Seismic.hpp File Reference

#include "gstlearn_export.hpp"

Functions
GSTLEARN_EXPORT int	seismic_estimate_XZ (DbGrid *db, Model *model, int nbench, int nv2max, int flag_ks, int flag_std, int flag_sort, int flag_stat)
GSTLEARN_EXPORT int	seismic_simulate_XZ (DbGrid *db, Model *model, int nbench, int nv2max, int nbsimu, int seed, int flag_ks, int flag_sort, int flag_stat)
GSTLEARN_EXPORT int	seismic_z2t_grid (int verbose, DbGrid *db_z, int iatt_v, int *nx, double *x0, double *dx)
GSTLEARN_EXPORT int	seismic_t2z_grid (int verbose, DbGrid *db_t, int iatt_v, int *nx, double *x0, double *dx)
GSTLEARN_EXPORT int	seismic_z2t_convert (DbGrid *db_z, int iatt_v, DbGrid *db_t)
GSTLEARN_EXPORT int	seismic_t2z_convert (DbGrid *db_t, int iatt_v, DbGrid *db_z)
GSTLEARN_EXPORT int	seismic_operate (DbGrid *db, int oper)
GSTLEARN_EXPORT int	seismic_convolve (DbGrid *db, int flag_operate, int flag_contrast, int type, int ntw, int option, int tindex, double fpeak, double period, double amplitude, double distort, double val_before, double val_middle, double val_after, double *wavelet)

Function Documentation

seismic_convolve()

GSTLEARN_EXPORT int seismic_convolve	(	DbGrid *	db,
		int	flag_operate,
		int	flag_contrast,
		int	type,
		int	ntw,
		int	option,
		int	tindex,
		double	fpeak,
		double	period,
		double	amplitude,
		double	distort,
		double	val_before,
		double	val_middle,
		double	val_after,
		double *	wavelet
	)

Convolve with a given wavelet

Returns

Array containing the discretized wavelet, allocated here

Parameters

[in]	db	Db structure
[in]	flag_operate	1 to perform the convolution; 0 otherwise
[in]	flag_contrast	1 to perform contrast; 0 otherwise
[in]	type	Type of the wavelet (ENUM_WAVELETS)
[in]	ntw	half-length of the wavelet excluding center (samples)
[in]	option	option used to perform the convolution -1 : erode the edge (on ntw pixels) 0 : truncate the wavelet on the edge +1 : extend the trace with padding before convolution +2 : extend the trace with the last informed values
[in]	tindex	time index to locate the spike (Spike)
[in]	fpeak	peak frequency of the Ricker wavelet
[in]	period	wavelet period (s) (Ricker)
[in]	amplitude	wavelet amplitude (Ricker)
[in]	distort	wavelet distortion factor (Ricker)
[in]	val_before	Replacement value for undefined element before first defined sample
[in]	val_middle	Replacement value for undefined element between defined samples
[in]	val_after	Replacement value for undefined element after last defined sample
[in]	wavelet	Wavelet defined as input (Dimension: 2*ntw+1)

seismic_estimate_XZ()

GSTLEARN_EXPORT int seismic_estimate_XZ	(	DbGrid *	db,
		Model *	model,
		int	nbench,
		int	nv2max,
		int	flag_ks,
		int	flag_std,
		int	flag_sort,
		int	flag_stat
	)

Perform a bivariate estimation on a grid

Returns

Error return code

Parameters

[in,out]	db	Grid Db structure
[in]	model	Model structure
[in]	nbench	Vertical Radius of the neighborhood (center excluded)
[in]	nv2max	Maximum number of traces of second variable on each side of the target trace
[in]	flag_ks	1 for a Simple Kriging; otherwise Ordinary Kriging
[in]	flag_std	1 for the calculation of the St. Dev.
[in]	flag_sort	1 if the traces to be treated are sorted by increasing distance to trace where first variable is defined
[in]	flag_stat	1 for producing final statistics

seismic_operate()

GSTLEARN_EXPORT int seismic_operate	(	DbGrid *	db,
		int	oper
	)

Do unary arithmetic operation on traces

Returns

Error return code

Parameters

[in]	db	Db structure
[in]	oper	Operator flag (ENUM_SEISMICS)

Remarks

Operations inv, slog and slog10 are "punctuated", meaning that if,

the input contains 0 values, 0 values are returned.

seismic_simulate_XZ()

GSTLEARN_EXPORT int seismic_simulate_XZ	(	DbGrid *	db,
		Model *	model,
		int	nbench,
		int	nv2max,
		int	nbsimu,
		int	seed,
		int	flag_ks,
		int	flag_sort,
		int	flag_stat
	)

Perform a bivariate cosimulation on a grid

Returns

Error return code

Parameters

[in,out]	db	Grid Db structure
[in]	model	Model structure
[in]	nbench	Vertical Radius of the neighborhood (center excluded)
[in]	nv2max	Maximum number of traces of second variable on each side of the target trace
[in]	nbsimu	Number of simulations
[in]	seed	Seed for the random number generator
[in]	flag_ks	1 for a Simple Kriging; otherwise Ordinary Kriging
[in]	flag_sort	1 if the traces to be treated are sorted by increasing distance to trace where first variable is defined
[in]	flag_stat	1 for producing final statistics

seismic_t2z_convert()

GSTLEARN_EXPORT int seismic_t2z_convert	(	DbGrid *	db_t,
		int	iatt_v,
		DbGrid *	db_z
	)

Resample from time to depth

Returns

Error return code

Parameters

[in]	db_t	Time Grid structure
[in]	iatt_v	Address of the Velocity variable (in Time grid)
[out]	db_z	Depth Grid structure

Remarks

Linear interpolation and constant extrapolation is used to

determine interval velocities at times not specified.

seismic_t2z_grid()

GSTLEARN_EXPORT int seismic_t2z_grid	(	int	verbose,
		DbGrid *	db_t,
		int	iatt_v,
		int *	nx,
		double *	x0,
		double *	dx
	)

Define the Depth Grid characteristics from the Time Grid

Returns

Error return code

Parameters

[in]	verbose	Verbose flag
[in]	db_t	Time Grid structure
[in]	iatt_v	Attribute address of the Velocity (in Time grid)
[out]	nx	Number of grid nodes along each direction
[out]	x0	Origin of the grid along each direction
[out]	dx	Mesh of the grid along each direction

seismic_z2t_convert()

GSTLEARN_EXPORT int seismic_z2t_convert	(	DbGrid *	db_z,
		int	iatt_v,
		DbGrid *	db_t
	)

Resample from depth to time

Returns

Error return code

Parameters

[in]	db_z	Depth Grid structure
[in]	iatt_v	Address of the Velocity variable (in Depth grid)
[out]	db_t	Time Grid structure

Remarks

Linear interpolation and constant extrapolation is used to

determine interval velocities at times not specified.

seismic_z2t_grid()

GSTLEARN_EXPORT int seismic_z2t_grid	(	int	verbose,
		DbGrid *	db_z,
		int	iatt_v,
		int *	nx,
		double *	x0,
		double *	dx
	)

Define the Time Grid characteristics from the Depth Grid

Returns

Error return code

Parameters

[in]	verbose	Verbose flag
[in]	db_z	Depth Grid structure
[in]	iatt_v	Attribute address of the Velocity (int Depth Grid)
[out]	nx	Number of grid nodes along each direction
[out]	x0	Origin of the grid along each direction
[out]	dx	Mesh of the grid along each direction