Method and device for determining micro-logging point position and well depth in complex surface area

Abstract

The embodiment of the invention provides a method and apparatus of determining point location of a well and well depth through micro-logging in a complicated surface region. The method of determining point location of a well and well depth through micro-logging in a complicated surface region includes the steps: performing first-arrival travel time tomographic inversion on each measuring line in the specified seismic prospecting acquisition data in a work region to obtain the near-surface velocity field of each measuring line; based on the existing micro-logging explanation result in the work region, calibrating the velocity amplitude of the high velocity top interface of each near-surface velocity field; according to the velocity amplitude of the high velocity top interface of each near-surface velocity field, determining the weathered layer thickness of each shot point and demodulator probe on the corresponding measuring line of each near-surface velocity field; and according to the weathered layer thickness of each shot point and demodulator probe on the corresponding measuring line of each near-surface velocity field, predicting the weathered layer thickness of the work region; and according to the weathered layer thickness of the work region and the preset micro-logging density, determining the micro-logging parameter of the work region. The method and apparatus of determining point location of a well and well depth through micro-logging in a complicated surface region can improve the surface layer investigation efficiency and reduce the surface layer investigation cost.

Description

technical field [0001] The present application relates to micro-logging technology, in particular to a method and device for determining micro-logging points and well depths in complex surface areas. Background technique [0002] In geophysical prospecting, surface survey is the first procedure in the process of field seismic acquisition, and it is also an essential basic work. The near-surface model obtained by interpolating the interpretation results of the surface survey can provide basic data for the calculation of field statics, the design of the excitation well depth model, and the design of the height difference of the geophone combination, and can also provide data for pre-stack depth migration processing. Accurate near-surface velocity fields. It can be seen that the surface survey process is directly related to all aspects of seismic exploration in the subsequent seismic acquisition process, such as excitation, reception, field processing, and pre-stack depth migr...

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Problems solved by technology

However, this layout method has certain disadvantages. If the regolith thickness exceeds the limit of the drilling rig's drilling capability within a large area of ​​the same surface lithology, if the micro-logging survey is still carried out according to the regular density, then the area between Every micro-logging survey in the country cannot obtain the required high-speed layer velocity and the thickness and velocity of the weathered layer between the top interface and the surface, so the purpose of surface survey cannot be achieved

[0007] Since the surface survey is the first process of seismic acquisition, if this process is not completed, the subsequent processes cannot be carried out

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