LITHO-SEISMIC CLASSIFICATION BASED ON ELASTIC ROCK PARAMETERS: CASE STUDY – SOUTH PECIKO FIELD OFFSHORE MAHAKAM DELTA
| Main Authors: | Widita, Santika Satya, Prabowo, Didiek Budhy, Khairy, Hilfan |
|---|---|
| Format: | Article PeerReviewed application/pdf |
| Bahasa: | eng |
| Terbitan: |
, 2017
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/274055/1/OBB-02.pdf https://repository.ugm.ac.id/274055/ |
Daftar Isi:
- Simultaneous seismic inversion was performed using the PSTM (Pre-stack Time Migration) data from Peciko field which is located at offshore Mahakam PSC. The study concentrated in the Peciko Main Zone area with 3km of burial depth. Five wells data which stand on the deltaic environment are used for this study. Sedimentary rocks are mostly found on the study area. The main objective of this study is to analyze the probability of facies in the study area based on lithology classification from elastic rock parameters that gained from seismic inversion IP (P-Impedance) and PR (Poisson Ratio). Every lithology such as sandstone, shale, or carbonate has its own different physical characteristic and can be distinguished by using well data (density and sonic log) and seismic inversion data (IP and PR cubes). Besides, cross-plot between IP and PR can also be the tools to differentiate fluid inside the formation, such as gas- or water-bearing sand reservoir. The analysis of lithology classification which based on the elastic rock parameter showed the information that can be used to more understand the lithology probabilities in the study area, also geological model. Distinguish the lithologies in the study area is quite challenging due to the depth of burial which is relatively deep and increase the compaction among the rocks. It impacted the result of seismic inversion IP and PR which shown a less correlation between those two elastic parameters therefore hardly to do the upscaling. In the other side, deltaic and shelf environment have contrast lithology which made it as one of the challenges that need to be resolved in this study. Cross-plot between IP and PR showed the lithology classification that fitted with its real model then the Probability Density Function (PDF) is used as the statistical approach to determine the facies’ probability. The result can be used for future well development. Keywords: Simultaneous Seismic Inversion, Poisson Ratio, P-Impedance, PDF