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Correction method of rock salt underlying stratum structure pull-up illusion and application thereof

A correction method and stratigraphic technology, applied in the field of geophysical exploration, can solve the problem of low reliability of the correction method and achieve the effect of improving the reliability of the structure

Pending Publication Date: 2021-11-26
PETROCHINA CO LTD
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  • Application Information

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Problems solved by technology

[0003] The main purpose of the present invention is to provide a correction method and application thereof for the pull-up artifact of the underlying rock-salt stratum structure, to solve the problem of low reliability in the existing correction method for the pull-up artifact of the underlying reflection layer of the salt rock

Method used

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  • Correction method of rock salt underlying stratum structure pull-up illusion and application thereof
  • Correction method of rock salt underlying stratum structure pull-up illusion and application thereof
  • Correction method of rock salt underlying stratum structure pull-up illusion and application thereof

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Embodiment 1

[0031] The target area is: North Troyes Oilfield, the main target layer in this area is Carboniferous, and its burial depth is greater than 2000m. The complexity of this area is mainly due to the fact that there are many salt domes with uneven thickness and different sizes in the Permian Konggu stage above the Carboniferous. The thickness is 400-2000m. The seismic reflection event of the underlying strata of the salt dome appears to be pulled up.

[0032] like figure 1 As shown, the correction method is as follows:

[0033] (1) Without considering the compaction effect, the top and bottom of the 10 salt domes were statistically summarized, and the thickness time (x) of the salt domes was calculated, and the underlying reflection layer corresponding to each salt dome was pulled up Closure time (y) was also counted accordingly.

[0034] (2) Using the method of linear regression equation, the thickness time (x) of the above 10 salt domes was fitted with the pull-up closure tim...

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Abstract

The invention provides a correction method of a rock salt underlying stratum structure pull-up illusion. The correction method comprises the following steps: selecting a plurality of sample rock mounds, and obtaining the thickness time of each sample rock mound and the pull-up time of a rock salt underlying stratum corresponding to each sample rock mound; fitting the thickness time of the sample rock mound and the pull-up time of the underlying stratum of the rock salt by adopting a linear regression equation method to obtain a calibration curve; and according to the calibration curve, correcting the rock salt underlying stratum pull-up data corresponding to each target rock mound to obtain a structural map of each target rock mound. By adopting the method to correct the pull-up illusion of the rock salt underlying stratum structure, a real structure form can be restored, and the reliability of the rock salt underlying stratum structure is effectively improved.

Description

technical field [0001] The invention relates to the field of geophysical exploration, in particular to a method for correcting pull-up artifacts in rock-salt underlying formations and its application. Background technique [0002] In the salt rock area, due to the huge velocity difference between the salt rock and the surrounding rock, the seismic reflection event of the underlying formation appears to be pulled up. The traditional correction of the pull-up false image of the underlying reflective layer of salt rock is to use the horizon control method and layer velocity calculation to replace the filling velocity field, and to conduct comprehensive velocity analysis according to the actual VSP, AC, and three-dimensional superposition velocity in the work area to determine the appropriate filling replacement velocity to correct. However, in areas without VSP, it is impossible to obtain a suitable velocity to establish a velocity field, resulting in low reliability of the st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624G01V2210/64
Inventor 吴采西
Owner PETROCHINA CO LTD
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