--> Abstract: When Diagenesis Severely Modified Reservoir Characters: A Unique Carbonate Reservoir from Alur Siwah Field, Indonesia, by Ricardo, Maranu; Syarifuddin, Ismail Y.; Adhitiawan, Erham; Nurul, Nadia; Miftahurochman, Miftahurochman; Baskaraputra, Ferry F.; Luqman, Luqman; Yanto, Yudi; Lumban Tobing, Joan C.; #90163 (2013)
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When Diagenesis Severely Modified Reservoir Characters: A Unique Carbonate Reservoir Previous HitfromNext Hit Alur Siwah Field, Previous HitIndonesiaNext Hit

Ricardo, Maranu; Syarifuddin, Ismail Y.; Adhitiawan, Erham; Nurul, Nadia; Miftahurochman, Miftahurochman; Baskaraputra, Ferry F.; Luqman, Luqman; Yanto, Yudi; Lumban Tobing, Joan C.

Building geological model of Lower Miocene carbonate reservoir in South East Asia region frequently offers huge challenge in defining the depositional facies model and reservoir characterization. Dynamic depositional system combined with multiple sub-aerial exposures could give a certain degree of complication in reservoir properties, especially due to porosity modification and change in permeability transform. Bioclastic limestone with various degrees of reservoir quality are described Previous HitfromNext Hit core Previous HitdataNext Hit with high inconsistencies on porosity and permeability values along with depth on the same lithofacies. Multilayered porosity development was found in some wells and confirmed by well test Previous HitdataNext Hit that multiple sub-aerial exposure is more likely occurred instead of single sub-aerial exposure. Integration of core Previous HitdataNext Hit and petrophysical analysis in decoding this complexity into a more definite rock types has been a key process in building the input for distributing the properties Previous HitfromNext Hit cored section to un-cored section and eventually to areas between wells supported by Previous HitseismicNext Hit Previous HitdataNext Hit. A new reprocessed Previous Hit3-DNext Hit Previous HitseismicNext Hit dataset was used for Previous HitstructuralNext Hit and stratigraphic interpretation including multi-attribute analysis and Previous HitseismicNext Hit Previous HitinversionNext Hit (AI) for reservoir property prediction. Five zones of conventional interpretation have been generated, bounding internal Previous HitseismicNext Hit characters of transgressive, prograding and aggrading units which suggest different layering methods and probabilistic approaches have to be Previous HitappliedNext Hit for each different unit. Previous HitSeismicNext Hit Previous HitinversionNext Hit result shows high porosity correlate with low acoustic impedance and low porosity is the opposite. Highest cross correlation (0.7) is calculated between actual and predicted effective porosity logs in the study area. The final AI model provides geologically more realistic predicted effective porosity distribution and helps in understanding the subsurface image. Advanced probabilistic approaches were Previous HitappliedNext Hit on Previous Hit3-DNext Hit static model integrates the depositional facies, diagenesis process, petrophysical analysis, and Previous HitseismicNext Hit Previous HitinversionNext Hit. As a result an appropriate Previous Hit3-DTop geological model can be constructed for unique reservoir geology.

 

AAPG Search and Discovery Article #90163©2013AAPG 2013 Annual Convention and Exhibition, Pittsburgh, Pennsylvania, May 19-22, 2013