分频解释技术在刻画河道砂体中的应用——以苏乃诺尔地区为例

 为研究区内疏网井区沉积相划分,分析沉积环境,本文采用分频解释技术对区块进行处理分析.分频解释技术采用离散傅里叶变换将地震数据由时间域转换到频率域,在频率域观察砂岩横向不连续性,从而对河道砂体进行横向预测.基于分频解释技术原理,以苏乃诺尔研究区大二段高位体系域晚期地层为例,对河道砂体进行刻画.相较于传统的地震属性,分频属性对识别河道砂体边界特征、平面展布形态、横向不连续性等有良好的作用,对疏井区沉积相划分有较好的指导作用.结果表明,苏乃诺尔大二段高水位体系域晚期地层主要发育网状河三角洲,在疏网井区发育网状分流河道特征,特征明显,克服了无井约束的问题.

Applications of Frequency Division Interpretation Technique in Depicting Channel Sand Body: Taking Area of Sue Nenol as Example

In order to study sedimentary facies partition of sparse well area, and analyze the sedimentary environment, frequency division interpretation technology is used for processing analysis, the purpose is to solve the above problems. Frequency division interpretation technique converts seismic data from time domain into the frequency domain using the discrete Fourier transform method in order to observe sandstone transverse discontinuity, which plays a role of lateral prediction. Based on the principle of frequency division interpretation technique, it depicts the channel sand body in the HST of the second section of Damoguaihe late formation in Sue Nenol. Comparing with conventional seismic attributes, frequency division has a good response to identify channel sand body boundary, plane distribution morphology, and lateral discontinuity. It is a better guide for the classification of sedimentary facies on sparse well area. Finally, the conclusion is that the HST of the second section of Damoguaihe late formation in Sue Nenol mainly developed in Anastomosing River Delta. In sparse well area, it developed the features of distributary channels, characteristic is very clear and it overcomes the problem of non-well constraint.