Publications

Commonly, static Fault Seal Analysis (FSA) utilize term SGR (Shale Gouge Ratio) as main modeling parameters for evaluating seal and non-seal fault plane. Based on actual definition of SGR, this number is calculating or estimate using sum of v-shale values from reservoir and non-reservoir which are involved in the faulting (slip along fault plane) multiply by each layer thickness and divided by throw. In general, lower SGR values meaning low v-shale values (good reservoir) are considered as leaky faults. On the other hand, large number of throw resulted in high probability of generating sealing faults even though with low v-shale composition. This due to large number of rocks mixing along fault plane resulted from large displacements slip vector along fault plane. In reality, this method actually only works for clastic reservoir rocks which heavily rely on v-shale values of sedimentary sequences. Carbonate rock sequences particularly reef facies can have very low v-shale values as result conducting FSA in carbonate rocks tends to have leakier faults rather than sealing one even in high throw cases. Our research concentrated in solves this problems using various modified petrophysical approach such as using probabilistic instead of deterministic approach. In addition, this study is also supported by result of FSA study using in the Rajamandala carbonate complex near city of Bandung. Results of study demonstrates that special petrophysical approach needs to apply in conducting FSA in the carbonate sequences particularly in reef complexes due of low to zero v-shale values in the rock sequences.