Limited off-set consideration in de-multiple process of seismic Lake Towuti

International Conference on Geoscience

Andika, Ryan Bobby^1 ; Triyoso, Wahyu^1 ; Bijaksana, Satria^1 ; Hafidz, Abd.^1 ; Russell, James M.^2 ; Watruss, Nigel^3 ; Vogel, Hendrik^4

Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung

40132, Indonesia^1

Department of Earth, Environmental and Planetary Sciences, Brown University, 324 Brook St., Providence

RI

02912, United States^2

Large Lakes Observatory, University of Minnesota Duluth, Duluth

MN

55812, United States^3

Institute of Geological Science, Oeschger Center for Climate Change Research, University of Bern, Baltzerstrasse 1+3, Bern

3012, Switzerland^4

关键词: Combination method;    Common reflection surfaces;    Multiple attenuation;    Predictive deconvolution;    Seismic processing;    Seismic recording;    Subsurface images;    Surface-related multiple elimination;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/279/1/012033/pdf
DOI  :  10.1088/1755-1315/279/1/012033

来源: IOP

【 摘 要 】

Multiple attenuation effect study in Lake Towuti seismic data is based on limited offset recording. The goal of this study is to better understand the sediments structure of Lake Towuti that layered above East Sulawesi ophiolitic and metamorphic rocks for stratigraphic interpretation. Surface-related multiple and internal multiple are a common noise signal that recorded in this seismic data, alongside the primary signal from the sediments layer. In order to get a representative subsurface image of the lake, a combination of some de-multiple method to suppress this noise signal has been applied in previous study. However, the line seismic that used in this seismic recording is less than 100 m. From our perspective, this limited offset line fact have to be considered carefully. It's because some application of de-multiple method in this case will not effectively suppress the noise. In this study, we give an alternative combination method in function to put out the surface-related multiple of the case. First, we enhance the S/N ratio and velocity analysis of the data by Common Reflection Surface (CRS) method. From this enhancement, CRS can give a direct advantage when applying some de-multiple method, especially in Predictive Deconvolution and SRME method. Moreover, we combine the application of de-multiple theory with the strict arrangement of Predictive Deconvolution, Surface-Related Multiple Elimination (SRME), and the last is F-K filter. Those combination methods precisely give a better imaging of Lake Towuti sediments layer in this seismic processing study.