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Method and system for processing four-dimensional seismic data in detection of coal field goafs

A 4D seismic and data processing technology, applied in seismic signal processing, etc., can solve problems such as difficulties in improving the reliability of goaf interpretation results

Active Publication Date: 2019-06-14
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Problems solved by technology

Four-dimensional seismic technology is rarely used in coalfield exploration. At present, it has only been tried in Daliuta Mine in northern Shaanxi and Zhangji in Huainan. However, it has only made certain predictions on the changes in seismic data and the degree of collapse and compaction of strata before and after coal mining. research, but did not conduct in-depth research on factors such as goaf changes, development speed, activity range, and mining methods during the observation period
Generally, the identification of gobs in 3D seismic surveys is mainly based on the strong amplitude and continuity of coal seam reflection events, and the characteristics of goaf reflections are disordered and missing. Simply relying on this feature to explain, the interpretation results of gobs are reliable Difficult to improve sex

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  • Method and system for processing four-dimensional seismic data in detection of coal field goafs

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Embodiment Construction

[0064] The present invention provides a method for processing and interpreting gobs based on four-dimensional seismic technology, which is realized through the following steps:

[0065] The first step, data analysis

[0066] 1. Analysis of acquisition factors

[0067] The first collection was in November 2013, and the second collection was in March 2018. The collection time span is 5 years, and the exploration area is 1.7km 2 and 1km 2 . The same conditions for the two acquisitions include: similar surface temperature and precipitation, instrument model, beam observation system (8 lines and 8 processing), receiving track spacing (10m), receiving array (40m), shot distance (80m), and design coverage times (24 times) and maximum offset (524m), explosive source excitation, geophone model (60Hz simulation), geophone position (basically coincident); different conditions are: the overall position of the shot point has a deviation of 20m, and there are many variations. Generally ...

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Abstract

The invention relates to a method and a system for processing four-dimensional seismic data, belongs to the field of geological detection and particularly relates to a method and a system for processing four-dimensional seismic data in detection of coal field goafs. The method and the system are capable of monitoring changes of coal mining activities and goafs according to the change of amplitudeof vibration along with time lapse based on formation characteristics of the coal field goafs by taking a four-dimensional seismic technology for monitoring reservoir development and CO2 storage, determining the range of the coal mining activities in the time period according to changes of the range and the shape of the amplitude of vibration, deducing whether the coal mining activities exist under the ground in the period and deducing the used coal mining methods and coal mining speeds.

Description

technical field [0001] The invention relates to a four-dimensional seismic data processing method explanation and system, belonging to the field of geological exploration, in particular to a four-dimensional seismic data processing method and system in the detection of coalfield gobs. Background technique [0002] The 4D seismic technology is widely used in the oil field development process, and has certain applications in the dynamic monitoring of the oil recovery process, the analysis of the migration direction of oil and gas, and the monitoring of the distribution range of remaining oil. In addition, with the improvement of environmental protection requirements, carbon storage technology has been vigorously promoted around the world, and 4D seismic technology has been used in CO 2 Aspects of dynamic monitoring during injection and storage are also widely used. Four-dimensional seismic technology is rarely used in coalfield exploration. At present, it has only been tried ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 张宪旭杨光明程建远叶树刚李元杰
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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