GEOLOGY, FRACTURE CHARACTERISTIC, AND FRACTURE DISTRIBUTION ANALYSIS ON BASEMENT ROCK OUTCROP IN RENAH PEMBARAP, MERANGIN, JAMBI
Each year, Indonesia has an increasing demand for its oil and gas. This can be addressed by searching for reservoirs in igneous or metamorphic rocks which are intensively fractured. Renah Pembarap has igneous and metamorphic rocks which are part of the bedrock in Jambi, this indicates a bedrock rese...
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| Format: | Final Project |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/50528 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Each year, Indonesia has an increasing demand for its oil and gas. This can be addressed by searching for reservoirs in igneous or metamorphic rocks which are intensively fractured. Renah Pembarap has igneous and metamorphic rocks which are part of the bedrock in Jambi, this indicates a bedrock reservoir in the area. This study presents the results of geological mapping and special studies on bedrock using linear scanline and scanline window method. The research area has four geomorphological units consisting of the Malihan Adat Ridge Unit, Renah Pembarap Erosion Flatland Unit, Aceh Intrusion Hills Unit, and Batang Merangin Alluvial Flatland Unit. In addition, the lithology of granites, slates, tuffs, sandstones, and conglomerates is scattered in the research area through geological processes that have occurred since the Late Triassic. The study area has two dextral faults called the Guguk Fault with a damage zone width of 47.6m and the Air Batu Fault with a damage zone width of 156m. In the study area, the bedrock has four sets of open fractures which are distinguished based on their direction and presence in a particular lithology. The shear fractures that are formed, were following the direction of the main stress (?1) that has occurred since the Late Triassic. The intensity values of natural fracture ranged from 10/m - 30/m for granite and 8/m - 50/m for slates. While its density values ranged from 30/m² - 300/m² on granite and 50/m² - 330/m² on slates. The fractal value of natural fractures in bedrock which is exposed in the special study area ranges from 0.31 to 1.53 with a dimension range of 1 - 2. The estimation value of porosity and permeability with the average fracture width resulted in a value of 0.01 - 0.11% and 0.12 – 538.02 darcy. Meanwhile, the value of porosity and permeability with a minimum data value of fracture width resulted in a value of 0.0022 - 0.0157% and 0.004 - 0.029 darc |
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