TTI/HTI Anisotropy for Fracture/Faults Image inside Granite Basement

The oil-bearing, fractured granite basement rocks are a very important and complicated hydrocarbon reservoir in offshore<br>Vietnam. However, the poor S/N ratio and imaging of these steeply dipping fractures by conventional Kirchhoff migration are<br>quite difficult to interpret for exploration. The recent development of Controlled Beam Migration (CBM) has generated a<br>much clearer fracture image inside the basement, but the velocity inside the basement remains an issue. The imaging velocity<br>field needs to be much slower than the well sonic velocity to produce a decent fracture image.