Concealed fault identification method
A fault identification and concealment technology, applied in the field of concealed fault identification, can solve the problem of low identification accuracy
Pending Publication Date: 2021-02-23
CHINA PETROLEUM & CHEM CORP +1
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[0007] The purpose of the present invention is to provide a concealed fault identification method for solving the problem of low identification accuracy in the prior art
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[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0029] The basic concept of the present invention is: determine the corresponding relationship between the seismic frequency of the target area and the minimum fault distance, and then use this relationship to carry out forward modeling simulation on the A well-B well connected fault geological model, and A-B well connected Comparing the well forward modeling simulation section with the actual seismic section of Well A-B, the hidden fault between Well A and Well B is identified, and further combined with coherent slices and arbitrary line sections, the hidden fault is described in detail.
[0030] Specific steps include:
[0031] Step 1. For a certain target area, various data are obtained, including three-dimensional seismic data and well logging ...
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The invention provides a concealed fault identification method which comprises the following steps: establishing geological models with different fault distances according to three-dimensional seismicdata of a work area to carry out forward modeling, determining a corresponding relationship between seismic frequency and minimum fault distance of the work area, and carrying out forward modeling ona well A and well B continuous well fault geological model to obtain a hidden fault identification result. And comparing the A-well and B-well continuous forward modeling profile with the A-well andB-well continuous actual seismic profile, identifying the concealed fault between the A well and the B well, and finally, finely describing the concealed fault in combination with the coherent slicesand the seismic profile. The method solves the problem that concealed faults cannot be accurately recognized in a traditional method, can be applied to potential tapping of remaining oil of oil and gas reservoirs in the next step, formulation of injection-production policies, deployment of well positions and the like, and lays a solid foundation for deployment of exploration wells and developmentwells in the next step.
Description
technical field [0001] The invention belongs to the technical field of oil and gas exploration and development, and in particular relates to a concealed fault identification method. Background technique [0002] Subtle faults refer to faults derived from high-order faults with a fault throw between 5 and 30m. Because of their small fault throws and short extension distances, drilling is often impossible to drill, so it is difficult to use conventional logging methods and geophysical methods. Identification, with strong concealment. [0003] Current identification methods for hidden faults include: [0004] The first method: the Chinese patent application document with the application number of 201610683136.6 discloses a method to improve the identification accuracy of hidden faults, which is to find out the signals in the dominant frequency band and extract the sensitive fault attributes by performing frequency division processing on the seismic data. Improve the identific...
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IPC IPC(8): G01V1/30
CPCG01V1/306
Inventor 张成富徐田武程秀申蔡其新王振华李清辰刘军胡青琴
Owner CHINA PETROLEUM & CHEM CORP