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This research discusses about the cause of overpressure in Langkat, North Sumatera Basin. The understanding of the cause of ovepressure is a very important element in <br /> <br /> <br /> <br /> <br /> determining the success to predict overpressure in oil and gas...
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| Main Author: | |
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/17541 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | This research discusses about the cause of overpressure in Langkat, North Sumatera Basin. The understanding of the cause of ovepressure is a very important element in <br />
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determining the success to predict overpressure in oil and gas drilling activity. The methods used in this research are based on wireline log data analysis which consists of <br />
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gamma ray log, sonic log, density log, and neutron log together with cross-plot analysis between the parameters of the wireline logs. Results of the analysis show that the ovepressure in the research area is caused by unloading mechanism as a result of clay mineral diagenesis. This process transformed smectite to illite and illite to kaolinite due to temperature which reached the ideal <br />
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condition to transformed the minerals. The process produced fluid as a result of the reaction. The overpressure in the research area occurs at depths beginning from 4,000 ft, except at Besitang-1 well, where it begins to occur at the depth of 1,413 ft. It is distributed in Baong Formation, which is dominated by clay which has low permeability. |
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