Abstract
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.
Highlights
Source rock in the Central Sumatra Basin, consists of four shale formations, namely: the Petani and Telisa Formation [1], Pematang Group [2], and coal Sihapas Group [3]
The purpose of this research is to determine the fracable zone interval in the Brownshale formation by using the correlation of the results of X-ray diffraction (XRD), Total Organic Carbon (TOC), Ro, and Methylene Blue Test (MBT) analysis from drill cuttings of well BS-03, and from this correlation shows that the presence of sillimanite and kaliophilite minerals as minor minerals is very influential on changes in shale character and hydrocarbon generation which correlates with fracable zone interval as good candidates for hydraulic fracking planning
From the results of XRD analysis, an interesting phenomenon was found, namely the presence of sillimanite and kaliophilite minerals in the Brownshale formation which was significantly started at a depth interval of 10,780 ft downward, both of which belong to the brittle mineral category [25]
Summary
Source rock in the Central Sumatra Basin, consists of four shale formations, namely: the Petani and Telisa Formation [1], Pematang Group [2], and coal Sihapas Group [3]. It shows that only the Brownshale formation from Pematang Group is the main rock source in Central Sumatra, which is spread over several sub-basins (troughs), namely: Balam, Rangau, Kiri, Aman, and Bengkalis [4]. From the results of previous research, it was stated that in general the Brownshale formation has good prospects for the development of shale hydrocarbon, supported by several parameters, including: TOC (fair - very good), kerogen type II/III, brittleness index greater than 0.48, and the rock compressive strength is below 70 MPa [5]. In general brittleness is used as a descriptor in the selection of depth interval for hydraulic fracking planning, so brittleness is one of the most important rock mechanical properties, and is used in determining the prospect of shale hydrocarbon [7] [8] [9] [10] [11]
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