You can do the calculation using GMT software if you have a grid that represents the thickness of the sedimentary layer and know what the average density is.

2*pi*G*delta_rho*1e5*layer_thickness (value in mGal). You would need to upward continue this result by the mean depth of the layer. Delta_rho = sediment_density - reference_density

It is important to work on the Bouguer anomaly data for this.

Sediment-corrected_Bouguer=Bouguer_anomaly - layer_gravity signal

The tricky thing is getting a reliable thickness grid. Hope that gives you some pointers.

hi,

You can use from Bouguer correction  in order to  gravity effect elimination of Bouguer slab from observed gravity. The Bouguer slab height  is equal with gravity reading station height. You should note that the Bouguer slab include sediments,  sedimentary rock,  Igneous rock, Metamorphic rock, etcetera, not only sediment.

After computing the  Bouguer correction (according to Lester Anderson) for every measurement points, the Bouguer anomaly is obtained.   Afterward must do the  topography (Terrain) correction.

Good luck

http://web.ics.purdue.edu/~ecalais/teaching/eas450/Gravity4.pdf

I assume you already have the complete Bouguer anomaly (including the terrane correction). Then  you need a control on the depth and thickness of this layer, in order to calculate the respective gravity effect and to rest it from the Bouguer anomaly. This procedure is referred to as stripping. In the following paper is an example of the stripping technique.

Best regards,

Oscar Campos

Campos-Enriquez, J.O., Hubral, P., Wenzel, F., Lueschen, E. and Meier, L., 1992, Gravity and magnetic constraints on deep and intermediate crustal structure and evolution model for the Rhine Graben, Tectonophysics, Vol. 206, p. 113-135.

if you know depth sedimentary layer, you run forward program 3D with constrat density sediment, but if you don't known depth sedimentary layer it is difficult, you can use upward continue or filter frequence

Simply by separation of the Bouguer gravity field into Regional and Residual fields. The residual field represents the sedimentary section. There are several techniques of separations