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EAGE Conference on Reservoir Geoscience
- Conference date: December 3-5, 2018
- Location: Kuala Lumpur, Malaysia
- Published: 03 December 2018
81 - 87 of 87 results
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Unravelling Complex Reservoir Architectures In The Malay Basin
Authors D. Shields, W.M.N.B. Wan Mohamed Zin, A. Trianto and J. PlataSummaryUnderstanding the lateral equivalence of reservoir units is a critical precursor for predicting dynamic reservoir behaviours, including the pattern of fluid migration over a field’s production lifespan. Hence, to improve our understanding of inter-reservoir continuity and communication, this study applied a sequence stratigraphic approach for reservoir delineation over a variety of scales
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Core Based Approaches for The Characterisation Of Heterolithic Reservoirs
Authors D. Shields, S. Sanyal and A. AsifSummaryConventional petrophysical estimates of reservoir properties in finely laminated, heterolithic reservoirs can be problematic due to (1) the application of log-based approaches that do not fully capture the influence of rock fabric upon reservoir quality and (2) the resolution of conventional wireline investigations which result in biased properties at the wireline log scale (0.15 meter). To address these limitations a core-based modelling trial was undertaken in which process oriented models were developed to represent core-scale facies. Comparison of model outcomes indicates that the process oriented model derived kh results are closer to the values in the history-matched static model than initial petrophysical interpretation.
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An Improved Nmr Permeability Model Suitable for Macromolecular Diffusion
More LessSummaryBy combining experiments of macromolecular extraction with Darcy’s law and Poiseuille equation, an improved nuclear magnetic resonance (NMR) permeability model suitable for macromolecular diffusion is obtained. The model includes the physical parameters of movable and irreducible fluid, pore throat ratio rb/rt, tortuosity and the thickness of chemical bond water film and macromolecule film. Scanning electron microscopy(SEM), transmission electron microscopy(TEM), infrared spectroscopy (FTIR) and NMR experiments confirmed the existence of irreducible macromolecules and movable macromolecules. It also explains the reason the T2 spectrum shifts to the left after extraction from different angles. The results show that the proportion of irreducible fluid of samples with NMR characterization can reflect the variation tendency of irreducible macromolecule and water, and the mean value of NMR characterization is 20.6% which is close to the result of chemical extraction 37.38%. By simplifying the pores of extracted samples, the thickness model of irreducible macromolecule and water is established firstly and the total thickness is 1.482nm, 1.585nm,1.674nm,1.834nm. The permeability results of mercury injection experiment are 509.68mD, 472.85mD, 581.89 mD, 555.76 mD are basically the same with the results of the improved NMR permeability model which are 739.34 mD,602.13 mD,527.65 mD,625.93 mD.
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Basement Exploration In The Malay Basin: Characterizing Granitic Rocks Via The Integration Of Mineralogy, Rock Chemistry And Log Responses
Authors A.A. Suhaimi, N. Pendkar and M. M AliSummaryFractured basement exploration is a globally proven play, with high potential shown in many fields. While all the basement rocks have hydrocarbon occurrence, felsic basements are profiled with high hydrocarbon flow due to extensive fault systems and excellent fracture networks. The recognition of the ideal basement type and compositional variation within a plutonic body (mafic versus felsic) can lead to increased exploration success. Lithofacies prediction within conventional reservoirs can be derived from seismic data, but the same workflow fails for basement exploration due to the complex origin of basement lithology. The application of wireline log data has been extensively used in sedimentary reservoirs, but not as extensively in basement rocks due to a limited understanding and application. In this study, the relationships between mineralogy, rock chemistry and log responses of basement reservoir were investigated using datasets obtained by robust wellsite analytical tools. The geochemical classification and wireline log based approach gives good results. The integrated workflow provides a robust technique for understanding the lithology and nature of basement rocks. This approach can be used in conjunction with other geophysical tools to improve the understanding of the drilled basement for a better geological modeling.
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Moveable Fluid Saturation Of Tight Sandstone And Its Formation Mechanism: A Case Study Of Zhenbei Oil Field In Ordos Basin
More LessSummaryTight sandstone makes pore structure extremely complex and one of its effects is the commonly lowness of movable fluid saturation which directly controls economic profits. Because of highly burial depth around 2100m, the reservoir has experienced strongly digenesis. The primary intergranular porosity lost by compaction and silicon cementation is great. Later dissolution of debris is conducive to secondary pore formation and dissolved pore cemented by clay minerals can turn out to be crystalline pore, the quality of which is worse than that of dissolved pore. The throat-body volume is usually roughly the same as the pore-body volume. With the common sense of radius of throat smaller than that of pore, it is easy to understand the number of throats bigger than that of pores. The average movable fluid saturation is less than 50%. Compaction and silicon cementation are basic causes of tight sandstone. Dissolution is the mainly constitute of movable fluid saturation and crystalline pore ‘contribution to movable fluid saturation is poor. The pore-body volume accounts for main part of movable fluid saturation and the contribution of throat-body volume to movable fluid saturation depends on the distribution of throat radius. Large throat has bigger contributive potential than small one. Factors of movable fluid saturation have been then divided into two groups: The former includes dissolved pore content and pore-body volume while crystalline pore content and throat-body volume consist of the inferior one.
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Roadmap For Integrated Play To Prospect Exploration: An Efficient Process For Effective Decisions
More LessSummaryAn efficient exploration process map has been developed using business process modeling, which align the technical workflows in context of corporate goals to build a successful exploration pathway. It defines multi-domain workflows for play-based exploration from basin scale to prospect scale and the guidance to produce appropriate elements for the required business decision in each stage. The structured business process hierarchy enables selection of optimal technical workflows required to deliver the desired business outcome. It facilitates a clearer understanding of the endpoint result and interdependency of different technical activities including clear pathways between the gates; thus, significantly improving the efficiency of technical resources to produce a high-quality, timely and trusted result.
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Successful Integration Of Subsurface Disciplines Leading To New Oil Discovery: A Case Study From A Balingian Oil Field, Offshore Sarawak, Malaysia
Authors C.K. Tan, Z. Timah, I. Ong, A. Ng Kwai Loong, A. Aeria and A.L. YahyaSummaryThe recent drilling campaign in 2017, undertaken by ROC Oil in partnership with Petronas and Dialog, was to appraise hydrocarbon potential in two new fault blocks and to maximize oil production from current producing fault blocks in a small satellite field in the Balingian basin, offshore Sarawak. Multiple well target optimizations and revisions had taken place prior to and even during the drilling campaign, in response to the results and technical challenges encountered. All the wells in the drilling campaign encountered new oil-bearing sands in the deeper C2C reservoir including re-classified oil in one drilled fault block, previously interpreted as a gas reservoir, based on the open-hole sampling data acquired from one of the appraisal wells in 1982. The successful integration of the subsurface disciplines has led to a significant increase in STOIIP and reserves for the field.
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