【摘要】 碳酸盐岩裸露区地震采集资料信噪比低,成像质量差,地质构造解释困难已成为制约海相碳酸盐岩油气勘探的技术瓶颈,因此,开展碳酸盐岩裸露区近地表地震波衰减特性研究对于揭示地震采集资料低品质的成因具有重要的现实意义。以镇巴探区800余口井的微测井解释成果为基础,采用李庆忠经验公式估算了近地表地层品质因子Q,进而分析了不同岩性出露区近地表衰减特性的差异性。结果表明,碳酸盐岩裸露区近地表地层平均品质因子明显低于砂岩、泥岩和砂泥岩互层出露区,显示出较强的地震波衰减特性,其可能是造成碳酸盐岩裸露区地震采集资料低品质的主要原因之一。更多还原

【Abstract】 In carbonate outcropped area,the seismic data is characterized by low signal-to-noise ratio,bad imaging and difficult in structure interpretation,which have become the technical bottlenecks restricting oil-gas exploration of marine facies carbonate reservoirs in China.Therfore,It has important and realistic significance to study the attenuation characteristics of seismic wave propagation in near surface layers of carbonate outcropped area for analyzing the cause of low-quality seismic data.Based on the explanation results of uphole data of more than 800 wells in Zhenba area,the quality factors of near surface layers were estimated by Li Qingzhong’s experience formula,and then the difference of attenuation characteristics of near surface layers for different lithology outcropped area were analyzed.As a consequent,the average quality factor of near surface layers in carbonate outcropped area is significantly lower than that in the outcropped area of sandstone,mudstone and the interbed,which displays stronger attenuation for seismic wave propagation and maybe one of the main causes for the low-quality seismic data in the carbonate outcropped area.更多还原