A method and device for realizing geosteering

Abstract

The invention discloses a method and device for achieving geological steering. The method for achieving geological steering comprises the steps of conducting three-dimensional seismic inversion on a preset block according to a logging curve and seismic pure wave data of a drilled well in the preset block to obtain a seismic inversion result, designing a well hole track according to the seismic inversion result and establishing a three-dimensional geological guide model of the block where the well hole track is located; obtaining a well logging curve during drilling of a drilling point in the well drilling process of the well hole track, judging whether the well logging curve during drilling of the drilling point is matched with the seismic inversion result or not and continuing to drill according to the well hole track till a new drilling point is reached, wherein the well logging curve during drilling is matched with the logging curve of the drilling point simulated according to the three-dimensional geological guide model, and a drill bit corresponding to the drilling point is located at the optimal position of a reservoir. By means of the scheme, due to the fact that the seismic inversion result can well predict anisotropism of the reservoir in the horizontal direction, the drilling-encountering rate of the reservoir is improved.

Description

technical field [0001] The invention relates to well logging technology, especially a method and device for realizing geosteering. Background technique [0002] Geosteering technology refers to the process of horizontal drilling, making full use of logging while drilling (LWD, Logging While Drilling) data and logging while drilling data, combined with seismic and geological data and engineering design, to timely and accurately divide the drilled strata, and predict the formation to be drilled. Formation, real-time adjustment of wellbore trajectory, so that the actual drilling trajectory accurately drills the target layer, and is always in the best position of the oil layer. [0003] Existing geosteering methods roughly include: [0004] According to the logging data of adjacent wells to be drilled (such as GR curve, resistivity curve, logging interpretation conclusions, geological stratification, etc.) and regional geological reservoir data, determine the target point and d...

AI Technical Summary

Problems solved by technology

Therefore, it cannot truly reflect the actual structural relief of the formation, resulting in a low drilling rate of the reservoir

On the other hand, the logging-while-drilling tool has a certain distance from the drill bit, the shortest is about 4 meters (m), so it cannot detect the physical property changes of the formation at the drill bit, and cannot provide an accurate adjustment plan for the wellbore trajectory in time, resulting in reservoir failure. low drill rate

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