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Processing method for correcting VSP downgoing waves according to actual drilling trajectory

A processing method and drilling technology, applied in the field of seismic exploration and development, can solve problems such as large errors in VSP data

Active Publication Date: 2013-06-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The relatively large depth is the target layer of exploration, so the conventional processing of VSP data will have a relatively large error in the deep layer

Method used

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  • Processing method for correcting VSP downgoing waves according to actual drilling trajectory
  • Processing method for correcting VSP downgoing waves according to actual drilling trajectory
  • Processing method for correcting VSP downgoing waves according to actual drilling trajectory

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Embodiment Construction

[0077] figure 1 Among them, the VSP data of Well 1 was collected in 2002, and the exploration headquarters could not use the data of this well below 4200 meters VSP processed by several processing units. From the drilling trajectory map of Well Zhong 1 in a certain basin ( figure 2 ) It can be seen that the VSP time error is caused when the drilling trajectory deviates from the center vertical line, and the VSP data cannot be interpreted because the drilling trajectory deviates too much from the center vertical line without correction, and it affects the interpretation of seismic data.

[0078] image 3 , Figure 4 Parameter Description:

[0079] x: the distance from the wellhead to the excitation point of the ground source

[0080] x 1 : The distance between the VSP geophone and the vertical line on the ground to the excitation point of the ground seismic source in drilling

[0081] h: the depth received by the VSP geophone in the well

[0082] s: is the travel time pa...

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Abstract

The invention belongs to the field of seismic exploration and development, and in particular relates to a processing method for correcting vertical seismic profiling (VSP) downgoing waves according to an actual drilling trajectory. The method comprises the following steps of: 1, detecting wellbore trajectory data and seismic data; 2, solving a distance d from a VSP detector to a midperpendicular,and travel-time drilling trajectory data s and s1 at the depth h according to the input seismic data; 3, calculating the travel-time path error at the depth h; 4, analyzing and correcting an error; and 5, outputting. The correction method solves the problem that the VSP downgoing waves have a path error so as to cause a speed error solved by time, and the accuracy for VSP exploration is improved.The correction method performs correction under the condition of an isotropic medium, the data of the VSP downgoing waves is corrected according to the direction of the wellbore trajectory and bias data, and the degree of accuracy is higher. A certain error is present when the method is used under the assumed condition of an anisotropic inhomogeneous medium.

Description

technical field [0001] The invention belongs to the field of seismic exploration and development, and in particular relates to a processing method for correcting VSP downgoing waves according to actual drilling trajectories. Background technique [0002] In the prior art, when dealing with VSP data, it is generally assumed that oil drilling is regarded as 90 degrees vertical to the ground, and the degree of deviation between the drilling and the center vertical line due to construction factors is basically not considered. As the degree of petroleum exploration becomes higher and higher, the requirements for the accuracy of VSP data collection and processing are also higher and higher. For example, in lithology exploration and small-scale structural exploration, the sensitivity to speed requirements is relatively high, because the speed accuracy requirements are high. , when there is an error in the speed, it is easy to affect the effect of exploration. Usually, the velocity...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
Inventor 何晓冬赵群周枫刘路佳吴永栓
Owner CHINA PETROLEUM & CHEM CORP
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