Papers by Benyamin Sapiie
of the MIT Deep Borehole group provided essential support in several technical and economic areas... more of the MIT Deep Borehole group provided essential support in several technical and economic areas. Finally, all concerned are greatly appreciative of the technical guidance provided by Sandia National Laboratories, and for the funding which provided a graduate research assistantship for Kristofer Jensen, who will prepare a separate report on his studies.
Field investigation is done to characterize fracture system in Kotopanjang Area. After acquisitio... more Field investigation is done to characterize fracture system in Kotopanjang Area. After acquisition of data in the field, we compare all of fracture properties statistically to analyze about damage zone, fractures orientation, find high/low strain zone, and relative age of fractures set. Scanline method is used to gather fracture attributes. In this method, we register all of fracture/fault attributes along observation lines. Measurement and analysis a number of fracture attributes in Kotopanjang area conclude that distribution of fracture oriented at N ± 210° E and N ± 255° E. Fractures set are fold and fault related fractured controlled by reverse right slip fault with trend N 335°E and NE-SW anticline. General fractures pattern are parallel an or form acute angle to bedding N 190-210° E. Fractures distribution is divided into six damage zone and three high strain zone with mean of fractures 5.67, 5.22, and 4.21 per meters. The data shows that older fractures less scattered with orientation N 192° E, N 168° E, N 11° E. Younger fractures have shorter length and more scattered strike.
Fractures can act as a major control on porosity distribution in carbonate reservoirs. Fractures ... more Fractures can act as a major control on porosity distribution in carbonate reservoirs. Fractures in limestone can be found in a wide range of scales, from millimeters to tens of meter long. In general, two different types of open fractures can be found; extensional fractures and stylolites. Both types can be equally important in controlling porosity and permeability distribution. One of the major problems in reservoir simulation of carbonate rocks is to determine the relationship between fracture distribution and facies. Detailed outcrop study of the Oligo-Miocene Rajamandala Formation has been carried out to characterize fracture type, distribution and density. The field observations were made using the one dimensional scan-line method and the data was analyzed utilizing standard statistical methods.
Proc. Indon Petrol. Assoc., 31st Ann. Conv., Mar 9, 2018
Fractures can act as a major control on porosity distribution in carbonate reservoirs. Fractures ... more Fractures can act as a major control on porosity distribution in carbonate reservoirs. Fractures in limestone can be found in a wide range of scales, from millimeters to tens of meter long. In general, two different types of open fractures can be found; extensional fractures and stylolites. Both types can be equally important in controlling porosity and permeability distribution. One of the major problems in reservoir simulation of carbonate rocks is to determine the relationship between fracture distribution and facies. Detailed outcrop study of the Oligo-Miocene Rajamandala Formation has been carried out to characterize fracture type, distribution and density. The field observations were made using the one dimensional scan-line method and the data was analyzed utilizing standard statistical methods.
Proceedings, May 23, 2011
One of the problems in understanding deformation in the earth crust involves simulating structura... more One of the problems in understanding deformation in the earth crust involves simulating structural development in the sedimentary basin. This can be achieved using analogue Modeling. Sandbox modeling is one of the types of analogue modeling in geological sciences in which the main purpose is simulating deformation style and structural evolution of the sedimentary basin. Two main scopes of this investigation mostly concentrate on developing physical/analogue geologic models using sandbox and conducting numerical modeling of Finite Element Method (FEM) as comparison approach. Variation in basement structures, thickness and rheology variation of the sedimentary package will control both structural pattern and geometry of the deformed sedimentary basin. Different deformational setting generates specific morphology in which their development and changing is marked by initiation of new structures. The relative speed of moving wall doesn’t have control in generating different structural styles. FEM using Geo-3D computer program has been verified to closely match analytical elastic solution and it have been successfully implemented to simulate sandbox experiment. The current program could be further developed to represent non-linear material behavior adopting a certain failure criteria and be able to simulate prescribed displacement.
Fractured basement reservoirs in Central Sumatera Basin would be a future Indonesian oil and gas ... more Fractured basement reservoirs in Central Sumatera Basin would be a future Indonesian oil and gas development. An analog outcrop model needs to be conducted as a first step toward predicting subsurface fracture system attributes. The Kotopanjang Area was chosen for this study because of good quality outcrops of pre-Tertiary basement of the Central Sumatera Basin. The Central Sumatra Basin is one of the most hydrocarbon prolific Indonesian Tertiary back-arc basins today. It was formed as a pull-apart basin related to NW-SE trending dextral strike-slip faulting. It experienced three tectonic deformation phases: Mesozoic compressional, Eocene-Oligocene extensional, and PliocenePleistocene compressional tectonics. The objective of this study was to conduct fracture characterization on basement outcrops and to obtain empirical and functional relationships between the fracture attributes. The methods used in this study included geological field mapping and scanline sampling, data sorting, data calculation, statistical analysis, and interpretation. Scanline sampling was conducted on pebbly mudstone (Carbon-Early Permian). Data calculation results were plotted in graphical form, analyzed statistically, and interpreted geologically. The results would be useful in predicting: (i) fracture zone width, (ii) geometry of fracture zone, and (iii) fracture porosity and permeability. The study area is dominated by NW-SE and NE-SW trending basement structures. The fractures observed in study area include fault-related fracture systems. Two damage zones can be observed in scanline sampling: Damage Zone #1 and Damage Zone #2. Damage Zone #1 shows that the fractures are related to dextral strike-slip faulting. Damage Zone #2 shows that the fractures are related to normal faulting. Both of damage zones indicate several high strain zones with average intensity of three to five fractures per meter. Rose diagrams illustrated three main fracture orientations: NE-SW, NNE-SSW, and WNW-ESE trending fractures. The NE-SW trend consists of two average strike orientations N 215° E and N 235° E represented by conjugate fractures systems. The NNE-SSW trend with an average strike of N 185° E is represented by joints and veins. Veins trend WNW-ESE. We summarize that the main stress controlling all the fractures was in the NNESSW direction. Fracture spacing, length, and thickness cumulative distribution plots demonstrated that all fractures follow Power-Law distribution with fractal dimension (D) 1.0 to 2.
Abstract Ertsberg Intrusion is one of a number of Pliocene intrusions cutting a thick sequence of... more Abstract Ertsberg Intrusion is one of a number of Pliocene intrusions cutting a thick sequence of Tertiary limestone located in the Gunung Bijih Mining District (GBMD) of PT. Freeport Indonesia in Papua, Indonesia. This study is focused on detailed structural analysis of the Ertsberg Intrusion and its relationship to the tectonic evolution of the district (Figure 1). The Ertsberg Intrusion cuts all of the Cretaceous-Miocene strata in the study area, consisting of Kembelangan Group and New Guinea Limestone Group. Three major faults, each of which is more than 10 meters in width, were measured in the study area: Wanagon Fault, Hanging Wall Fault, and West Fault. All of these faults show left-lateral strike-slip movement. More than 2,000 structural measurements of minor faults, veins, shear fractures, and foliations have been collected from the study area. Minor faults, which have clay gouge less than 1 m in width, are divided into three groups based on kinematic analysis, and are interpreted as Riedel fracture systems related to the movement of the major faults. Kinematic analysis of these faults shows two different axial trends. Minor faults surrounding the Wanagon Fault and Hanging Wall Fault show NE-SW shortening and NW-SE extension, but the kinematic analysis of minor faults surrounding the West Fault shows N-S shortening and E-W extension. Two deformation events are inferred from kinematic analysis. The first is related to the formation of major NW trending foldbelt with minor thrust. The second event is dominated by numerous evidence of strikeslip faulting. All of the extension fractures in the research area show NW-SE extension, suggesting they formed at the second deformation stage. This stage produced fractures that provided space for the emplacement of the Ertsberg Intrusion.
Proceedings, Apr 9, 2018
The distribution of the Pre-Tertiary rocks in eastern Indonesia especially the Mesozoic reservoir... more The distribution of the Pre-Tertiary rocks in eastern Indonesia especially the Mesozoic reservoir is not as simple as it was interpreted before. Their facies distribution across the passive margin appear to be heavily influenced by old tectonic grains such as grabens that are now observable in recently available data utilized in this study. Similar to reservoir distribution, the Pre-Tertiary source rocks facies are also appear to be controlled by Paleozoic-Mesozoic grabens. New play system in Birds Head of Papua was identified as Triassic and Early Jurassic reservoir and Paleocene Daram Sandstone.
2012 GSA Annual Meeting in Charlotte, Nov 7, 2012
IOP Conference Series: Earth and Environmental Science
The study aims to determine fracture characteristics such as orientation, fracture attributes, fr... more The study aims to determine fracture characteristics such as orientation, fracture attributes, fracture density distribution, and mineral composition of quartz and feldspar. The study used photogrammetry data to know the distribution and geometry of macro-scale fracture, linear scanline and windows scan data to understand the characteristics of mesoscale fracture attribute, and thin section rocks data from oriented samples to determine petrographic analysis and micro-scale fracture. After analyzing each of these data, analog basement fractured reservoir modeling could be built from integrating the data and modeling parameters based on available fieldwork data. The fault in the research area is represented as a Riedel shear 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 types, namely alkali feldspar granite, ...
EGU General Assembly Conference Abstracts, Apr 1, 2016
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Papers by Benyamin Sapiie