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Rock stratum occurrence calculation method and system
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A calculation method and technology of rock formation, applied in the field of calculation method and system of rock formation, can solve the problem that the occurrence is difficult to conform to the actual geological situation
Active Publication Date: 2021-01-26
CHINA UNIV OF GEOSCIENCES (WUHAN)
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[0005] The technical problem to be solved by the present invention is to provide a method and system for calculating the occurrence of rock strata in view of the defects of the prior art that the occurrence obtained by the interpolation method is difficult to conform to the actual geological conditions in areas with complex structures or sparsely measured occurrences
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Embodiment 1
[0043] Please refer to figure 1 , which is a flow chart of the first embodiment of a method for calculating the occurrence of rock strata in the present invention, the method comprising:
[0044] S100. Acquiring the actual measured occurrence and from the measured occurrence The weight coefficient ω determined by the uncertainty of unc,M ; Obtain geological plan and section, geophysical plan and section interpretation map, and extract stratum extension direction from them and extending from strata The weight coefficient ω determined by the uncertainty of unc,E ;
[0045] Under the current steps, the first aspect needs to be clarified that the uncertainty of the measured occurrence can be estimated based on the estimation during field collection, drawing standards, etc. The weight setting range corresponding to uncertainty is 0≤ω unc,M ≤1, where the greater the estimated uncertainty, the smaller the corresponding weight.
[0046] In the current step, the second aspe...
Embodiment 2
[0082] In order to ensure the accuracy of the output data, please refer to figure 2 , which is a flow chart of the second embodiment of the method for calculating the occurrence of rock formations of the present invention, in combination with Embodiment 1, after step S700, it also includes:
[0083] S800. Based on the accuracy value of the output projection occurrence, determine whether to use the projection occurrence output result in step S700.
[0084] Specifically, step S800 includes the following sub-steps:
[0085]S810. When the accuracy of the rock formation projection occurrence meets the preset requirements, use the output result of step S700; if not, execute step S820;
[0086] S820, using the traditional nonlinear algorithm, taking θ as the variable to be optimized, and using the projection occurrence obtained in step S700 The corresponding parameter angle is the initial solution, and the objective optimization function ObjFunc constructed in the optimization st...
Embodiment 3
[0090] Please refer to image 3 , which is a structural schematic diagram of the first embodiment of a calculation system for rock formation occurrence in the present invention; the system includes:
[0091] Data acquisition unit 10, used to acquire the measured occurrence and from the measured occurrence The weight coefficient ω determined by the uncertainty of unc,M ; Obtain geological plan and section, geophysical plan and section interpretation map, and extract stratum extension direction from them and extending from strata The weight coefficient ω determined by the uncertainty of unc,E ;
[0092] The initial occurrence setting unit 20 is used to extend the direction of the stratum in the extraction set the initial status
[0093] The cross-validation occurrence calculation unit 30 is used to calculate the cross-validation occurrence at the measured occurrence point by using an interpolation calculation algorithm and the initial occurrence at the point in t...
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Abstract
The invention discloses a rock stratum occurrence calculation method and system. The method comprises the steps of obtaining an actual measurement attitude and a weight coefficient corresponding to the actual measurement attitude; obtaining a geological planar graph and profile and a geophysical planar graph and profile interpretation graph, and extracting a stratum extension direction and a corresponding weight coefficient from the interpretation graphs; setting an initial occurrence at the extracted stratum extension direction; calculating the cross validation occurrence of the initial occurrence at the actual measurement occurrence point and the stratum extension direction point by using an interpolation calculation algorithm; expressing the cross validation occurrence of the initial occurrence at the stratum extension direction point by using the parameter angle theta, and calculating a projection occurrence corresponding to the parameter angle theta by using a projection calculation method; calculating included angles between the actual measurement occurrence and the cross validation occurrence at the actual measurement attitude point and between the cross validation attitudeat the stratum extension direction point and the corresponding projection occurrence; and combining the two obtained included angles to construct a target optimization function, and finally performingiterative optimization on the target optimization function to calculate the optimal projection occurrence.
Description
technical field [0001] The invention relates to the field of geological structure interpretation, more specifically, to a calculation method and system for rock formation occurrence. Background technique [0002] The occurrence of rock formations is an important basis for geologists to understand geological structures, and is widely used in two-dimensional and three-dimensional geological mapping, qualitative and quantitative geological interpretation, etc. However, due to factors such as overburden, topography, and funding, the measured occurrences are often unevenly and sparsely distributed, especially in surface coverage areas and underground. How to automatically add a large number of occurrences that are widely distributed and conform to geological structures has always been an important problem in 3D geological modeling or fine structure interpretation. [0003] From the computational point of view, the existing methods of adding occurrences can be roughly divided int...
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