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Three-dimensional space homing method for speed in two-dimensional seismic data

A technology of seismic data and three-dimensional space, which is applied in seismic signal processing and other directions, and can solve problems such as migration and homing of two-dimensional seismic data

Active Publication Date: 2015-05-06
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

At present, the velocity data used are basically generated by two-dimensional surveying network technology, but due to the problem of migration and homing of two-dimensional seismic data, the layer velocity (also called horizon velocity) generated by two-dimensional surveying network cannot accurately reflect the Underground true formation velocity

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  • Three-dimensional space homing method for speed in two-dimensional seismic data
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  • Three-dimensional space homing method for speed in two-dimensional seismic data

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Embodiment Construction

[0016] Hereinafter, the three-dimensional space homing method of velocity in two-dimensional seismic data according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments. It should be noted that, in the present invention, CDP refers to a common depth point gather, and CMP refers to a common midpoint gather. When the reflective layer is approximately horizontal, CDP and CMP can be regarded as the same.

[0017] In the prior art, the horizontal section of two-dimensional seismic data (also referred to as two-dimensional seismic section, horizontal section) always displays the position of the reflection point on the reflection interface on the vertical line below the common center point on the ground. When the formation is a horizontal layered structure, this display mode is in line with the actual situation, but in fact the underground structure is relatively complex (including complex structures of faults, pinc...

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Abstract

The invention provides a three-dimensional space homing method for the speed in two-dimensional seismic data. The method includes the following steps: calculating a layer speed control point of a given layer according to stacking speed on a horizontal stacked section of the two-dimensional seismic data; conducting interpolation, surface fitting and blocking disposing on the layer data on the horizontal stacked section to build a three-dimensional geological model of the layer with a fault; utilizing a ground common midpoint that the layer speed control point of the given layer corresponds to as a stimulating point, adopting a self-stimulating self-receiving ray tracking algorithm to calculate a self-stimulating self-receiving ray reflection point on the given layer of the ground common midpoint and a homing point for the reflection point as the layer speed control point of the given layer; offsetting the layer speed of the given layer to the homing point of the layer speed control point of the given level to finish three-dimensional space homing of the layer speed control point of the given layer. By means of the method, the layer speed position can be found more accurately, and the method provides accurate initial speed for follow-up use of the speed.

Description

technical field [0001] The invention relates to the field of oil and gas seismic exploration, more specifically, to a three-dimensional space homing method for velocity in two-dimensional seismic data. Background technique [0002] With the development of mine seismic supplementary exploration, the requirements for the accuracy of seismic quantitative interpretation have also increased. The key to improving the accuracy of seismic quantitative interpretation is to have a time-depth conversion method that is closer to reality and a corresponding accurate time-depth conversion speed. At present, the velocity data used are basically generated by two-dimensional surveying network technology, but due to the problem of migration and homing of two-dimensional seismic data, the layer velocity (also called horizon velocity) generated by two-dimensional surveying network cannot accurately reflect the Underground true formation velocity. Contents of the invention [0003] In view o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 陈小二邹文陶正喜范昆夏铭王聃张洞君范晓任承豪
Owner BC P INC CHINA NAT PETROLEUM CORP
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