THE APPLICATION OF SPECTRAL DECOMPOSITION TECHNOLOGY TO THE LOWER CRETACEOUS RESERVOIRS PREDICTION IN EASTERN DEPRESSION OF THE NORTH YELLOW SEA
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摘要: 以北黄海东部坳陷某区块为研究对象,对下白垩统地层通过频谱分解技术进行储层预测和岩性圈闭。该区块是发育在斜坡上的扇三角洲相沉积,砂岩储层薄,地层横向变化大,利用常规的地震属性和地震波阻抗反演难以圈闭有利的储集区域。针对研究区储集层的特点,利用连续小波变换方法,生成调谐体和离散频率能量体,结合地震属性和水平切片技术,实现在频率域进行砂体描述和储层横向变化规律的研究。其预测结果与实际钻井资料吻合得较好,圈定了砂体的分布范围和物源方向,为研究区下一步井位部署提供了依据,也为研究区利用频谱分解方法进行储层预测提供了新的技术方法和手段。Abstract: A block in the eastern depression of the north Yellow Sea is selected as the case for application of spectral decomposition techniques to the prediction of lower Cretaceous reservoirs and lithologic traps. The block is developed on the slope of a fan-delta facies. The sandstone reservoirs are thin in thickness and changing greatly in lateral direction. It is difficult to find favorable reservoir traps by conventional seismic attributes and seismic impedance inversion. According to the characteristic of reservoirs in this area, we used the continuous wavelet transform(CWT) method for generating tuning volume and discrete frequency energy volume. Combined with seismic attribute and horizontal slice technology, we made sandbody description and the study of reservoirs lateral variation. The prediction was fit with the actual drilling data, and could be used to delineate the distribution of sandbodies and their sources.
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Key words:
- Eastern Depression /
- Spectral Decomposition /
- Lower Cretaceous /
- Reservoirs /
- The North Yellow Sea
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