Deviation eliminating method for improving accuracy of structural diagram

Abstract

The invention relates to a deviation eliminating method for improving the accuracy of a structural diagram, which is shown in the figure and used for explaining two-dimensional seismic data for oil exploration. The method comprises the following steps: calculating a time constant deviation correction value of each newly tested line according to the position of each point of intersection in an imaging area; after the residual deviation correction, calculating a time variable correction value of each data point of each tested line in the imaging area according to the newly tested line; completing variable time deviation correction of all newly tested lines in a work area; recalculating the deviation value of the newly tested line after the constant correction and the variable correction; and completing the deviation correction if the integral maximum residual time deviation is less than 5 ms. The invention eliminates time errors, furthest protects original data, avoids aberration phenomena of the structure and artificial edition afterwards, enables the whole space correction result to be more accurate and reasonable, ensures the accuracy of the structural diagram and is beneficial to the accurate explain of an underground structure.

Description

technical field [0001] The invention relates to petroleum exploration and development technology, in particular to a deviation elimination method for improving the accuracy of structural diagrams in interpreted diagrams of two-dimensional seismic data. Background technique [0002] In oil exploration, the seismic data formed after two-dimensional seismic information processing is often used for interpretation. The data formed in this way are arranged in traces in the horizontal direction, and there may be several traces. There are several discrete time domains in each trace vertically. The point data for , displayed as a seismic section plot. Two-dimensional seismic data interpretation is to identify and track horizons and faults from the obtained two-dimensional seismic data. After processing and analysis, a structural map is formed, and then a comprehensive evaluation of petroleum geology is carried out. [0003] Spatial correction and structural mapping of 2D seismic dat...

AI Technical Summary

Problems solved by technology

Compare Figure 2 and Figure 1 can It is found that the time difference of the new survey line at the intersection position becomes much smaller after spatial homing, but there are still many places greater than 30ms

If this time is not corrected spatially, it will definitely have a great impact on the later structural mapping results. Figure 3 is is directly used Figure 2 The time structure map formed by the time data after showing the spatial homing, it can be seen from the figure that the formed structure map has undergone a large structural distortion, resulting in inaccurate map results, and it is difficult to obtain ideal results even through manual editing in the later stage. Figure results

This inaccuracy often directly leads to errors in later drilling

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