1D Forward Modeling (1DFM^®)

	Velocity Changes Density Modeling	Velocity Changes Fluid Workshop

Understanding how the geology affects the seismic world is an important part of the interpreter’s challenge. Geoscientists can use 1D Forward Modeling to model lithologic and reservoir fluid properties to see the effect on seismic traces and pre-stack gathers.

Using 1D Forward Modeling, geoscientists can interactively model seismic data by changing the geological conditions and parameters that control seismic responses. This provides a comparison of real and synthetic seismic data to make geological inferences from the observed data. The model can be iteratively changed to match real seismic data accurately.

Benefits

• Enhanced ability to tie geology to the seismic
  
• Iterate through multiple geologic and reservoir fluid models to better understand the stack and pre-stack data
  
• Easily generate pseudo wells for input into 2D forward modeling capabilities
  
• Gain better understanding of AVO responses in stack and pre-stack data

Modeling

• Zone based modeling of P and S Velocity curves and Density curves
• Poisson ratio based modeling
• Calculate and model porosities
• Definition of Rock Matrix coupled with hydrocarbon/water ratio
• Interval-based copy, cut and paste of log data
• Fluid substitution workshop based on Gassman’s equations
• Modeling of interval thicknesses

Log Curves

• Uses standard P and S wave sonics, and density curves
• Converts sonic and density logs using standard industry routines
• Generate Shear wave logs using cross-plotting, mud rock trends, or Vp/Vs ratio

Results

• Synthetic seismogram - 0 offset normal incidence trace
• Synthetic gather
• Stacked synthetic generated from synthetic gather traces
• Save as pseudo wells
• Export as SEG Y or Text files