Near Surface Facies Based Global Constrained Near Surface Modeling

Topographical and geological conditions variations cause serious static and imaging problems<br>to the seismic data processing of the contract area, Block B, West Rub’ Al-Khali Basin.<br>Although fairly good result was obtained with continuously effort for Near Surface Model<br>(NSM) updating during the 2D and 3D seismic data processing, limited static correction<br>accuracy was showed and possible static problems were also observed during later on data<br>processing and interpretation.<br>Bunches of near surface modeling methodologies can be adopted for near surface modeling<br>and each one has its advantages and limitations in terms of adaptability and accuracy. Sorts of<br>geosciences data are also available in the working area, Block B. By dedicated research and<br>analysis all possible methodologies and geosciences data, a new term Near Surface Facies<br>(NSF) was introduced and a new approach called Global Constrained Near Surface Modeling<br>(GCNSM) was developed for the NSM building based on the NSF analysis. Comparing with<br>the old NSM, the new model showed better accuracy and more reliable result.