| 煤田三维地震勘探的观测系统设计现状与讨论 |
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| 引用本文： | 常锁亮,;唐永洪,;陈强,;郝治国.煤田三维地震勘探的观测系统设计现状与讨论[J].中国煤炭地质,2008(9):50-54. |
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| 作者姓名： | 常锁亮 ;唐永洪 ;陈强 ;郝治国 |
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| 作者单位： | [1]中国地质大学,北京100083; [2]山西山地物探技术有限公司,山西晋中030600; [3]云南省煤田地质局地质处．云南昆明650034,山西晋中030600; |
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| 摘 要： | 根据煤田三维地震观测系统设计现状,指出常规的的评价参数已不能完整反映观测系统的性能。在煤田精细构造和岩性勘探中,还需增加对采集脚印、反射弥散、目的层照明度和照明率等属性的分析。通过对几种观测系统从循环节、唯一炮检距覆盖次数、炮检距变化系数等属性的分析讨论,认为：①对目前常用的1/2横向滚动的束状观测系统应通过减少滚动线数进行优化;②在低信噪比和静较正问题突出、勘探目的以构造为主的地区,应采用有利于构造成像的窄方位观测系统,在高信噪比和静较正问题不突出的地区,应采用有利于提高分辨率和储层预测的宽方位观测系统;③同类型观测系统就其面元属性而言,斜交型观测系统普遍优于正交型观测系统。
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| 关 键 词： | 三维观测系统 循环节 唯一炮检距覆盖次数 炮检距变化系数 采集脚印 |
Status Quo and Discussion on Coalfield 3D Seismic Prospecting Recording Geometry Design |
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| Institution: | Chang Suoliang, Tang Yonghong, Chen Qiang and Hao Zhiguo (1. China University of Geoseiences (Beijing), Beijing 100083; 2. Shanxi Shandi Geophysical Prospecting Technological Co., Ltd., Jinzhong, Shanxi 030600; 3. Geological Division, Yunnan Bureau of Coal Geological Exploration, Kunming, Yunnan 650034) |
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| Abstract: | Based on the status quo of coalfield 3D seismic prospecting recording geometry design, pointed out that the conventional assessment parameters can not reflect the performance of recording geometry. In coalfield precision structural and lithologic prospecting needs to adding attribute analysis for acquisition footprint, reflective dispersion, target illumination intensity and utilization coefficient etc. Through some recording geometry loop body, unique offset fold and offset variability coefficient attribute analysis and discussion, suggested： ① With regard to 1/2 transversal looping bunchy recording geometry in common use at present should be optimized through loop number reducing; ② In structural prospecting areas with low S/N ratio and protruding problems of statics should use narrow azimuth recording geometry in favor of structure imaging, while in high S/N ratio, less problems of statics areas should use wide azimuth recording geometry in favor of resolution improving and reservoir prediction; ③ Similar typed recording geometry with regard to its bin attribute, the skew-swath type gains advantage over orthogonal-swath type recording geometry at large. |
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| Keywords: | 3D recording geometry loop body unique offset fold offset variability coefficient acquisition footprint |
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