Publications

Petrophysical analysis plays an important role in a reservoir study to understand the rock and fluid types in reservoir. Gas while drilling can be used to determine the fluid type in reservoir. Furthermore, the two analyses are combined for more confident targeting hydrocarbon reservoir. The study area is focused on Baturaja Formation, South Sumatera Basin (SSB), which comprises carbonate rocks. In this study area, Baturaja Formation is not a target priority, thus the formation is never looked up before. However, the interval study has minimum core data. Data that is used in study area are wireline logging, gas while drilling, rate of penetration, core data and drill stem test (DST). Wireline logging is used for estimating reservoir properties and fluid type such as shale volume, porosity, and water saturation. Gas while drilling data is conducted for data input in Pixler plot ratio to know fluid type, nevertheless gas line value in Pixler plot ratio have to modified first for resulting a suitable result in study area. Rate of penetration indirectly can describe how porous the rocks, thus rate of penetration is used for porosity indicator. There is no core data in study area, therefore core data from other fields are used as an analogue to define petrophysical method and model applied to the area, after defining the similarity of field characteristic using cross plot sonic with gamma ray. There are several drill stem test data in interval study which can be used for validating water saturation model and gas while drilling analysis. The combination of those data can be used in formation evaluation which has a minimum core data. Especially Pixler plot ratio and rate of penetration can be used for supporting evaluation formation. The final result of this study is obtained hydrocarbon column distribution in Baturaja Formation.