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利用地震反射波的动力学信息,直接寻找砂岩油、气藏的研究成果,在国内外均有大量的报导。本文介绍在碳酸盐岩裂缝性气藏区用振幅比法直接找气的尝试和效果。实钻证明,获气量的大小与产气的碳酸盐岩层中的裂缝发育程度有密切的关系,而穿过发育程度不同的裂缝带的地震反射波,其振幅与频率特性将因吸收作用而发生变化,这就是用于直接找气的物理基础。为削弱与气藏特性无关的影响振幅的其它因素,因此采用“振幅比”与“人工合成记录”相结合的方法进行研究。本文简单介绍了“振幅比”及“人工合成记录”的具体方法,用所得结果与实钻获气资料进行统计归纳,找出产量与振幅比值之间的相关关系,进而预报正钻井或拟钻井的可能结果,符合度达60％以上,这使继续发展此方法具有现实的意义。文章也指出这方面的地质地球物理基础理论需要深入研究,以促进直接找气的方法快速发展。
Utilizing the dynamic information of seismic reflection wave to directly search for the research results of sandstone oil and gas reservoirs, there are a lot of reports both at home and abroad. This paper introduces the attempts and results of using the amplitude ratio method to find gas directly in carbonate fractured gas reservoirs. It is proved by actual drilling that the size of the obtained gas is closely related to the degree of fracture development in the carbonate rock layer of the gas production. However, the seismic reflection wave passing through the fractured zone with different degrees of development will have an amplitude and frequency characteristic due to absorption This is the physical basis for looking for gas directly. In order to weaken the other factors that affect the amplitudes unrelated to gas reservoir characteristics, the method of “amplitude ratio” and “synthetic record” are used to study. In this paper, the specific methods of “amplitude ratio” and “synthetic record” are briefly introduced. The obtained results are compared with the data of actual drilling gas acquisition to find out the correlation between the yield and amplitude ratio, and then predict whether the drilling or quasi-drilling The possible result, the degree of conformity amounts to above 60%, this makes realistic development to continue this method. The article also points out that the basic theory of geophysics in this area needs to be further studied in order to promote the rapid development of direct gas finding methods.