APPLICATION OF 90°-PHASE SEISMIC DATA IN PREDICTION OF SANDSTONE
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摘要: 以黄河口凹陷西洼沙河街二段为例，对研究区地震剖面进行90°相位转换，根据转换后的剖面岩性特征及地质背景概况建立地质模型，进行正演模拟分析；然后对比零相位与90°相位的正演合成记录，校准地质模型，并依据地震剖面振幅属性特征，对相位转换后的地震剖面进行属性提取，预测砂体的展布。研究发现，基于90°相位转换地震剖面建立的地质模型更具直观性，正演合成记录验证砂岩恰好对应于波谷，波形能清晰地展示出砂岩层的纵向轮廓，并且90°相位转换的地震波谷振幅值属性平面图能清晰显示出砂体的平面展布及分布范围。Abstract: Taking the 2nd Member of Shahejie Formation in the Yellow River Mouth sag as an example, geological models were built depending on the 90° phasing of seismic data and the geologic setting. The modeling synthesis records from 0°-phase to 90°-phase were used to make the geological models more precise. Then according to the attributive character obtained from the 90°-phase of seismic data, seismic attributions extraction and formation slices could be used to predict the distribution of the sandstone. The results indicate that the geological models can be directly perceived through the 90°-phase seismic data, and at the same time the trough of waves can not only correspond to the sand body but also show the outline of the sand belt which is spreading in the seismic modeling synthesis of 90°phasing. What's more, the ichnography from the seismic attribution extraction about the character of trough amplitude can clearly show the contour profiles and boundaries of the sandstone.
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Key words:
- seismic sedimentology /
- sandstone distribution /
- 90°-phasing /
- geological model /
- seismic modeling
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图 1 地震剖面与测井对比图
Figure 1. The comparison and relation between seismic data and well data
图 2 砂泥岩波阻抗与自然伽马交会图
Figure 2. Cross plot of sandstone and mudstone between impedance and natural Gamma
图 3 砂泥岩层单层厚度统计及单井砂泥岩组合分布
Figure 3. Statistics of sandstone and mudstone thickness distribution frequency and the lithologic distribution characters of a drilling well
图 4 基于90°相位转换地震剖面建立地质模型
Figure 4. The geological model based on 90° phase of seismic data
图 6 原始地震剖面与正演合成地震剖面对比
Figure 6. Comparison between primitive seismic section and seismic modeling synthesis section of 90° phasing
图 7 属性切片与地震剖面相结合预测砂体展布
Figure 7. Combine the attribution slice and the seismic section to predict the sandbody's distribution
表 1 钻井不同岩性速度、密度、波阻抗及单层厚度统计
Table 1. Statistics of velocity, density, impedance and single thickness of different lithologics in a drilling well
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