摘要
摘要：高精度三维地震勘探技术在提高数据采集密度的同时，可以有效提高地震信号的信噪比及纵横向分辨率，为解决复杂地区的精细构造解释及煤矿瓦斯预测奠定良好的数据基础。在淮南某煤矿采用了5mX5m小面元、64次覆盖、纵横比为0.8的高精度三维地震采集技术，及叠前去噪、保持振幅、提高分辨率、叠前时间偏移等处理技术，获得了高质量的地震剖面。在解释工作中，将方差、曲率等属性进行综合分析，有效提高了解释的准确性。该研究区的高精度三维地震勘探实例表明，沿煤层的方差体切片，可以有效识别断距2-5m的断层；方差属性和曲率属性能够清晰显示20m左右的小陷落柱，且不受附近大陷落柱等地质体的影响；而利用叠前道集数据得到的煤层泊松比与煤层气呈负相关关系，即低泊松比区为煤层气（瓦斯）的相对富集区，并与断层关系密切。
At the same time to increase data acquisition density, the high precision 3D seismic prospecting technology can effectively improve seismic signal S/N ratio and longitudinal and lateral resolution, thus settled a good foundation to solve refined structure inter- pretation and coalmine gas prediction in complicated areas. In a Huainan coalmine using techniques of 5mx5m small surface element, 64 folds, aspect ratio 0.8 high precision 3D seismic acquisition technology, prestack denoising, amplitude holding, resolution improving and prestack time migration etc. obtained high quality seismic section. During interpretation, carried out comprehensive analysis of variance, curvature attributes, effectively improved interpretation accuracy. The prospecting cases in the study area have shown that coal bedding variance cube slice can effectively identify faults with displacement 2-5m; variance and curvature attributes can clearly display small subsided column with diameter about 20m, in addition, unaffected by nearby large subsided column and other geological bodies; while using prestack trace gather data obtained coal seam Poisson＇ s ratio and CBM presents negative correlation, i.e. in low Poisson＇ s ratio area is relative enrichment zone of CBM （gas）, and closely related with faults.
出处
《中国煤炭地质》
2014年第2期60-64,共5页
Coal Geology of China
关键词
高精度三维地震技术
方差属性
曲率属性
泊松比
断层
陷落柱
煤层气(瓦斯)
high precision 3D seismic prospecting technology
variance attribute
curvature attribute
Poisson＇ s ratio
fault
subsidedcolumn
CBM （gas）
