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Velit/VelPAK Optimise

Velit employs Dr. Al-Chlabi's numerical optimisation to determine the best parameters for velocity functions from well, seismic velocity and apparent interval velocity. Both linear and non-linear functions are supported. This robust technique maximises the value of the data you have loaded into the model. Optimise uses non-linear curve fitting to derive the best function parameters for each well. For each pair of points on the time depth curve we compare the known depth of the base point (B) against the depth predicted by the function parameters. Given the known depth of point A (Zt), the V0 & K parameters we predict the depth at point B (Zb). For each possible V0,K pair we calculate an RMS residual. We then minimise this value using optimization techniques. This provides us with the best fit function. Optimisation can fix one value and then map the other. For example, the optimisation results for the function V = V0 + kZ could be used fix k to the optimal constant value for the layer and compute the corresponding V0 map, bringing spatial variation into the model. Using optimisation for parameters lends itself particularly well to stochastic simulation; the model parameters can be stochastically varied to measure the depth uncertainty following depth conversion. To model uplift there is a simple variation on the standard linear Vo+kZ velocity function. V = Vo + kZ - kpZb. The function is only appropriate if the base of the interval was flat at maximum depth of burial. If this condition is satisfied, then the difference in base depth between two wells provides a direct measure of the relative amount of uplift and the base of the interval may be used as a reference for the amount of uplift. The decompaction factor controls how the velocities vary with uplift. If the decompaction factor is zero, the uplift function reduces to a standard Vo+kZ function, which implies that the rock is perfectly elastic and retains no memory of its burial history. If the decompaction factor is 1, the rock does not decompact at all. In reality, the decompaction factor will lie somewhere between 0 and 1, but probably closer to 1 than to 0. https://www.equipoisesoftware.com/ #Velit #DepthConversion #VelocityModelling #petrel #TimeToDepth #VelPAK #shorts #short #shortvideo #shortsvideo #geosciences #geosciences #geoscientist #depthsofearth