Comparative Study ofthe Selected Basement Discoveries around the World with Special Emphasis to Anding Utara of Peninsular Malay Basin

A technical comparison of the selected basements discoveries have been made based on
geology, geochemistry, reservoir characteristics and production behavior of selected
basement reservoirs to find an analog to Anding Utara Field. Anding Utara, a fractured
basement discovery in the Peninsular Malay Basin could not be developed yet due to
inconsistent production testing results. Thus, Anding Utara has become an engineering
challenge to put it on production. Four basements discoveries, White Tiger field of
Vietnam, Zeit Bay field of Egypt, Jatibarang field of Indonesia and Y aerxia field of
China, have been compared of which the Yaerxia field is seen as similar behavior with
Anding Utara field. These two fields have same lithology (phyllite), nearly equal
reservoir pressure and also both have high wax content (exact value of Anding Utara is
not known). However, Anding Utara field has higher reservoir temperature (270 °F) and
higher GOR ( 4210 scf/stb) compared to the Y aerxia field but, the fracture density is
comparatively low. The Yaerxia field, with lower temperature (187 °F) and lower GOR
(350-584 scf/stb ), shows stable production for almost nine years because of its high
fracture density (39 counts/m). The Anding Utara on the contrary shows inconsistent
production even with high temperature and high GOR only because of low fracture
density (0.1-1 fractures/m). From the study, it confirms that the fracture distribution and
connectivity plays an important role in hydrocarbon production from the basement
reservoirs. Artificial fracturing by hydraulic fracturing and matrix acidizing to increase
the permeability, and horizontal wells to connect extensive vertical fractures are
suggested here as a possible engineering solutions for the Anding Utara to put it back on
production.