SEQUENCE STRATIGRAPHIC AND SEISMIC MULTI ATTRIBUTE APPROACH TO MODEL THE TELISA SANDSTONE OF GUMAI FORMATION IN RIMAU BLOCK SOUTH SUMATERA PROVINCE
Geographically, the study area is situated 70 km northwest from Palembang city, South Sumatra province. It is part of Rimau block PSC which is operated by PT. XYZ. Geologically, the study area is situated on the edge of the Jemakur Graben and part of the Palembang High which is located on the easter...
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Format: | Theses |
Language: | Indonesia |
Online Access: | https://digilib.itb.ac.id/gdl/view/12660 |
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Institution: | Institut Teknologi Bandung |
Language: | Indonesia |
Summary: | Geographically, the study area is situated 70 km northwest from Palembang city, South Sumatra province. It is part of Rimau block PSC which is operated by PT. XYZ. Geologically, the study area is situated on the edge of the Jemakur Graben and part of the Palembang High which is located on the eastern side of the South Sumatra Basin. The scope objective is limited to Early-Middle Miocene Telisa sandstone which is part of the Gumai Formation. The Telisa sandstone reservoir has been proven to produce hydrocarbon in the several oil fields within the Rimau block, South Sumatra. The objective of this research is to model the sandstone distribution by applying the approach of sequence stratigraphy concept and seismic multi attribute method. The Telisa sandstone is composed by fine to very fine grained calcareous sandstone, carbonaceous shales, glauconite and thin streak of limestone laminae. Geological analysis indicates the sandstone as a shelf ridge deposit resulted from wave erosion of previously lowstand deposit during Early-Middle Miocene marine transgression influence by high wave energy and relatively weak tidal energy. It is a part of an Early to Middle Miocene TST-2 deposited above the 18 m.a SB-2 surface. The aim of seismic multi attributes modeling of this research is to predict the lateral and the vertical distribution of the Telisa sandstone. The cross plot analysis resulted in that only the Gamma Ray log is appropriate to be used as target log for the modeling. The first pseudo-GR cube which is resulted from the first seismic attributes training is assigned as an input data for the second training. The second training has resulted in 68% correlation pseudo-GR cube. The integration of sequence stratigraphic concept and the seismic multi attribute methods has resulted into a model of the Telisa sandstone as numerous isolated shelf ridge with a relatively northwest-southeast orientation. The sands have an elongated geometry; length can be more than 5 km but the width just 1 or 2 km. The distribution model then will be used as guidance for the next Telisa sandstone exploration campaign. |
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