阿北、顺北地震低信噪比地区采集方法攻关及效果
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摘要
阿北、顺北地区位于塔北坳陷区的西部,地表、地下结构复杂,是塔里木盆地典型的低信噪比地区。该区以往的地震剖面品质差,主要目的层埋藏深且岩性致密,各层之间速度接近,层间反射系数小,资料中深层信噪比低。为了清晰成像中深层内幕,对采集方法进行了深入研究。首先根据已知资料建立地质模型,从地震采集设计入手,采用MOFLS模型正演的方法分析以往地震勘探存在问题,然后确定观测系统,以经济可行的方法确定获取更多地下目的层有效反射波资料的最佳排列长度,同时运用野外采集“现场质量监控一体化”技术。新采集的资料质量有了较大提高,达到了采集攻关的需要。
Arbei - Shunbei area, located in western part of Ta-bei depression and with complex surface and underground structures, is typical low signal-to- noise ratio areas in Tarim basin. The quality of previous seismic sections in the area are poor, the main targets are deeply buried and very tight, the velocity differences between different layers are insignificant, interlayer reflection coefficient is small, and the signal - to - noise ratio of data acquired in deep layers are low. Seismic acquisition methods are thoroughly studied in order to acquire a clear image of the deep layers. First, a geologic model is built based on the available data and MOFLS forward modeling method is used to analyze the problems of the previous seismic exploration. Then, an observation system is designed and the optimum array length is determined by using economically viable methods to acquire effective reflectance data of more targets. "Integrated in- situ quality monitoring" technology is also used in field acquisition. The quality of newly acquired seismic data is greatly improved.
Arbei - Shunbei area, located in western part of Ta-bei depression and with complex surface and underground structures, is typical low signal-to- noise ratio areas in Tarim basin. The quality of previous seismic sections in the area are poor, the main targets are deeply buried and very tight, the velocity differences between different layers are insignificant, interlayer reflection coefficient is small, and the signal - to - noise ratio of data acquired in deep layers are low. Seismic acquisition methods are thoroughly studied in order to acquire a clear image of the deep layers. First, a geologic model is built based on the available data and MOFLS forward modeling method is used to analyze the problems of the previous seismic exploration. Then, an observation system is designed and the optimum array length is determined by using economically viable methods to acquire effective reflectance data of more targets. "Integrated in- situ quality monitoring" technology is also used in field acquisition. The quality of newly acquired seismic data is greatly improved.
引文
1 李庆忠.走向精确勘探的道路[M].北京:石油工业出版社,1995
2 陆基孟.地震勘探原理[M].东营:石油大学出版社,1993
3 张红斌,牛淑琴,邓小力.塔中西部火成岩特征及其地震假构造校正[J].海相油气地质,1999,4(3):55～60
2 陆基孟.地震勘探原理[M].东营:石油大学出版社,1993
3 张红斌,牛淑琴,邓小力.塔中西部火成岩特征及其地震假构造校正[J].海相油气地质,1999,4(3):55～60
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