A method and device for constructing time-lapse seismic data of offshore streamers
A technology of time-lapse seismic and construction method, which is applied in the direction of seismic signal processing, etc., which can solve the problem that the receiving position of the geophone at the shot point is difficult to be accurately controlled, the repeatability of seismic data is difficult to be guaranteed, and the fluid composition of the reservoir fluid flow cannot be accurately obtained. Changes and other issues, to achieve good collection consistency, improve repeatability, and good repeatability
Active Publication Date: 2017-10-17
BC P INC CHINA NAT PETROLEUM CORP +1
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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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[0043] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.
[0044] The specific implementation of the embodiment of the present application will be described in detail below with several specific examples.
[0045] The first embodiment of a method for constructing time-lapse seismic data of offshore streamers of the present application is firstly introduced below. figure 1It is a flow chart of th...
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Embodiments of the present application provide a method and device for constructing time-lapse seismic data of offshore streamers. The method includes: acquiring the first phase of time-lapse seismic data and the second phase of time-lapse seismic data in advance; traversing each shot point in the first phase of time-lapse seismic data, and traversing the time-shift of the first shot point Each offset pair in the seismic data. Obtain the time-lapse seismic data of the first shot point from the time-lapse seismic data of the first period; determine the time-lapse seismic data of the second period within the preset circle range; obtain the first shot in the time-lapse seismic data of the first shot point Checked information; judge whether the information of the offset pair in the second period of time-lapse seismic data within the preset circle range matches the information of the first offset pair; In the second phase of time-lapse seismic data, the information of the offset pairs that meet the preset conditions is selected as the constructed time-lapse seismic data. The technical solutions provided by the embodiments of the present application can effectively improve the repeatability of the two-phase 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...
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IPC IPC(8): G01V1/28
Inventor 张立彬凌云邹振
Owner BC P INC CHINA NAT PETROLEUM CORP