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Optimizing design method of observing system

An observation system and optimized design technology, applied in the field of geophysical exploration, can solve problems such as inappropriateness and inability to reflect imaging effects

Inactive Publication Date: 2015-03-18
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

Conventional coverage times refer to the number of midpoints in a bin, and the coverage times have nothing to do with the subsurface model and have no direct relationship with the imaging effect, so it cannot reflect the high-quality imaging effect of seismic exploration
The method of mid-point coverage is also not suitable for the design and evaluation of observation systems in complex areas

Method used

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  • Optimizing design method of observing system
  • Optimizing design method of observing system
  • Optimizing design method of observing system

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Embodiment Construction

[0031] Below in conjunction with example and accompanying drawing describe in detail.

[0032] The two initially proposed observation systems are:

[0033] Observation system 1: 16 lines, 6 shots, 112 orthogonal channels, track distance 50 meters, shot distance 50 meters, receiving line distance 300 meters, excitation line distance 300 meters;

[0034] Observation system 2: 18 lines, 6 shots, 120 orthogonal channels, track distance 50 meters, shot distance 50 meters, receiving line distance 300 meters, excitation line distance 300 meters.

[0035] 1) According to the existing interpretation profile, establish the corresponding velocity model, figure 1 is the established three-layer interface velocity model;

[0036] Combined with geological tasks, the third layer interface in the model is determined as the target body to be analyzed, figure 2 It is a screenshot when only the third-layer interface is displayed.

[0037] 2) Emit rays along the normal direction from the inte...

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Abstract

The invention relates to an optimizing design method of an observing system for geophysical exploration. The optimizing design method comprises the following steps of when the imaging travel of a target body is tracked by rays, converting a speed model to obtain a root mean square speed field, simulating shooting for a primarily proposed observing system, ensuring a full-coverage area to cover all target bodies, performing the integral pre-stack time migration on a shot-geophone pair in the root mean square speed field, obtaining the effective coverage spectrum of the target bodies, and selecting the proposed observing system with high coverage times, so as to complete the optimizing design of the observing system. The optimizing design method has the advantage that the illumination intensity of the observing system on underground complicated mediums is quickly and accurately calculated, so the qualities of different observing systems are evaluated, and the effect is good.

Description

technical field [0001] The invention relates to a geophysical exploration method, which is an observation system optimization design method for judging the advantages and disadvantages of the observation system by analyzing the effective coverage spectrum of pre-stack migration of different observation systems. Background technique [0002] Petroleum geophysical exploration is based on the theory of geophysics and petroleum geology, using corresponding geophysical instruments and equipment to record underground information on the earth's surface (including land and sea), or in the air and wells, and through corresponding data processing and interpretation Obtain the physical properties (elasticity, electrical properties, magnetism, density, radioactivity) and structure of underground formations, and find oil and natural gas hidden in the formations. [0003] Seismic prospecting is a commonly used method in geophysical prospecting. When implementing seismic prospecting, it is...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 李伟波李培明胡永贵吴迪李焓
Owner BC P INC CHINA NAT PETROLEUM CORP
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