Reservoir characterization for naturally fractured reservoirs. Geologic analysis of naturally fractured reservoirs 2nd edition. Calculate porosity partitioning coefficient of a naturally fractured reservoir calculate storage capacity and interporosity flow factor analyze well tests in naturally fractured reservoirs assess reservoir performance of horizontal wells in nfr use mbe to analyze impact of pressure depletion on recovery dr. The following diagrams and points are based on an example from the central. Fracture porosity of naturally fractured reservoirs onepetro. Geometric nature of hydraulic fracture propagation in. Core description in the authors experience, based on a number of studies in western canada, there is a typical core permeability vs.
Naturally fractured reservoirs aguilera, roberto on. Hydraulic fracturing, paper spe 38622, presented at. Purchase geologic analysis of naturally fractured reservoirs 2nd edition. Purchase well test analysis for fractured reservoir evaluation, volume 27 1st edition. Not only do the intrinsic characteristics of the fractures, as well as the matrix, have to be characterized, but the interaction between matrix and. Reservoir characterization of fractured reservoirs in western. The laboratory measurement of m for a wellfractured rock is seldom successful, so there is not much real data to use, except in competent samples with minor microfractures. However, due to transit disruptions in some geographies, deliveries may be delayed. Although many fractured reservoirs could be developed economically, it is very common to see. For naturally fractured reservoirs with a vertical fracture, the pressure behavior of wells crossed by a uniform flux and infinite. Crains petrophysical handbook fractured reservoir basics. It allows geologists and reservoir engineers to pragmatically understand the impact of fractures and their associated uncertainties. Enhanced oil recovery in fractured reservoirs request pdf.
Get pdf abstract an idealized model has been developed for the purpose of studying the characteristic behavior of a permeable medium which contains regions which contribute significantly to the pore volume of the system hut contribute negligibly to the flow capacity. Abstract due to complexity associated to petrophysical characterization of the porosity in naturally fractured reservoirs, a methodology to discretize it in four main systems was developed. Although both the presence of fractures and the presence of a reservoir can be determined from logs, a production test will be needed to determine whether economic production. Download fulltext pdf fractured reservoirs in the eastern foothills, colombia, and their relationship with fold kinematics article pdf available in aapg bulletin 9908. The challenge of estimating recovery from naturally fractured. Naturally fractured reservoirs present a production paradox. Oil recovery in fractured reservoirs arne graue, robert w. Ferno, 2012, and the conductive fracture system usually leads to rapidly. All petroleum reservoirs contain natural or manmade fractures. Characterization of naturally fractured reservoirs.
Wayne narr is a structural geologist with interest in characterization and modeling of naturally fractured reservoirs. Jan 28, 2016 classification of fractured carbonate reservoirs 1. Naturally fractured reservoirs research papers academia. The fractures serve as highly conductive flow paths for the reservoir fluid, increasing the reservoirs effective permeability significantly over that attributable to the rock matrix. Naturally fractured reservoirs training course petroskills fr. Reservoir characterization and simulation modeling of naturally fractured reservoirs nfrs presents unique challenges that differentiate it from conventional, single porosity continuum reservoirs. Abstract this paper treats a dual porosity and dual permeability system in which two grids one each for the fractures and matrix occupy the same volume. We employ 5 pseudo components in the formulation which extends the capability beyond normal bl. Field description k oil field is an iraqi oil field located in the north of iraq. The 8 fractured gas reservoirs have an average ultimate recovery factor of 61%.
Nelson 1 identifies four types of naturally fractured reservoirs. Naturally fractured reservoirs have been classified according to the relative contribution of the matrix and fractures to the total fluid production. Storativity and interporosity flow parameters, and c. The fractures serve as highly conductive flow paths for the reservoir fluid, increasing the reservoir s effective permeability significantly over that attributable to the rock matrix. Characterization of fracture networks is a pragmatic process that relies heavily on experience and empiricism and very little to. This workshop will contrast challenges, techniques, methods and technologies applied in fractured carbonate reservoirs, with special attention to the e. Two thirds of the oil reservoirs have recovery factors 20%, which is certainly high enough to be commercially attractive. In the past halfcentury, the study of fluid flow and transport processes in fractured porous media has received great attention and has. Geologic analysis of naturally fractured reservoirs nelson, ronald on. Simulations of naturally fractured reservoirs onepetro. This course covers geologic and engineering concepts, methodology, and technology used to characterize, evaluate, and manage naturally fractured reservoirs. Purchase fundamentals of fractured reservoir engineering, volume 12 1st edition.
Discretization and gridding in reservoir simulation 2. These include quantification in reservoir descriptions, interpretive evaluation of production history or history matching, reservoir modeling to understand the scaling of various geological and engineering data. Naturally fractured reservoir characterization date. It is written for students, reservoir geologists, log. Numerical simulation of fractured reservoirs youtube. When evaluating a fractured reservoir, the analyst must follow these steps determine the origin of the fracture system found or the type of fracture system that is being explored for based on geometric characteristics of the fractures, their distribution in three dimensions, and empirical models of fracture system genesis. Geologic analysis of naturally fractured reservoirs. Pdf characterization of naturally fractured reservoirs. Pdf fractured reservoirs in the eastern foothills, colombia. Natural fractured reservoir engineering phdg textbooks in preparation, intended to be issued during 2015. Get pdf abstract an idealized model has been developed for the purpose of studying the characteristic behavior of a permeable medium which contains regions which contribute significantly to the pore volume of the system hut contribute negligibly to the flow.
Naturally fractured reservoirs may contain many fractures that permeate different regions of the reservoir, occurring with greater intensity near faults or folds. Students of the following universities can ask for free copies for personal use. Prediction of naturally fractured reservoir performance using. The focus is on understanding fractures in a reservoir how to determine whether fractures are important to hydrocarbon producibility, and if so. Fundamentals of fractured reservoir engineering, volume 12 1st. Moe and thomas bogno department of physics, university of bergen, norway abstract visualization of the effects of various wettability conditions on oil recovery in fractured reservoirs is demonstrated in twodimensional insitu imaging experiments in large blocks of. Controls on recovery factor in fractured reservoirs.
Naturally fractured reservoir characterization seeks to confront many of these challenges by providing an introduction to the engineering and geological character of naturally fractured reservoirs. The high permeabilities of the fractures effectively short circuits the matrix blocks, making it difficult to establish sufficiently high pressure gradients to allow effective viscous displacement of the oil in the matrix a new important effect comes into play imbibition. Maximizing economic recovery from naturally fractured reservoirs is a complex process. Naturally fractured reservoir characterization digital edition. This publication deals exclusively with naturally fractured reservoirs, and includes many subjects usually treated in separate volumes. Natural fractures result from the interaction of earth stresses while manmade fractures result from drilling activities, increase in pore pressure in injection operations, reservoir cooling during water flooding, redistribution of earth stresses in the field as a result of injection and.
The geometry of hydraulic fracture propagation in the absence and presence of natural fractures in reservoirs was studied. Fundamentals of fractured reservoir engineering 1st edition isbn. The behavior of naturally fractured reservoirs onepetro. In reasonable nonfractured reservoirs, it is usually possible to estimate permeability, and hence productivity, but this is not always possible in fractured reservoirs. In reasonable non fractured reservoirs, it is usually possible to estimate permeability, and hence productivity, but this is not always possible in fractured reservoirs. In reserv oirs with a contin uous netw ork of faults andor fractures, assuming some. Naturally fractured reservoirs are very heterogeneous in terms of porosity and permeability chillenger and yen, 1983. Well test analysis for fractured reservoir evaluation, volume 27. Analysis of pressure transient tests in naturally fractured reservoirs. Fractured reservoirs also tend to have higher anisotropy, which is seen as large variation in k90 vs. Geomechanical response of fractured reservoirs csic. Field examples and case studies demonstrate the importance of integrated geologic and. Three dimensional modelling of fractured and faulted reservoirs.
This course covers geologic concepts, methodology, and technology used to characterize, evaluate, and manage naturallyfractured reservoirs. In type 1 reservoirs, fractures provide the essential reservoir storage capacity and permeability. View naturally fractured reservoirs research papers on academia. Fundamentals of fractured reservoir engineering, volume 12. It requires a thorough understanding of matrix flow characteristics, fracture network connectivity and fracture matrix interaction. For these reservoir characteristics it is difficult to place a reasonable certainty of volumetric estimates of original hydrocarbonsinplace and reserves. Yushu wu, in multiphase fluid flow in porous and fractured reservoirs, 2016. Get your kindle here, or download a free kindle reading app. This course covers geologic and engineering concepts, methodology, and technology used to characterize, evaluate, and manage naturallyfractured reservoirs. Next, we simulate injection of lowtemperature fluid into a fractured reservoir for a range of fracture permeability. Fracaflow is the only package available on the market to provide all the necessary tools to assess fractured reservoirs, from secondary porosity assessment to permeability computation. Applications and limitations of geologic procedures and tools are discussed. Typical type1 naturally fractured reservoirs are the amal field in libya, edison. The nature of naturally fractured reservoirs schlumberger.
The challenge of estimating recovery from naturally. Textbook series natural fractured reservoir engineering. In fractured reservoirs viscous displacement often fails. It is important to establish some basic criteria for recognizing when fractures are an important element in reservoir performance and to recognize the nature and performance characteristics of a naturally fractured reservoir. He held the title of senior research consultant for chevron energy technology company where he worked for 27 years on an array of international projects that included reservoir structural geology studies, consulting, technology development, training, and exploration. Most naturally fractured reservoirs i am familiar with are characterized by low matrix porosities less than 10% and low matrix permeabilities less than 1 md. Applications and limitations of geologic and engineering procedures and tools are discussed. The results revealed a marked influence of natural fractures on the symmetry of fracture propagation observed for rock free of natural fractures. Intermediateadvanced course objectives and description this course is designed for geologists, geophysicists and reservoir engineers who are part of. Students of th e following universities can ask for free copies for. Naturally fractured reservoirs are elusive systems to characterize and difficult to engineer and predict. Well production heterogeneity is a characteristic of most naturally fractured reservoirs.
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