Method and device for determining formation fracture distribution
A fracture and formation technology, applied in the field of petroleum exploration, can solve the problem of inability to accurately predict the spatial distribution of fractures in high dip angle formations
Active Publication Date: 2017-12-05
PETROCHINA CO LTD
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[0006] The embodiment of the present invention provides a method for determining the distribution of formation fractures to solve the problem in the prior art that conventional coherent technology cannot be used to accurately predict the spatial distribution of formation fractures at large dip angles
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[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
[0039] Considering that the existing coherence algorithm cannot accurately reflect the spatial distribution of fractures in high-dip strata, the inventors consider that the coherent attributes can be directly extracted from the original seismic data, and adjusted to first horizontally correct the original seismic data for the high-dip angle target layer, and then extract the horizontal The corrected coherence attributes of the high-dip angle target layer, so as to eliminate the adverse effect of the existence of the high-dip angle on the spatial distribution of formation fractures, and solve the...
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The present invention provides a method and device for determining the distribution of stratum fractures, comprising the following steps: acquiring a seismic data body in a work area; correcting the spatial position of the sample point value of a target layer of the seismic data body from an inclined layer to a horizontal layer; Coherent transformation is performed on the seismic data volume in the horizontal interval to obtain the coherent attribute data volume; the spatial position of the sample point value of the coherent attribute data volume in the target interval is reversely corrected from the horizontal interval to the inclined interval to obtain the stratum of the work area crack distribution. In the embodiment of the present invention, before calculating the coherent attribute, the spatial position of the sample point value of the target interval is corrected from the inclined interval to the horizontal interval, and then the coherent attribute is extracted, which effectively eliminates the influence of the high-dip formation on the fracture prediction result. interference; then the spatial position of the sample point value in the coherent attribute data volume is reversely corrected from the horizontal section to the inclined section, thereby effectively improving the prediction accuracy of the spatial distribution of fractures in the formation with a large dip angle, and ensuring the fracture prediction results accuracy.
Description
technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a method and a device for determining the distribution of formation fractures. Background technique [0002] In recent years, with the deepening of oil and gas field exploration, the oil and gas reservoirs with simple structures and easy to be exploited have gradually decreased, and people have to exploit those oil and gas reservoirs with complex structures. However, these structurally complex oil and gas reservoirs have experienced multiple structural movements, resulting in severe formation deformation, steep dip angles in many formations, and a large number of fractures. For oil and gas reservoirs, these formation fractures are not only important oil and gas storage spaces and seepage channels, but also one of the main controlling factors for the development of high-quality reservoir belts. an important research content. [0003] In complex subterranean structu...
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IPC IPC(8): G01V1/36
Inventor 马晓宇李艳东石玉梅宋建勇
Owner PETROCHINA CO LTD