Publications

Sanga Sanga Block is a mature field that has been producing more than 50 years. In 2018, the operatorship has been awarded to PT. PERTAMINA together with 4 exploration wells as firm commitment for the next three years. Geologically, the proven fields in the Sanga Sanga area is a combination of both structural and stratigraphic traps. The study area was deposited in a deltaic environment which is prolific for its petroleum system elements such as reservoir, seal, and source rocks. The exploration objectives are clearly to prove the resources portfolio into reserve and sustain hydrocarbon production in the Sanga Sanga block. Hybrid methods, both Surface Geochemical and CWT Gamp, are constructed to identify and predict the presence of hydrocarbon accumulation. Surface Geochemical uses a direct (Acid Extracting Soil Gas & Fluoresence Analysis) and an indirect (Microbial Technique) method. The combination of both direct and indirect methods shows that signs of anomaly occurred in areas that are geologically potential for exploration by using a minimum threshold value based on analogues from dry exploration wells. The correlation of low anomaly with dry wells is nearly 90%. CWT Gamp is a transformation method of seismic attribute frequency by comparing low frequency anomalies as Direct Hydrocarbon Indicators in seismic data. This method has been applied to 3D and 2D seismic lines and resulted a good (60% – 70%) hydrocarbon correlation (DHI) at frequencies between 12-25 Hz. Combination of those methods provides a positive sign for the position of exploration wells in Sanga Sanga area and clearly boosts the confidence of the placement of exploration well, especially in delta prone areas which are very high in structural and stratigraphic trap systems.