservoir based on differential seismic data, and cannot provide an effective basis for formulating or updating oil and gas development plans

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