Pseudo three-dimensional fast microseism forward modeling method based on scanning surface forward modeling

A micro-seismic and pseudo-3D technology, applied in the field of oil and gas seismic exploration, can solve problems such as slow calculation efficiency

Active Publication Date: 2012-12-26
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

In addition, the forward modeling calculation of microseismic waves based on three-dimensional anisotropic media has the problem of slow calculation efficiency

Method used

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  • Pseudo three-dimensional fast microseism forward modeling method based on scanning surface forward modeling
  • Pseudo three-dimensional fast microseism forward modeling method based on scanning surface forward modeling
  • Pseudo three-dimensional fast microseism forward modeling method based on scanning surface forward modeling

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Embodiment Construction

[0028] In the anisotropic pseudo three-dimensional fast microseismic forward modeling method based on scanning surface forward modeling according to the present invention, by grouping microseismic sources and receiving geometric arrangements of each geophone (located on the surface or in the well), multiple two vertical plane. For each two-dimensional vertical plane, the vertical plane is projected onto the horizontal plane through vertical projection, and at this time it is a straight line on the horizontal plane. Further carry out the transformation of the rotating coordinate system, and then use the finite difference method of the anisotropic equation to calculate the first arrival travel time of the microseismic. In the calculation process, a three-scan calculation strategy is designed at the top and bottom of the model to ensure the minimum travel time.

[0029] Refer below figure 1 The anisotropic pseudo three-dimensional fast microseismic forward modeling method based...

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Abstract

A pseudo three-dimensional fast microseism forward modeling method based on scanning surface forward modeling includes that a three-dimensional (3D) horizontal isotropic anisotropic model is set up and provided with a coordinate system (X, Y, Z), a microseism origin is disposed inside the anisotropic model, and a plurality of seismic geophones are arranged on the upper surface of the anisotropic model; a two-dimensional (2D) vertical plane is set up for the microseism origin and the seismic geophones so that the microseism origin and the seismic geophones are all arranged on the 2D vertical plane; the 2D vertical plane is vertically projected in a horizontal coordinate system (X, Y) of the anisotropic model, and according to horizontal coordinates of the microseism origin and the seismic geophones in the horizontal coordinate system (X, Y), an azimuth angle theta is obtained; according to the azimuth angle theta and the coordinate transformation formula, the horizontal coordinate system (X, Y) is rotated and then a first new coordinate system X<1> Y<1> is obtained; a Z-axis of the coordinate system (X, Y, Z) and an X<1>-axis of the first new coordinate system X<1> Y<1> are used to form a second new coordinate system (X1, Z); and first arrival travel-times of microseismic waves generated from the microseism origin to every seismic geophone are calculated in the second new coordinate system (X<1>, Z).

Description

technical field [0001] The invention relates to the field of oil and gas seismic exploration, in particular to a pseudo three-dimensional fast micro-seismic forward modeling method based on scanning surface forward modeling, which is mainly applied to micro-seismic monitoring of oil seismic exploration. Background technique [0002] Microseismic fracturing monitoring technology is an important technology developed rapidly in recent years to solve the development of low permeability oil and gas reservoirs. Although microseismic fracturing was monitored in the 1970s, it was only experimental at that time. With the country's further emphasis on and demand for energy development, microseismic monitoring and research play a vital role in the development of unconventional oil and gas reservoirs such as tight sandstone and shale. In my country, at least tens of thousands of wells need microseismic fracturing monitoring every year. Microseismic technology is to describe the fractu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 尹陈刘鸿李亚林何光明巫芙蓉陈爱萍康亮巫骏
Owner BC P INC CHINA NAT PETROLEUM CORP
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