need help. how to do regional velocity analysis?

[ahmedsisy]

thanks

[zhuhuan]

i just noticed what you wrote ... you have only 2 wells in one structure ? no faults and the problem is only diiference in average velocity between the 2 wells ??? is this the case ?
if so .... it's not regional ... and V=V0+KZ will not be useful
if this is the case you need to apply synthetic , compare sonic logs and checkshots of both , check also the stacking velocity if available (not always works) .... determine the anomalous layer from sonic log , check it on seismic sections , check it's effict on Vav and Vint, generate synthetic seismogram ... try to change the thickness of anomalous layer using the wedge model module (you can find in hampson russel, then check this layer continuity and thickness variation in your area .... then use layer cake method to convert from time to depth any layer below the anomalous layer.
let me know if this is helpful or if you need any more details.

Sorry for replying late,my friends. have meeting all these days.After I read the two articles ,I think it can't be called regional velocity reseach. In my study area it have merely 20 wells drilled at present. And in the article it commonly have hundreds of wells.
In my study area we often encounter with the depth conversion question.In a structure, we usually use the velocity of wildcat well to convert time to depth.But on appraisal well ,the actual depth are higher or lower. sometimes the depth in appraisal well were higher than the wildcat.You know we commonly drill wildcat well in the top of the structure.
Your suggestion are very good. I will have a try.Thanks my friend.
And sorry for my poor english expression about "regional velocity".

[gustavohd]

If you have sufficient wells with sonic logs you could try to tabulate the DT reading at reservoir marked depth. Do this for all wells. You must know x,y coordinates for all wells involved. The inverse of the DT reading is a measure of seismic velocity. Now you have seismic velocity data distributed at all well locations. For the map you can use any contour software like SURFER.

[SLB]

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