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North Sumatra Basin is a back-arc basin which lies on the northern part of Sumatra. It is one of the productive basins in Indonesia. Based on previous studies, this basin has overpressured zone which causes some problems in drilling process, such as blowout. However, those studies have not yet relat...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/18629 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | North Sumatra Basin is a back-arc basin which lies on the northern part of Sumatra. It is one of the productive basins in Indonesia. Based on previous studies, this basin has overpressured zone which causes some problems in drilling process, such as blowout. However, those studies have not yet related the overpressure and groundwater flow. <br />
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The purpose of this study is to seek a relationship between the overpressure and groundwater flow at four wells in Aru Field, PT Pertamina working area. Wireline log, pressure data from drilling mud, and drilling report are the data which are used during this study. Using wireline log and looking for its reversal are the method to detect the overpressure. This method has to be confirmed with drilling mud pressure, lithology, and Eaton’s pore pressure. <br />
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The result of this study shows that overpressure zone in the research area is located in the lower part of Keutapang Formation and Baong Formation. The precence of shoulder effects in wireline log and Eaton’s pore pressure in Middle Baong Sandstone are observed consistently. These shoulder effects indicate the precence of groundwater flow from east to west. Stratigraphic correlation and isopach map show that Middle Baong Formation is thinning towards south-southwest. |
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