Method for designing cannon well depths based on microlog and non-seismic data

Abstract

The invention relates to a method for designing cannon well depths based on microlog and non-seismic data. The method comprises the steps that the well depths are initially designed, the surface structure is surveyed in a non-seismic mode, an interpretation profile map of the surface structure is obtained, the depths of all exciting points are spread and drawn in the map, the adjusted exciting depths and the lengths of explosive columns are added, and the comprehensively-designed cannon well depths are obtained. The method for designing the cannon well depths based on the microlog and the non-seismic data can compensate for the defect that the density of the microlog is relatively low, after the non-seismic comprehensive surface survey is implemented, it can be ensured that the exciting points of seismic cannons are located in favorable exciting layers, so that it is ensured that the explosive exciting energy can effectively spread towards the underground deep layer, and an effective mean is provided for obtaining effective deep layer seismic reflection signals, improving the seismic effect and solving the problem of a deep layer structure. Due to the fact that the number of drilling wells in seismic exploration is huge, and the operation of reducing the exciting depth in a sand and mud layer to the reasonable small depth also has obvious economic significance on lowering the seismic exploration cost.

Description

technical field [0001] The invention belongs to the acquisition technology of seismic exploration data, in particular to a method for designing the depth of a cannon well based on micro-logging and non-seismic data. Background technique [0002] The choice of seismic exploration excitation lithology is directly related to the exploration effect and the quality of the finally obtained seismic data. With good and suitable excitation lithology, the excitation energy obtained by the same dose is much greater. The magnitude of the excitation energy transmitted down is one of the most important factors determining whether seismic exploration can obtain good data. The downlink energy is weak, which will reduce the signal-to-noise ratio, and it is even difficult to obtain effective reflection information in the middle and deep layers. Therefore, designing a reasonable excitation well depth and optimizing the excitation lithology are crucial links in seismic exploration, especially ...

AI Technical Summary

Problems solved by technology

For areas with complex surface structures and lateral lithology changes, it is difficult to accurately control the spatial distribution of surface lithology with limited micro-logging density, unless the micro-logging density is greatly increased. However, due to the problems of exploration cost and construction efficiency, in actual Difficult to implement in seismic exploration

Therefore, it is difficult to accurately establish a complex surface structure model by relying on the conventional method of micro-logging data to design the excitation well depth, and cannot ensure the excitation in favorable lithology, which directly affects the quality of seismic data and exploration effect

[0005] Another method of seismic cannon excitation well depth design is to design well depth based on surface survey small refraction data. This method is only suitable for areas with relatively simple surface structure, good stratification, and little lateral change in lithology. It is not applicable to areas where speed reversal exists

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