--> Abstract: Fractures Detection and Characterization for the Jurassic Carbonate Reservoirs Using 3-D P-Wave Pre-Stack Seismic Data in Saudi Arabia, by Abdulfattah A. Al-Dajani; #90077 (2008)
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Fractures Detection and Characterization for the Jurassic Carbonate Reservoirs Using 3-D P-Wave Pre-Stack Previous HitSeismicNext Hit Data in Saudi Arabia

Abdulfattah A. Al-Dajani
Saudi Aramco
[email protected]

Pressure well data have indicated a communication between two hydrocarbon-producing Jurassic Carbonate reservoirs: Arab D and Hanifa, in an oil field in eastern Saudi Arabia. Detecting and characterizing the existing fracture system(s) in our area-of-interest (AOI) using 3-D P-wave pre-stack Previous HitseismicNext Hit data is the main objective of this azimuthal Previous HitanisotropyNext Hit study. A relatively wide-azimuth full-offset 3-D P-wave Previous HitseismicNext Hit survey has been acquired over the oil field. The 3-D pre-stack P-wave Previous HitseismicNext Hit data has been analyzed to investigate the azimuthal variations of the normal-move-out (NMO) velocities and amplitude-variation-with-offset-and-azimuth (AVOA) as they pertain to the presence of fractures in the Arab D and Hanifa reservoirs in addition to upper Fadhili reservoir. The azimuthal pre-stack Previous HitseismicNext Hit Previous HitanisotropyNext Hit analysis for the target reservoirs suggests the existence of two dominant orthogonal Previous HitanisotropyNext Hit (i.e. fractures) orientations trending in general NE (c. 50–70o from N) and SE (c. 140–160o from N). AVOA Previous HitanisotropyNext Hit also suggests that the NE-trending Previous HitanisotropyNext Hit (c. 65–70o from N) is the most dominant fractures orientation at the reservoirs levels, which is consistent with the results obtained from borehole image logs. The NMO velocity and AVOA ellipticity maps provided insights about the fractures net-work and their intensities, offering a tool to assist in optimizing well planning and reservoir development. These conclusions are consistent with pressure data. Further enhancements can still be achieved by optimizing our data acquisition and processing techniques. This is the first successful published application of 3-D P-wave pre-stack Previous HitseismicTop azimuthal anisot-ropy analysis for fracture detection and characterization in a carbonate reservoirs in Saudi Aramco.

 

AAPG Search and Discovery Article #90077©2008 GEO 2008 Middle East Conference and Exhibition, Manama, Bahrain