Improved method for characterizing oil or gas reservoir evolution over time

A technology for reservoir characterization, applied in seismic signal processing and other directions, which can solve problems such as limiting the effectiveness of reservoir engineers

Inactive Publication Date: 2014-10-01
TOTAL PUTEAUX FR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This delay limits the usefulness of these results to reservoir engineers, who need as timely information as possible to make decisions about field management

Method used

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  • Improved method for characterizing oil or gas reservoir evolution over time
  • Improved method for characterizing oil or gas reservoir evolution over time
  • Improved method for characterizing oil or gas reservoir evolution over time

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Embodiment Construction

[0054] first reference Figure 2a and Figure 2b , shows a reservoir, generally indicated by reference numeral 10 , containing hydrocarbons 12 in the subsurface 14 . A sonar transmitter 18 and receiver array 20 are located on a survey vessel 16 , which is the source of sound, and which surveys by navigating over the reservoir 10 . The first or initial survey ( Figure 2a ) can be referred to as a base survey and is usually carried out during the exploration phase before production begins.

[0055] A base survey of the reservoir 10 provides a collection of seismic traces at a first time T. For a given seismic trace, the base survey provides the amplitude b(t) as a function of time t; where, with the value t i The set (i is the index) samples the digitally recorded and digitally processed traces; a typical trace length corresponds to about 1000 samples. Then, the seismic traces are processed as values ​​b(t i ) or b i collection.

[0056] To extract hydrocarbons 12, one ...

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Abstract

The present invention discloses a method for characterizing the evolution of a reservoir over time, the method comprising the steps of: providing a base survey of the reservoir and a plurality of monitoring surveys, each survey having A collection of seismic traces; deriving an optimal regularized weight map from a combination of at least three surveys; and performing an inversion using the optimal regularized weights to obtain an improved seismic image over time between pairs of seismic surveys.

Description

technical field [0001] The present invention relates generally to the field of earth sciences, and more particularly to seismic data processing. In particular, the present invention relates to a method for extracting changes in 3D seismic datasets collected during production over time for use in conjunction with production data and to aid in understanding and controlling (reservoir) to extract oil and natural gas or to inject other liquids into a reservoir. Background technique [0002] In the oil and gas industry, seismic surveys are often performed in order to provide images of the subsurface to identify accumulations of hydrocarbons or other liquids. In seismic surveying, elastic waves are emitted from specific locations (wavefields) by one or more sources in a pressure or surface motion modulated manner, at or below the surface of land or ocean or in a borehole. This wavefield propagates from the source through the subsurface to a distance. Along with this propagation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
CPCG01V1/30G01V1/308
Inventor 安德里亚·格兰迪
Owner TOTAL PUTEAUX FR
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