利用地震信息研究沉积体系平面分布特征——以鄂尔多斯盆地延长探区高家河三维区盒八段为例

发布时间：2018-12-06 14:47

【摘要】：以鄂尔多斯盆地延长探区高家河三维区二叠系下石盒子组盒八段为例,阐明了利用地震信息研究沉积体系平面分布特征的方法。研究表明,岩石物性是地震资料进行沉积学解释的基础。基于90°相位地震数据体,利用时频分析技术,分析砂层地震反射频率;结合地震滤波,压制砂层地震干涉作用。地质、测井及地震相结合,对不同主频的地层切片进行沉积学解释,该方法有助于提高预测沉积体系的精度。研究区三角洲前缘亚相是盒八段的主要沉积亚相,其主要沉积微相为具有较大规模的2条分流河道。一条水下分流河道呈南东—北西向,沿S228、S232、S204、S205、Yq2和S216井展布;另一条分流水道近东西向,沿Y218、S222、Y120和S226井分布。这些水下分流水道充填砂体自然伽马曲线呈钟形、齿状钟形或箱形,在地层切片上表现为中、强能量带状反射模式。此外,一较小规模水下分流河道见于研究区西缘S212、Y217、S211、S210、S246及S247井区,在地层切片上表现为中弱能量蠕虫状、小斑块地震反射模式。
[Abstract]:Taking the eighth member of the Lower Shihezi formation of the Permian Lower Permian in the Gaojiahe Three-dimensional area of the Yanchang Exploration area of Ordos Basin as an example, the method of using seismic information to study the plane distribution characteristics of the sedimentary system is expounded. The results show that the petrophysical properties are the basis of sedimentary interpretation of seismic data. Based on 90 掳phase seismic data volume, the seismic reflection frequency of sand bed is analyzed by time-frequency analysis technique, and the seismic interference of sand bed is suppressed by combining seismic filtering. The sedimentary interpretation of stratigraphic slices with different main frequencies is carried out by combining geology, logging and earthquake. This method is helpful to improve the accuracy of prediction of sedimentary system. The delta front subfacies in the study area are the main sedimentary subfacies of Boba formation, and the main sedimentary microfacies are two distributary channels with large scale. An underwater distributary channel distributes along S228S232S232S204FU S205U Yq2 and S216, and the other distributes channel near east-west direction, distributing along Y218S222Y120 and S226 wells. The natural gamma-ray curves of these subaqueous distributary waterways filled with sand bodies are bell-shaped, toothed or box-shaped, and in stratigraphic sections they are characterized by medium and strong energy band reflectance patterns. In addition, a small scale underwater distributary channel is found in the S212OY217S211S210S246 and S247 well areas on the western edge of the study area.
【作者单位】：西安石油大学;中国石油长庆油田分公司第二采气厂;
【基金】：国家自然科学基金项目(41372118) 陕西省科技计划项目(2014K10-12)资助
【分类号】：P631.4

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