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地震波振幅变化最明显的是“亮点”。它可以用来直接指示油气的存在。本一文将详细地描述在加拿大阿尔伯特中部一个埋藏较浅的下白垩系地层中成功地应用波形分析指示天然气的例子。在约2,000英尺的深处,科隆层主要是由薄的(10英尺)冲积砂岩和页岩的互层组成。在1976年,赫德森湾油气公司(H.B.O.G.)研究了这个地层中的一组100英尺厚的河道砂岩(产气层)。根据地质解释,几次试图扩展河道带,都失败了。因此,又用了地震方法,几条穿过河道的地震测线在科隆层部位均有“亮点”显示。到目前为止,根据地震波形分析结果打了86口井,其中67口见到工业气流,成功率78％。用地球物理资料对科隆层计算的总储量为1,100亿立方英尺(30亿立方米)。
The most obvious change in the amplitude of a seismic wave is the “bright spot.” It can be used to indicate the presence of hydrocarbons directly. This article will describe in detail the successful application of waveform analysis to indicate natural gas in a shallow buried Lower Cretaceous formation in central Alberta, Canada. At about 2,000 feet deep, the cologne layer consists mainly of thin (10-foot) alluvial and shale interbed. In 1976, H.B.O.G. of Hudson Bay studied a group of 100-foot channel sandstones (gas beds) in this formation. According to the geological interpretation, several attempts to expand the river channel failed. Therefore, again using the seismic method, a few of the seismic lines crossing the river have a “bright spot” on the Cologne floor. To date, 86 wells were drilled based on seismic waveform analysis, of which 67 saw industrial airflow with a success rate of 78%. The total reserves calculated on geocell data using geophysical data are 110 billion cubic feet (3 billion cubic meters).