FRACTURE CHARACTERISTICS ANALYSIS FOR NATURALLY FRACTURED RESERVOIR (NFR) ANALOGUE IN GRANITIC ROCKS AT MUARO SILOKEK, WEST SUMATRA
Naturally fractured reservoir (NFR) is an object of oil and gas exploration that is developing and has been carried out by foreign and domestic companies in Indonesia. Especially in basement rocks which is generally crystalline rock originating from intrusive or extrusive igneous rocks or low to hig...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/40548 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Naturally fractured reservoir (NFR) is an object of oil and gas exploration that is developing and has been carried out by foreign and domestic companies in Indonesia. Especially in basement rocks which is generally crystalline rock originating from intrusive or extrusive igneous rocks or low to high degree metamorphic rocks. The exploration of basement rocks is necessary to know fracture characteristics such as orientation, fracture attributes, fracture density distribution and other controlling factors, namely lithology or mineral composition. Generally in modeling natural fracture reservoirs, especially granitic basement rocks, quartz mineral composition factors are always ruled out. Whereas the composition of quartz has a significant influence on the response to fracture density in fault damage zone.
The study was conducted using photogrammetry data for macro scale fracture analysis, linear scanline and windows scan data for meso scale fracture analysis, and thin section rocks data from oriented samples for micro-scale fracture analysis. After each of these data is analyzed, analog reservoir modeling could be build from the integration of the data and using modeling parameters based on available field data.
The Muaro Silokek Area is a location that is quite complex in geological structure and consists of granitic rocks which vary in mineral composition. The main fault affecting the direction of fracture orientation is the right lateral strike slip faults with the NW-SE orientation. The fault in the research area is represented as a riedel shears with the orientation direction of NNW-SSE, NE-SW, and ENE-WSW. The fracture density is influenced by its position on the fault and increases in the fault damage zone. The granite type in the study area was divided into three, namely alkali feldspar granite, syenogranite, and monzogranite. Each of the granite types has a different response to fractures, and shows that the greater the composition of quartz and k-feldspar in the fault damage, the fracture density will increase.?
The density value in analog modeling Natural Fracture Reservoir is the sum of the analysis of density from Digital Outcrop Modeling (DOM) data, fracture density models around faults, and lithological fracture density models around faults. The average value of 3D fracture density is 1 / m3. Estimation of permeability and fracture porosity values in NFR modeling shows a range of 0,002-0,01 md for permeability and 0,02-0,08% for porosity values. Fracture permeability values are strongly influenced by geometry of fracture position and fracture aperture, while fracture porosity values are influenced by fracture density.
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