APPLICATION OF WIDE-AZIMUTH AND BROADBAND AMPLITUDE PRESERVING PROCESSING TECHNIQUE IN SHALE OIL EXPLORATION
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摘要:
中国页岩油勘探进入了全新的勘探领域，页岩油储层比常规储层复杂得多，如何提高页岩油储层的成像精度是页岩油地震勘探的关键环节.宽方位三维地震技术是目前普遍采用的地震勘探技术，因为宽方位地震在提供高品质地震资料的同时还能够解决相对较难的地质问题.以松辽盆地齐家古龙凹陷Y88研究区为例，利用宽方位资料进行针对页岩油储层处理，分析了宽方位资料的波场特征、信噪比及频率等特征，在此基础上确定了宽方位资料的处理流程，并采用了宽方位、宽频带的高分辨率保幅特色处理技术进行处理，取得较好的成像结果.
Abstract:Shale oil exploration in China has entered a new field. As shale oil reservoir is much more complex than conventional reservoir, the improvement of imaging accuracy of shale oil reservoir is the key to shale oil seismic exploration. The wide-azimuth 3D seismic technique is widely used in seismic exploration currently as it can solve relatively difficult geological problems while providing high-quality seismic data. Taking the study area Y88 in Qijia-Gulong depression of Songliao Basin as an example, the paper conducts shale oil reservoir processing by wide-azimuth data, and analyzes the characteristics of wave field, signal-to-noise ratio and frequency. On this basis, the processing flow of wide-azimuth data is determined and the wide-azimuth and broadband high-resolution amplitude-preserving processing technique is adopted for better imaging.
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Key words:
- shale oil exploration /
- wide azimuth /
- broadband /
- amplitude preserving /
- imaging accuracy
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表 1 Y88北三维地震采集观测系统
Table 1. 3D seismic acquisition geometry in northern Y88 area
名称 参数 名称 参数 观测方式 正交 观测系统 24L4S256R 纵向排列方式 2550-10-20-10-2550 接收道数/道 6144 面元/（m×m） 10×20 覆盖次数 192 道距/m 20 激发点距/m 40 激发线距/m 160 最大炮检距/m 3180 接收线距/m 160 最小炮检距/m 10 束间滚动距/m 160 最大最小炮检距/m 205 横纵比 0.75 最大非纵距/m 1900 主要目的层（T2）横纵比 0.95 道密度/（道/km2） 312.5 炮道密度/（万道/km2） 96 炮密度/（炮/km2） 156 时间采样间隔/ms 1 记录长度/s 6 
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