Built-up area exciting and receiving method of earthquake data in low-signal-to-noise-ratio region

A technology with low signal-to-noise ratio and seismic data, applied in seismology for logging records, etc., can solve problems such as difficult surface investigation, complex and changeable surface structure, and low signal-to-noise ratio

Inactive Publication Date: 2011-10-12
四川仁捷石油技术有限公司
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Problems solved by technology

③ The thickness of loess changes drastically, and the topography fluctuates abruptly, which makes the surface investigation extremely difficult, and the error of small refraction data is relatively large
④Complicated and changeable surface structure, weak reflection energy and low signal-to-noise ratio in the middle and deep layers in the original records
⑤Complicated terrain, vertical and horizontal gullies, severe topography fluctuations and serious differences in loess thickness, resulting in difficulties in obtaining surface static correction data
The content of these studies and the shortcomings of the receiving technology are as follows: ① Large-area combination of geophones is used to improve the signal-to-noise ratio of the data, but the large-combination receiving technology cannot suppress lateral interference and is limited by the combined height difference
② In order to overcome the special terrain and interference in the ...

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  • Built-up area exciting and receiving method of earthquake data in low-signal-to-noise-ratio region
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  • Built-up area exciting and receiving method of earthquake data in low-signal-to-noise-ratio region

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Embodiment Construction

[0033] Oil and gas fields have been discovered in a structural belt, but because the main structure is mostly covered by thick loess, the topographical fluctuations are large, and the signal-to-noise ratio of seismic data is low, it is difficult to be used for structural interpretation. At the same time, the hinterland structure of this area is complex, with developed overthrust nappe structures and thrust fold systems, fractured strata, dramatic changes in occurrence, well-developed faults and fault blocks, complex seismic wave fields, and difficult imaging.

[0034] In order to obtain seismic data with a high signal-to-noise ratio in the area covered by extremely thick loess, the patented method is used for construction.

[0035]According to the principle of "five avoidances and five actions" in seismic exploration in Huangtuyuan Mountains, the excitation point and receiving point are selected within the seismic survey line; the seismic data are obtained by using micro-VSP, m...

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Abstract

The invention provides a built-up area exciting and receiving method of earthquake data in a low-signal-to-noise-ratio region, which is used for solving the problem of poor quality of earthquake acquisition data of the low-signal-to-noise-ratio region. The method comprises the following steps of: acquiring a near-surface speed structural model through micro VSP (Vertical Seismic Profile) and micro logging information; determining an earthquake exciting depth and a wall rock speed; and determining exciting and receiving parameters by taking a built-up exciting area, a built-up receiving area and a multi-line receiving mode as core concepts and taking suppressing of external interference as a target. Compared with the conventional technology of the same type, the method has the advantages of high capabilities of suppressing noise and external interference.

Description

technical field [0001] The patent of the invention belongs to the field of seismic exploration of oil and gas, and relates to a combination area excitation and receiving method of seismic data in areas with low signal-to-noise ratio, which is effective for seismic exploration of oil and natural gas in all areas. technical background [0002] At present, the area of ​​oil and gas exploration in my country has begun to shift from searching for structural oil and gas reservoirs to searching for various hidden and complex oil and gas reservoirs, and from simple areas to complex areas. In recent years, in the seismic exploration of various complex surfaces such as deserts, mountains, and loess plateaus, it has been found that the surface structure in these areas is complex, and the excitation and reception conditions vary greatly, making the quality of seismic data in this area unable to meet the requirements for processing and interpretation. , thus restricting the further impro...

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Application Information

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IPC IPC(8): G01V1/40
Inventor 罗仁泽梁黎明黄元溢
Owner 四川仁捷石油技术有限公司
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