The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Guy Vasseur - One of the best experts on this subject based on the ideXlab platform.
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Testing Oil Saturation distribution in migration paths using MRI
Journal of Petroleum Science and Engineering, 2020Co-Authors: Weimin Wang, Fang Chen, Renaud Toussaint, Jean Schmittbuhl, Guy Vasseur, Likuan ZhangAbstract:International audienceMagnetic Resonance Imaging (MRI) method allows to observe the distribution of different fluids in situ in porous media, and to measure Oil and water Saturation. Although this technique has great advantages compared to others, there remains large space for assessing the method and improving the accuracy of measurement. Using MRI, the Oil secondary migration paths are scanned to measure the Saturation distribution during the laboratory experiments. The resulting map can be calibrated using a device with the same pore structure as the probed sample and fully saturated with Oil. This device is scanned with the probed sample at the same time in order to calibrate the Saturation. The Spin-echo multi-slices sequence (SEMS) is adopted for MRI to ensure that the Oil Saturation in migration paths is accurately measured. The relevant spatial resolution of the mapping is defined according to the concept of REV (representative elementary volume). The Oil Saturation resulting from data obtained using different image formats are compared and the resulting Saturation evaluation is compared to direct bulk Saturation measurements. This comparison demonstrates that the calculated MRI Oil Saturation using DICOM image format is quite accurate, with a relative error less than 2%
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testing Oil Saturation distribution in migration paths using mri
Journal of Petroleum Science and Engineering, 2012Co-Authors: Weimin Wang, Fang Chen, Renaud Toussaint, Jean Schmittbuhl, Guy Vasseur, Likuan ZhangAbstract:Magnetic Resonance Imaging (MRI) method allows to observe the distribution of different fluids in situ in porous media, and to measure Oil and water Saturation. Although this technique has great advantages compared to others, there remains large space for assessing the method and improving the accuracy of measurement. Using MRI, the Oil secondary migration paths are scanned to measure the Saturation distribution during the laboratory experiments. The resulting map can be calibrated using a device with the same pore structure as the probed sample and fully saturated with Oil. This device is scanned with the probed sample at the same time in order to calibrate the Saturation. The Spin-echo multi-slices sequence (SEMS) is adopted for MRI to ensure that the Oil Saturation in migration paths is accurately measured. The relevant spatial resolution of the mapping is defined according to the concept of REV (representative elementary volume). The Oil Saturation resulting from data obtained using different image formats are compared and the resulting Saturation evaluation is compared to direct bulk Saturation measurements. This comparison demonstrates that the calculated MRI Oil Saturation using DICOM image format is quite accurate, with a relative error less than 2%.
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Testing Oil Saturation distribution in migration paths using MRI
Journal of Petroleum Science and Engineering, 2012Co-Authors: Weimin Wang, Fang Chen, Renaud Toussaint, Jean Schmittbuhl, Guy Vasseur, Likuan ZhangAbstract:Magnetic Resonance Imaging (MRI) method allows to observe the distribution of different fluids in situ in porous media, and to measure Oil and water Saturation. Although this technique has great advantages compared to others, there remains large space for assessing the method and improving the accuracy of measurement. Using MRI, the Oil secondary migration paths are scanned to measure the Saturation distribution during the laboratory experiments. The resulting map can be calibrated using a device with the same pore structure as the probed sample and fully saturated with Oil. This device is scanned with the probed sample at the same time in order to calibrate the Saturation. The Spin-echo multi-slices sequence (SEMS) is adopted for MRI to ensure that the Oil Saturation in migration paths is accurately measured. The relevant spatial resolution of the mapping is defined according to the concept of REV (representative elementary volume). The Oil Saturation resulting from data obtained using different image formats are compared and the resulting Saturation evaluation is compared to direct bulk Saturation measurements. This comparison demonstrates that the calculated MRI Oil Saturation using DICOM image format is quite accurate, with a relative error less than 2%. (C) 2012 Elsevier B.V. All rights reserved.
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quantitative estimates of Oil losses during migration part ii measurement of the residual Oil Saturation in migration pathways
Journal of Petroleum Geology, 2008Co-Authors: B. Zhou, W. Wang, Guy VasseurAbstract:Recent experimental observations have demonstrated that losses of Oil in a secondary migration pathway depend largely on the characteristics of the pathway itself. Accurate assessments of the residual Saturation are required to quantify losses during migration. In the present paper, the authors report on experimental procedures designed to evaluate the Oil Saturation at various stages of the migration/invasion process. The experiments made use of both apparatuses filled with an artificial medium composed of glass beads, and cores composed of reservoir sandstones from Oilfields in NE China. The Saturation of residual Oil in the pathways was measured by nuclear magnetic resonance imaging. Experiment results show that mobile Oil continues to migrate in a porous medium when the supply of Oil has been stopped, but that the migration pathway shrinks and may become disconnected into isolated segments. Once active migration ceases, the residual Oil Saturation varies significantly from location to location within a pathway, and the average residual Oil Saturation falls to 30∼60%, depending on grain size and composition. A porous medium composed of large grains commonly contains large pores and pore throats and thus may correlate with low residual Oil Saturations.
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EXPERIMENTAL VERIFICATION OF Oil Saturation AND LOSSES DURING SECONDARY MIGRATION
Journal of Petroleum Geology, 2004Co-Authors: F. Q. Zhang, S. Miao, W. Wang, Y. Huang, B. Zhou, D. Loggia, Guy VasseurAbstract:Accurate estimates of losses occurring during secondary petroleum migration are of vital importance for valid petroleum systems assessments. In this paper, we discuss the development of migration pathways and the corresponding hydrocarbon losses using data from laboratory experiments based on diphasic immiscible draining processes. These experiments permitted us to study the formation of migration pathways, the distribution of non-wetting Oil along these pathways, and the re-utilization of existing pathways by later pulses of migrating Oil. The configuration of a migration pathway can be characterized by a phase diagram whose coordinates are two dimensionless numbers: the capillary number and the Bond number (a measure of the buoyancy force). NMR imaging was used to measure the Saturation of residual Oil within the pathways. It was found that, after migration, the average residual Oil Saturation within a pathway was generally less than 40% at a resolution of 0.4mm. Hydrocarbon losses during migration were estimated as the product of the volumetric proportion of the migrating cluster structure, defined using this spatial resolution, multiplied by the average residual Oil Saturation in the pathway.
Ming Wu - One of the best experts on this subject based on the ideXlab platform.
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diagenesis and elemental geochemistry under varying reservoir Oil Saturation in the junggar basin of nw china implication for differentiating hydrocarbon bearing horizons
Geofluids, 2015Co-Authors: Weisheng Hu, Xulong Wang, Yong Tang, Baoli Xiang, Ming WuAbstract:In this paper, we attempt to differentiate hydrocarbon-bearing reservoir horizons of the Junggar Basin of NW China based on the characteristics of diagenesis and associated elemental geochemistry. Reservoirs at this site have varying levels of Oil Saturation that correlate with the degree of dissolution in minerals (e.g., calcite and feldspar). Four different horizons with varying diagenetic mineral assemblages were observed, including (i) kaolinite-rich, Oil-dominated horizons, (ii) kaolinite–pyrite–hematite-rich, Oil–water-dominated horizons, (iii) siderite–chlorite-rich, water-dominated horizons, and (iv) chlorite-rich horizons with negligible hydrocarbon production. The mean MnO content of the representative diagenetic mineral (e.g., calcite) in each of the above horizons is >2.5, 2.0–2.5, 1.5–2.0, and <1.0 wt%, respectively. We propose that the above methodology can be used for the identification of reservoir hydrocarbon-bearing horizons. We argue that the indicators presented here can be applied in Oil exploration across the Junggar Basin.
Yuanyuan Yang - One of the best experts on this subject based on the ideXlab platform.
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origin and mechanism of the formation of the low Oil Saturation moxizhuang field junggar basin china implication for petroleum exploration in basins having complex histories
AAPG Bulletin, 2011Co-Authors: Zhihuan Zhang, Yuanchun Zhang, Yuanyuan YangAbstract:The Moxizhuang field is a small Oil field in the central Junggar Basin containing several low-Saturation, low-resistivity Oil reservoirs, which display a complex correlation between Oil Saturation and porosity and permeability that is atypical of both the filled and drained reservoirs. Biomarker associations of crude Oil and grains containing Oil inclusions (GOIs) of both the present-day water-bearing zones (water zones) and the Oil- and water-bearing zones (low-Oil-Saturation pay zones) were analyzed to investigate the mechanisms for the formation of the low-Saturation, low-resistivity Oil accumulations. The biomarker assemblage and hierarchical cluster analysis indicate that Oil in the Moxizhuang field was mostly generated from Permian source rock deposited in brackish to hypersaline anoxic environments. The pay zones and several water zones display GOI values as much as 38%, greater than the generally accepted threshold GOI value for an Oil column (5%). These GOI values are similar to those for high-Saturation Oil reservoirs in the Bohai Bay Basin and Oil zone samples from Australian basins, suggesting that both pay zones and water zones were high-Saturation Oil reservoirs in the geologic past. Geologic history analysis shows that the Moxizhuang field was located on the north wing of a paleoanticline during Oil charge in the Late Cretaceous to Paleogene. This anticline has gradually evolved into a south-dipping monocline since the Neogene, causing northward remigration of accumulated Oil. Differential lateral leakage of accumulated Oil in different sandstone layers during the remigration phase led to the formation of the water zones with high GOI values (completely drained reservoirs) and the low-Saturation, low-resistivity pay zones (partially preserved reservoirs) and caused the complex correlation between Oil Saturation and porosity and permeability. Compared with other postaccumulation physicochemical alteration processes, lateral leakage has rarely been recognized. Recognizing differential lateral leakage of accumulated petroleum with the existence of high-quality unfaulted cap rocks has important implication for petroleum exploration in sedimentary basins having complex evolution histories.
Berna Hascakir - One of the best experts on this subject based on the ideXlab platform.
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the residual Oil Saturation determination for steam assisted gravity drainage sagd and solvent sagd
Fuel, 2016Co-Authors: Cesar Ovalles, Estrella Rogel, Janie Vien, Berna HascakirAbstract:Abstract The residual Oil Saturation determination is critical for the performance evaluation of any Enhance Oil Recovery (EOR) methods. The existing residual Oil Saturation determination methods are mainly based on solvent extraction. However, because the quality of the extracted residual Oil and the remaining spent rock samples have not been examined before, this study investigates the accuracy of two commonly used solvent extraction methods for the residual Oil Saturation determination extracted from the spent rock samples of Steam Assisted Gravity Drainage (SAGD) and Solvent-SAGD. The results of the commonly used solvent extraction methods were compared with a new thermal method. It has been found that the thermal method provides more accurate results than solvent extraction method because the reservoir clays interact with residual Oil and solvent methods cannot successfully separate the residual Oil from reservoir rock. Therefore, a significant amount of clay is detected in the extracted residual Oil through solvent extraction. Moreover, this study reveals that among the saturates, aromatics, resins, and asphaltenes fractions of residual Oil, the aromatics fraction is responsible for the clay–asphaltene interaction and the resins content reduces this interaction. Because the solvents used to separate residual Oil from rock samples are in general strong aromatic solvents, the existing solvent extraction methods fail to determine the residual Oil Saturation amount accurately.
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laboratory screening tests on the effect of initial Oil Saturation for the dynamic control of in situ combustion
Fuel Processing Technology, 2015Co-Authors: Denis Aleksandrov, Berna HascakirAbstract:Abstract There are two main goals of this study: to investigate the performance variations of in-situ combustion (ISC) with the change in initial Oil Saturation (IOS) through laboratory screening tests and to determine mechanisms for maintaining the dynamic control of ISC by varying the injected air rate in an Oil field which has heterogeneously distributed IOS. Thus, we start with the determination of the optimum IOS value for ISC with five combustion tube tests at identical experimental conditions but at different IOS values and the IOS value used in the best performing experiment is decided to be the optimum IOS value for the given experimental conditions. Then, the air-requirement for the field-scale application is calculated analytically. The air-requirements for the experiments which exhibit poorer performance are normalized according to the value obtained for the optimum IOS case. We observed that the fuel-deposition amount is highly affected by the IOS and decreases with IOS. Our findings show that the constant air rate used in the experiments is responsible for the performance change in ISC for varying IOS. Therefore, the air rate should be adjusted according to the estimated fuel deposition amount for the dynamic control of ISC for the field application.
Hanxu Yang - One of the best experts on this subject based on the ideXlab platform.
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investigation of Oil Saturation development behind spontaneous imbibition front using nuclear magnetic resonance t2
Energy & Fuels, 2017Co-Authors: Bin Liang, Hanqiao Jiang, Junjian Li, Changcheng Gong, Ruyi Jiang, Shiyuan Qu, Hanxu YangAbstract:Spontaneous imbibition is a critical mechanism for the development of water-wet fractured reservoirs. In order to improve the ultimate Oil recovery, it is important to understand the change of in situ Oil Saturation during the spontaneous imbibition process. In this study, spontaneous imbibition experiments of two ends open (TEO) are conducted using unconsolidated sand packs. The sand packs are filled with quartz sands of three different particle sizes respectively and are fully Oil-saturated. Nuclear magnetic resonance (NMR) T2 is used to monitor the Saturation development behind spontaneous imbibition front. For porous media of the same lithology, the imbibition speed and final Oil recovery decline with the reduction of average pore size. As the imbibition front constantly moves forward, the change of Oil Saturation behind the imbibition front does exist, and the major decrease of Oil Saturation happens in the large pore space. In terms of a particular region behind the spontaneous imbibition front, wit...
