地震沉积学在滨5断块的应用研究

The Application of Seismic Sedimentology in Fault Block Bin 5

地震沉积学是继地震地层学、层序地层学之后出现的一门新的边缘交叉学科。重点讨论了利用地震沉积学方法提高研究区(滨5断块)储层横向预测精度等问题。通过时频分析技术,根据研究区的地层特性进行合理的层序划分,并通过井震标定建立了最小研究单元的等时地层格架。通过岩相物理学研究认为,研究区沙三下亚段4、5砂组砂岩表现为高阻抗特征,在地震剖面上表现特征为中强振幅反射特征,因此可以选择能量类的属性来表征目的层岩相。该次研究采用回剥技术,利用孔隙度和深度关系来恢复原始地貌,在古地貌的控制下,选择弧长属性进行沉积相的分析,沉积相研究成果与地震属性特征符合,说明利用弧长属性进行沉积相分析具有较强的合理性和可靠性。

The seismic sedimentology was a new cross discipline after the seismic stratigraphy and sequence stratigraphy.The application of seismic sedimentology to enhance the cross accuracy was emphatically discussed,by using the time-frequency analysis,and formation characteristics in the studied area,the sequence was rationally classified,and the isochronic formation frame was established the smallest unit.After the research of the facieology,the sand rock of the forth and fifth lower members of the Shahejie Formation was high impedance,and the characteristics of the seismic cross section was moderate amplitude reflectance,the energy attribute was chosen to characterize the lithofacies of the target formation.In this research,the back stripping technique and the relationship of the porosity and depth are used to restore the original physiognomy,and under the control of the original physiognomy,the arc length is chosen to analyze the sedimentary facies,the result of the analysis of the sedimentary facie is consistent with that of seismic attribute characteristics,it shows that the arc length to analyze the sedimentary facies is appropriate and reliable.