Fracability Modeling in Shale Hydrocarbon Development Based on Geomechanical Analysis of Well Log and Mineralogy Analysis of Drill Cuttings: A Case Study of the Lower Baong Fm and the Belumai Fm of the NSB-001 Well in the North Sumatra Basin, Indonesia

Abstract The North Sumatra Basin, Indonesia has a very large shale hydrocarbon potential, especially from the Lower Baong Formation and the Belumai Formation. The Belumai and Lower Baong Formations were deposited in the Early Miocene - Middle Miocene, in transgression conditions, when the North Suma...

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Published inIOP conference series. Earth and environmental science Vol. 1378; no. 1; pp. 12012 - 12026
Main Authors Buntoro, Aris, Rahmad, Basuki, Nurcholis, M., Septama, Erlangga, Haryanto Lukmana, Allen, Anuraga, Edo
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.07.2024
Subjects
Case studies
Clay minerals
Compressive strength
Correlation
Data analysis
Fluid flow
Fractures
Geomechanics
Hydraulic fracturing
Hydrocarbons
Kaolinite
Lithology
Mineralogy
Miocene
Regional development
Regional planning
Rocks
Shale
Shales
Smectites
Sumatra
Indonesia
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Summary:Abstract The North Sumatra Basin, Indonesia has a very large shale hydrocarbon potential, especially from the Lower Baong Formation and the Belumai Formation. The Belumai and Lower Baong Formations were deposited in the Early Miocene - Middle Miocene, in transgression conditions, when the North Sumatra Basin was in the regional sagging phase. These conditions greatly affect the facies and diagenetic changes of quartz, smectite and kaolinite minerals in rock fracability. The main problem in producing shale hydrocarbons is the very low permeability of unconventional-shale-reservoirs, so that at the production stage of shale hydrocarbon, a fracability model is needed as a basis for planning hydraulic fracking, thus the fractures are connected to each other and can flow the hydrocarbon fluid optimally. From the results of previous studies, it was shown that the shale hydrocarbon fracability value was controlled by lithofacies, and correlated with rock brittleness, brittle mineral content, clay content, and compressive strength. The fracability model is used to determine fracable zone intervals as a candidate for hydraulic fracking, by using geomechanical analysis of well log data and mineralogy analysis of drill cuttings data from the NSB-001 well as a case study. Based on the correlation results of lithology (Mud Log), mineralogy analysis, MBT, and TOC (Drill Cuttings), the sweetpot fracable window (fracable zone interval) can be determined, which is correlated with the presence of fracture barrier.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/1378/1/012012