Method for determining complex geologic structure in two-dimensional space

Abstract

The invention provides a method for determining a complex geologic structure in a two-dimensional space according to seismic data and stratum geological data in petroleum and natural gas exploration. The method comprises the following steps: first, processing the seismic data to obtain overlaid seismic data, so as to determine horizontal distribution of an objective formation and the distribution of faults penetrating the objective formation; then determining fault shapes and contact positions between the faults and the stratum; performing fitting and interpolation on layer data, followed by connection point and undirected edge tracking so as to build a geological model undirected graph; allowing the undirected graph to be subjected to traversal processing according to a depth-first search algorithm to finally obtain a topological structure; and finally, performing traversal tracking for obtaining an inversion result. According to the invention, the method can correctly depict the characteristics of geologic structures including ordinary faults, reverse faults and the like, and depict special geologic bodies such as salt domes and lenses, and the practical geologic structures being subjected to geologic movements, such as extrusion, tension and cutting, and can accurately recognize complex structural hydrocarbon reservoir.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploration and development, and relates to a method for determining complex stratum structures in two-dimensional space according to seismic data and stratum geological data. Background technique [0002] Under the background of increasingly complex exploration conditions, the exploration of oil and gas reservoirs with complex structures has become one of the difficulties in reservoir prediction. Using seismic information to quickly and correctly express changes in stratigraphic structures such as normal faults and reverse faults, as well as complex structures such as salt domes and lenses, can determine the structural shape of underground reservoirs and improve the prediction accuracy of oil and gas reservoirs. [0003] The traditional method of determining the stratigraphic structure is to continue the basic assumption of seismic exploration, simplify the underground structure...

AI Technical Summary

Problems solved by technology

For more complex geological conditions such as salt domes and lenses, the division of interfaces will be more cumbersome, and it is difficult to clearly determine the geological structure, which will affect the structural description accuracy of the target layer

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