Method for filling isoline of petroleum seismotectonic map

Abstract

The invention discloses a method for filling an isoline of a petroleum seismotectonic map, wherein the isoline of the petroleum seismotectonic map is built by using cross-sectional data after analysis and interpretation of seism and by using a triangulated irregular network. The method comprises the following steps: creating the isoline of the petroleum seismotectonic map by a common method of generating the isoline by using grids, building the triangulated irregular network by the Delaunay triangle principle, extracting a skeleton line, traversing a triangle by taking a line segment between every two points on the isoline as a restriction, extracting and deleting all the triangles intersecting with the line segment, locally rebuilding the triangulated network, and directly filling each triangle at equal intervals or gradually to generate the seismotectonic map. The method can fill an area between two optional isolines by filling each triangle, and has the advantages of high speed and precision when compared with the traditional coverage type filling method.

Description

technical field [0001] The invention relates to petroleum exploration technology, in particular to a filling method for establishing isolines of petroleum seismic structure diagrams by utilizing seismic acquisition and interpretation section data and using an irregular triangular network (TIN). Background technique [0002] Specifically, the seismic structure map is the final and most important result map of seismic exploration work, and is one of the main reference materials for providing well locations for drilling. Petroleum seismic tectonic map is a kind of map (planar or three-dimensional) based on seismic data. It uses isolines (isobath or isochrone) and some symbols to visually show the depth of a certain stratum. The undulating shape of the ground. It usually uses two kinds of sections in seismic data interpretation: the section expressing depth in time (seconds) is called time section, and the section expressing depth in meters is called depth section. The structu...

AI Technical Summary

Problems solved by technology

[0005] Overlay filling directly affects the speed and accuracy of the contour line of the seismic structure map, and it cannot realize gradual filling

Especially in the case of irregular inner and outer boundaries and arbitrary equivalence intervals, it is difficult to establish the topological relationship between the isolines of the seismic tectonic map

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