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Q structure establishment technology based on prestack seismic channel set earth layer

A pre-stack seismic and stratigraphic technology, applied in the direction of seismic signal processing, etc., can solve problems such as difficult to determine the exact position of production layers, and achieve the effect of reducing exploration risks

Inactive Publication Date: 2010-01-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Especially when the thickness of the reservoir itself is much smaller than the seismic resolution ability, it is difficult to determine the exact position of the production layer with the data extracted from the post-stack seismic data

Method used

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  • Q structure establishment technology based on prestack seismic channel set earth layer
  • Q structure establishment technology based on prestack seismic channel set earth layer
  • Q structure establishment technology based on prestack seismic channel set earth layer

Examples

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Embodiment

[0042] Example: The natural gas reservoir in this block is located near a large steep slope and belongs to the deep basin gas reservoir. The difficulty of gas reservoir prediction in this area is that the sedimentation in the steep slope zone is complex, the inside story of the deposition is not clear, and the super strong reflection of the overlying gypsum rock layer has also caused great interference to other prediction methods. In this study, a survey line passing through the well in this area was selected to extract the formation absorption parameter profile, and this was used to guide the research on the prediction of natural gas reservoirs in this area.

[0043] In Fig. 11, (a) is the angle gather data of this block, and (b) is the stratum Q value profile extracted from the angle gather data. It can be seen from the figure that strong absorption is shown at the gas reservoir position The characteristics are basically consistent with the results of theoretical analysis. T...

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Abstract

The invention relates to a Q structure establishment technology based on a prestack seismic channel set earth layer. The technology comprises the following steps: starting from a prestack seismic channel set, and estimating a Q value of the earth layer by a time-frequency spectral decomposition technology; extracting the prestack seismic channel set; performing relative amplitude preserved processing on the seismic channel set; performing time-frequency conversion on a target reflecting layer segment in the seismic channel set; obtaining the Q value of the earth layer which changes with the offset distance by an improved spectra ratio method based on the prestack seismic channel set in a time-frequency domain; and obtaining the Q value of the earth layer with zero-offset distance by return-to-zero processing. The prestack seismic data has better results and richer information than the post-stack seismic data, so the Q structure establishment technology helps reduce exploration risk and obtain more accurate results.

Description

technical field [0001] The invention belongs to the field of seismic data interpretation, and relates to a technique for establishing the absorption characteristic parameter Q of formations by using pre-stack seismic gathers. Background technique [0002] The formation absorption feature is a very important indicator of oil and gas. So far, a variety of methods have been developed to extract the quality factor Q of the formation absorption characteristic parameter: the amplitude attenuation method in the time domain, the rise time method, and the method in the frequency domain. Spectrum ratio method, centroid frequency shift method, matching method, spectrum simulation method, etc. The above methods of extracting the intrinsic attenuation parameter Q of the formation are all based on post-stack seismic data, and the method of extracting characteristic parameters of absorption based on pre-stack seismic gathers is rare. Prestack seismic gathers contain richer amplitude, phas...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 吴国忱印兴耀王小杰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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