Method and equipment for determining apparent dip angles of target layers of drill wells

Abstract

The invention provides a method and equipment for determining apparent dip angles of target layers of drill wells. The method includes acquiring layer velocity distribution of various layers according to drill well data and seismic data of the various drill wells; performing time-depth conversion on time-domain three-dimensional seismic data volumes by the aid of the acquired layer velocity distribution of the various layers to acquire depth-domain three-dimensional seismic data; capturing layer information of the target layers of the drill wells from the depth-domain three-dimensional data volumes; determining the apparent dip angles of the target layers of the drill wells on the basis of the layer information of the target layers of the drill wells. Each layer comprises a plurality of surface elements, and respective layer velocities of the various surface elements of the corresponding layers are indicated by the layer velocity distribution. The layer information of the target layers of the drill wells comprises horizontal coordinates and depth coordinates of common center points of the surface elements on the target layers of the drill wells. The method and the equipment have the advantage that the directional wells can be guided in thin reservoirs in regions with high, deep and complicated structures.

Description

technical field [0001] The present invention generally relates to the field of geophysical exploration, and more specifically relates to a method and equipment for determining the apparent dip angle of a drilling target layer in a high and steep structure area. Background technique [0002] In recent years, in the development process of most oil and gas fields in high and steep structural areas such as eastern Sichuan, in order to meet the development needs of thin reservoirs, more and more highly deviated wells and horizontal wells are used in the design process of directional wells technology. However, the thickness of many thin reservoirs in the high-steep structural area in eastern Sichuan is only about 10m, and after drilling into the target area, the well inclination angle is as high as 70 degrees or even 90 degrees sometimes, which causes drilling problems in engineering implementation. The difficulty is increasing. In order to increase the footage of the drilling tr...

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Problems solved by technology

[0006] The purpose of the exemplary embodiment of the present invention is to solve the technical problem that it is impossible to ensure that the inclination angle and the apparent dip angle of the drilling target layer are consistent to the maximum extent, and propose a method suitable for determining the drilling target layer under the conditions of high and steep structures in eastern Sichuan. Method and apparatus for tilt angle

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