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shale hydrocarbon Development Based on Drill Cuttings &TOC Analysis: Case Study of Brownshale Drill Cuttings of Well BS-03, Pematang Formation, Bengkalis Trough, Central Sumatra Basin

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Open Journal of Yangtze Oil and Gas 2020年第3期5卷 87-102页

作者： Aris Buntoro Carolus Prasetyadi Ricky Adi Wibowo Suranto Petroleum Engineering Department UPN “Veteran” Yogyakarta Indonesia India Geological Engineering Department UPN “Veteran” Yogyakarta Indonesia India Upstream Technical Center PT. Pertamina (Persero) Indonesia India

Brownshale is a lithology unit in the middle of the Pematang Formation consisting of brown to black shale that is deposited in the lacustrine environment. Brownshale from the results of previous studies stated as the main source rock in the Central Sumatra Basin, which is spread over several troughs, namely Balam, Aman, Rangau, Kiri, and Bengkalis Troughs, where Bengkalis Trough is the most extensive Trough. In the shale hydrocarbon prospecting analysis, Brownshale from previous researchers concluded that it had good prospects, based on several parameters including: TOC values with poor to very good quality. Brownshale formation is a type of kerogene as kerogen type of II/III, brittleness index greater than 0.48, and rock compressive strength below 10,000 Psi. One method in the development phase of shale hydrocarbon is to determine the fracable sweetspot window using drill cuttings and TOC, because there is no core data available. Based on the results of the well log analysis of well BS-03, it is obtained information that the Brownshale formation has a thickness of 1028 feet with intercalation laminated shale/sand section, so the mineral content varies greatly. From the ternary diagram of XRD (bulk analysis) results of drill cuttings of Brownshale formation of well BS-03, it can be seen that mineral distribution of Quartz-Clay-Calcite (Q-C-C) is spread between zone 1 to zone 3, namely: Dominant Quartz - Minor Clay & Carbonate (Zone 1: Brittle Quartz Rich), Dominant Carbonate - Quartz & Minor Clay (Zone 2: Brittle Carbonate Rich), and Quartz & Carbonate Balance - Clay minor (Zone 3: Ductile, hard to frac). This shows that not all Brownshale formation intervals are easy to frac (high fracability). From the XRD result, percentage of mineral content (bulk analysis) of Brownshale drill cuttings, there is an interesting phenomenon, i.e. the presence of sillimanite and kaliophilite minerals significantly starting at a depth of 10,780 ft and below, where both minera

关键词： shale hydrocarbon Mineralogy (XRD) Analysis TOC Analysis Fracability Model

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Correlation of Sillimanite &Kaliophilite Minerals, TOC, Ro, and MBT from Drill Cutting of Well BS-03 in the Development of shale hydrocarbon, Brownshale Formation, Bengkalis Trough, Central Sumatra Basin, Indonesia

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Open Journal of Yangtze Oil and Gas 2020年第4期5卷 216-230页

作者： Aris Buntoro Mohammad Nurcholis Basuki Rahmad Allen Haryanto Lukmana Petroleum Engineering Departement UPN “Veteran” Yogyakarta Yogyakarta Indonesia Department of Soil Science UPN “Veteran” Yogyakarta Yogyakarta Indonesia Department of Geological Engineering UPN “Veteran” Yogyakarta Yogyakarta Indonesia

Sillimanite is a brittle mineral as a metamorphic mineral product which is generally derived from clay, along with an increase in pressure and high temperature (600°C - 900°C), and kaliophilite is also a brittle mineral as a potassium bearing in the sand-shale series, which contributes to the clay diagenesis process. In the development of shale hydrocarbon in the Brownshale formation in the Bengkalis Trough, Central Sumatra Basin, using the correlation of the XRD (bulk and clay oriented), TOC, Ro, and MBT analysis results from the drill cuttings of well BS-03, so that the fracable zone interval can be determined. From this correlation, it shows that the presence of sillimanite and kaliophilite minerals as minor minerals greatly affects the changes in shale character and hydrocarbon generation, where at depth intervals of 10,780 ft downward (sand series-shale) there is an interesting phenomenon, i.e. low MBT, low TOC, and high Ro, so it is believed that the depth interval of 10,780 ft downward is a fracable zone interval (brittle shale) which is a good candidate for hydraulic fracking planning, while the upper depth interval is a fracture barrier.

关键词： Sillimanite & Kaliophilite Minerals TOC (Total Organic Carbon) Ro (Vitrinite Reflectance) MBT (Methylene Blue Test) shale hydrocarbon

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