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研究区碳酸盐岩孔洞型储集层具有明显的地震响应特点,在地震剖面上表现为“串珠状”反射,在地震属性平面图上呈星状或团块状。通过对含油气储集层岩石地球物理分析,含油气孔洞具有低伽马、低波速的特点。采用由伽马曲线重构纵波速度曲线,由原声波时差曲线利用加德纳公式计算密度,以此得到拟声波阻抗,进而由拟声波阻抗反演来识别孔洞的含油气性。这种方法能够很好地突出含油气孔洞的特点,与属性分析技术结合能够更加准确地得到含油气储集层的分布,在研究区碳酸盐岩含油气孔洞型储集层的预测中取得了一定的应用效果。
Carbonate pore-type reservoirs in the study area have obvious characteristics of seismic response, which are characterized by “beaded” reflection on the seismic profile and star-shaped or mass-like on the seismic attribute plan. By analyzing the geophysics of oil and gas reservoirs, the oil and gas vugs have low gamma and low wave velocity. By using Gamma curve to reconstruct the P wave velocity curve, the Gardner formula is used to calculate the density from the acoustic wave time difference curve to obtain the pseudo-acoustic impedance, and then the pseudo-acoustic impedance inversion can be used to identify the oil and gas in the hole. This method can well highlight the characteristics of oil and gas vugs, and in combination with attribute analysis techniques, the distribution of oil and gas reservoirs can be obtained more accurately. It is obtained from the prediction of carbonate-containing oil and gas vugs in the study area A certain effect of the application.