Fault assessment for basement reservoir compartmentalization: Case study at Northeast Betara gas field, South Sumatra Basin

Risyad, Mohammad; Suta, I Nyoman; Haris, Abdul

doi:10.1063/1.4991290

Cited by 5 publications

(2 citation statements)

References 5 publications

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“…The basin itself is subdivided into four sub-basin due to compressional and extensional tectonic phase that took place during Cretaceous to Eosen [8]. Talang Akar Formation consists of delta plain sediments with shale, silt, and quartz sandstone and interbedded carbonaceous shale, coals, and some conglomerates [9].…”

Section: Methodsmentioning

confidence: 99%

Integrated Avo, Elastic Seismic Inversion and Petrophysical Analysis for Reservoir Characterization: A Case Study of Gas Field, South Sumatera Basin

Haris

Sandrina

Riyanto

2018

SPEKTRA

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Integrated Amplitude Versus Offset ( AVO), elastic seismic inversion and petrophysical analysis have been successfully applied to estimate the elastic parameters of the reservoir for a case study of the gas field in south Sumatera basin. This paper aims to have better understanding the petrophysical properties of the reservoir. The petrophysical analysis was carried out by performing routine formation evaluation that includes calculation of shale volume, porosity, and water saturation of basic well log data. Sensitivity analysis was conducted to evaluate the sensitivity parameters of the log for changing in lithology, porosity, and fluid content in the reservoir. For completing the availability of elastic parameter from well log data, shear wave logs were derived from Castagna’s mudrock line relationship. Further, P-impedance, S-impedance, VpVs ratio, LambdaRho (λρ), MuRho (μρ) and density(ρ) were then calculated through a Lambda-Mu-Rho (LMR) transformation. Prior to performing AVO analysis and elastic seismic inversion, super gather technique was applied to improve the reliability of pre-stack seismic data. Elastic seismic inversion was carried out to extract the lateral elastic properties to capture lithology and fluid changes in the reservoir. In addition, AVO analysis of pre-stacked data was applied to identify hydrocarbon-bearing sandstone at target zone. The petrophysical analysis shows that porosity versus density crossplot is able to distinguish sand-shale based on 34% shale volume cutoff, while LMR crossplot is able to delineate hydrocarbon zone at water saturation value under 65%. The predicted lateral elastic parameter shows slightly higher value compare to overlying layer.

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Section: Methodsmentioning

confidence: 99%

Integrated Avo, Elastic Seismic Inversion and Petrophysical Analysis for Reservoir Characterization: A Case Study of Gas Field, South Sumatera Basin

Haris

Sandrina

Riyanto

2018

SPEKTRA

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“…By assessing the juxtaposition, the connectivity of sand reservoir can be defined based on the fault plane [4,5]. This means that a sealing or leaking fault can be identified from reservoir hydrocarbon-water contact in the fault plane [16,17]. The reservoir contact, which is indicated by sand-sand juxtaposition, is known as a leaking fault.…”

Section: The Application Of Fsa For Reservoir Compartment Assessmentmentioning

confidence: 99%

Reservoir Compartment Assessment: A Case Study of Bangko and Bekasap Formation, Central Sumatra Basin Indonesia

Haris¹,

Anindya

Indra³

et al. 2018

GEOMATE

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ABSTRACT:The reservoir compartment assessment for a case study of the Agur field, Central Sumatra Basin has been successfully carried out by using fault seal analysis (FSA). The objective of this paper is to asses subsurface fault properties in term of the fault sealing that was defining the hydrocarbon reservoir compartment. In this work, the FSA was performed by integrating juxtaposition, shale gouge ratio (SGR) and transmissibility analysis over fault plane that was identified within reservoir layers on the Bangko and Bekasap formation. The juxtaposition seal is intended to assess how the reservoir layer is juxtaposed across the fault plane over either reservoir or non-reservoir layer. The SGR analysis is applied to estimate the shale content in the fault plane, which is caused by the fault movement of sequence stratigraphy. The last analysis of transmissibility is carried out to calculate the capacity of a reservoir to drain the hydrocarbon through a fault plane. Faults architecture (throw, heave, and orientation) and the reservoir layer target were identified based on 3D seismic and well log data interpretation. The FSA is applied to nine faults that formed nine reservoir compartments within three reservoir layers, which are obtained from 3D seismic and well log interpretation. The fault characteristics were classified and the fault seal distribution map was produced to identify the reservoir connectivity among the faults. The FSA results show that nine identified compartments in the first reservoir layer are clustered into five compartments. In addition, the FSA clustered nine identified compartments in the second reservoir layer into four compartments. In contrast, nine compartments in the third reservoir layer were connected each other that are clustered into one compartment. These results are useful not only for evaluating future hydrocarbon traps but also for future field development.

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Naturally Fractured Basement Reservoir Potential Quantification from Fracture Model and Petrophysical Analysis by Leveraging Geostatistics and Seismic Interpretation: A Case Study in Jabung Block, South Sumatra Basin

Herianto

Fadhil

Qolbi

et al. 2018

Springer Series in Geomechanics and Geoengineering

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Fault assessment for basement reservoir compartmentalization: Case study at Northeast Betara gas field, South Sumatra Basin

Cited by 5 publications

References 5 publications

Integrated Avo, Elastic Seismic Inversion and Petrophysical Analysis for Reservoir Characterization: A Case Study of Gas Field, South Sumatera Basin

Integrated Avo, Elastic Seismic Inversion and Petrophysical Analysis for Reservoir Characterization: A Case Study of Gas Field, South Sumatera Basin

Reservoir Compartment Assessment: A Case Study of Bangko and Bekasap Formation, Central Sumatra Basin Indonesia

Naturally Fractured Basement Reservoir Potential Quantification from Fracture Model and Petrophysical Analysis by Leveraging Geostatistics and Seismic Interpretation: A Case Study in Jabung Block, South Sumatra Basin

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