oa Vietnam Basement Fracture density determination using seismic acoustic impedance inversion

The basement plays in Vietnam and the recent domestic Peninsular Malaysia discovery of Anding-Utara’s basement potential provide the push to obtain basement fracture patterns from a more areally complete coverage such as the 3D seismic data coverage. Conventionally coherency type technologies have been applied in identifying faults and lineament in 3D seismic data. We have found that the acoustic impedance data from Far angle substack 3D seismic help to better focus faults and fracture imaging. The quality<br>control/check maps in the seismic inversion process seemed to provide clues toward the<br>presence of larger clusters of fractures within the basement zone. The observed localized areas of perceived higher fracture density is consistent<br>with the interpretation of expected denser fracture area from the conjugation of the<br>larger faults. The well located within the area of interest have tested fairly tight basement rock and this corresponded reasonably well with the perceived lower<br>fracture density areas of the quality check maps. Where available results of spectral decomposition of the same zone of interest are compared to enable us to arrive at a<br>consistent deduction of the occurrence of fracture intensity and their related trends.