Seismic attribute extracting method for geologic structure containing over-thrust fault

Abstract

The invention discloses a seismic attribute extracting method for a geologic structure containing an over-thrust fault. The method comprises the following steps of: (a) performing geologic horizon interpretation and fault interpretation by using an over-thrust fault-containing seismic interpretation method; (b) connecting a corresponding geologic horizon and a corresponding fault to form a new horizon; (c) performing upper and lower layer connection on the new horizon along the position of the fault to form a closed fault block or horizon connection; and (d) calculating the seismic attribute according to the formed fault block and horizon. Because the upper and lower walls of the horizon can be simultaneously calculated by the method, at least 1 / 2 of workload can be saved; and because thedata of the lower wall of the horizon is reliable and can be used for predicting a reservoir stratum, the predictable area is enlarged. The boundary of the reservoir stratum controlled by the fault is obvious. The method can solve the problem of over-thrust fault-containing seismic attribute extraction, and has direct effect on reservoir stratum prediction, oil gas detection and the like in corresponding oil gas exploratory development.

Description

technical field [0001] The invention relates to a method for extracting seismic attributes in the field of oil and gas exploration and development, in particular to a method for extracting seismic attributes of geological structures containing overthrust faults in the field of oil and gas exploration and development. Background technique [0002] Seismic attribute extraction technology is an important reservoir prediction technology in seismic exploration, which plays a very important role in identifying the spatial distribution area of ​​reservoirs. [0003] Seismic attributes are new volume data or horizon data obtained by subjecting the original seismic data to certain mathematical transformations or a combination of mathematical transformations. The distribution of new data features in the vertical or horizontal direction is more intuitive than the original seismic data. It reflects the distribution law of the reservoir or the fluid-containing law of the reservoir, and p...

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Problems solved by technology

[0006] In order to solve the problem that the seismic attributes of the upper and lower walls of overthrust faults cannot be calculated at one time and the information of the footwall of faults is lost, the present invention provides a method of merging seismic horizons and faults into blocks to quickly extract the seismic attributes of geological structures with overthrust faults Methods

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