Formation evaluation of carbonate rocks sciencedirect. Pdf the wells of this study have produced from two stacked carbonate reservoirs which are characterized by variation in interparticle porosity. The chance of success of a hydrocarbon prospect is dependent on the water saturation, while the most critical parameter in geothermal exploration is the transmissivity. Petrophysical evaluation of uzek well using well log and core. Applications of the lucia method in carbonate petrophysics. As a member of production teams, he provided characterization of most reservoir types across the major basins of the globe. Carbonate reservoir evaluation has been a high priority for researchers and oil and gas producers for decades, but the challenges presented by these highly heterogeneous rocks seem to be neverending.
A case study from the longgang area, sichuan basin, china deng shaogui 1 2 3 wang yang 0 1 2 hu yunyun 1 2 ge xinmin 1 2 he xuquan 2 0 china petroleum great wall drilling geological research institute, liaoning 124000, china 1 school of geosciences, china university of petroleum. The result of the evaluation was utilized to investigate the low productivity from some zones and its relation with depositional process and petrophysical properties. Petrophysical evaluation of a gas carbonates reservoir through integrated workflow. A new workflow for petrophysical and textural evaluation. Petrophysical well log analysis for hydrocarbon exploration. Fracture evaluation is one of the core tasks in tight carbonate reservoir evaluation lamarche et al, 2012. Petrophysical evaluation helps reduce uncertainty and manage risk throughout the life of a reservoir. Proceedings, thirtysecond workshop on geothermal reservoir engineering stanford university, stanford, california, january 2224, 2007 sgptr183 petrophysical characterization of carbonate naturally fractured reservoirs for use in dual porosity simulators. Petrophysical rock classification in the cotton valley tight. Minerals that are of significant amount are quartz, carbonate and illite. Pdf a specific approach to petrophysical evaluation in a complex. Petrophysical evaluation and determination of rock types in a. Porosity is a basic petrophysical measurement, usually obtained from well logs.
Advanced formation evaluation for reservoir petrophysical model evaluation modern approaches and techniques in petrophysics. Formation evaluation of an unconventional shale reservoir. The petrophysical parameters pd, sm and cfactor adequately describe a curve and provide a good basis for pore system classification and determination of rock types. Thus, it is not always possible to make a predictive rock property model of a carbonate reservoir that is allied to the lithofacies model as in the example above. Petrophysical evaluation of uzek well using well log and. A case study from the longgang area, sichuan basin, china. Pdf petrophysical evaluation of a carbonate reservoir in.
Jerry lucia accurate determinations of petrophysical properties in carbonate reservoirs i. Carbonate reservoir evaluation has been a high priority for researchers and oil. Calculation of petrophysical properties for mishrif carbonate reservoir. Porosity and permeability analysis from well logs and core in. Reservoir evaluation plays a major role in the exploration of geothermal reservoirs. The petrophysical characteristics of sixty cores of 7 producing carbonated oil reservoirs were evaluated in laboratory varying the confinement pressure.
Petrophysical evaluation of a severely heterogeneous. The principal goal of reservoir characterization is to construct threedimensional images of petrophysical properties. The m exponent in carbonate petrophysics r e gene ballay, phd. Rock physicsbased carbonate reservoir pore type evaluation. Integrated petrophysical log characterization for tight carbonate. Petrophysical evaluation of reservoir sand bodies is the continuing process of integrating and interpreting geological, geophysical, petrophysical, fluid and performance data to form a unified, consistent description of reservoir properties throughout the field.
New evaluation techniques for gas shale reservoirs rick lewis, david ingraham, marc pearcy. Multiwell bases study using multiwell database, key well study, data normalization. Then, the estimated porosity was compared and validated with other petrophysical logs i. Five day carbonate petrophysics the lucia system recognizes that if one is to characterize the relationship between rock fabric and petrophysical parameters, thenrock fabric and petrophysical parameters, then the pore space must be classifiedthe pore space must be classified as itas it exists today, in terms of petrophysical properties. Identify petrophysical parameters evaluation from core and log data knowledge on log quality control on tool measurements log readings and data handling practice application on carbonate reservoir examples learn quick look interpretation using advanced methods and crossplots. A specific approach to petrophysical evaluation in a complex. An innovative integrated petrophysical evaluation has been conducted for reservoir characterization. Carbonate petrophysics course objective integrate across discipline and scale and timeframes wireline and lwd measurements are typically the basis for fi ld d l t d d l tifield development and depletion ultimate objective is an integrated calibrated interpretation of that dataof that data wellbore trajectory and reservoir boundaries. This procedure tested on several key wells with and without core measurements and welltesting measurements.
Author links open overlay panel ali rajabi mohammad. Two carbonate reservoirs with different reservoir features, one is a shallow carbonate reservoir with average high porosity 10% and another one is a supperdeep carbonate reservoir with average low porosity carbonate reservoir pore structure. Petrophysical rock classification in the cotton valley tightgas sandstone reservoir with a clustering poresystem orthogonality matrix chicheng xu1 and carlos torresverdin2 abstract petrophysical rock classification is an important component of the interpretation of core data and well logs acquired in complexreservoirs. Includes practical exercises case studies and sharing. Petrophysical characterization of carbonate formations for.
Petrophysics and rock physics of carbonate reservoirs. Petrophysics in geothermal exploration in the netherlands click for pdf. Reservoir petrophysics university of texas at austin. Integrated formation evaluation in clastic and carbonate. The app is linked to a 30,000 core plug petrophysical database, petrodb and its functionality is invoked using using reservoir types and reservoir rock types. Rockfabric, petrophysical parameters, and classification. Later, lucia got together with an engineer and published a paper using the lucia concept to develop a method to calculate irreducible water saturation swirr of a carbonate reservoir using only porosity and crystal or grain size jennings and lucia, 2003. Rock physicsbased carbonate reservoir pore type evaluation by combining geological, petrophysical and seismic data.
Carbonate reservoir characterization, flow unit, derdere formation. Jul 28, 2017 petrophysical evaluation of well log data has always been crucial for identification and assessment of hydrocarbon bearing zones. A comprehensive deterministic petrophysical analysis procedure for reservoir characterization. The initial evaluation is based on traditional logging tools such as gamma ray gr, resistivity logs, density, neutron and sonic. Abstract the wells of this study have produced from two stacked carbonate reservoirs which are characterized by variation in interparticle porosity along with a variable secondary porosity system of dissolution from vugs and fractures. Petrophysical evaluation and determination of rock types in a carbonate reservoir in sw iran with interpretation of petrography and geophysical well logs beiranvand, b. Spectral gamma ray was introduced in this study as a new method to identify the reservoir. In heterogeneous reservoirs with variable rock composition and petrophysical properties, integration of core measurements and well logs is necessary to predict petrophysical properties in zones with no or rare core samples. Improvement of petrophysical evaluation in a gas bearing carbonate reservoir a case in persian gulf. Improvement of petrophysical evaluation in a gas bearing. A specific approach to petrophysical evaluation in a. In carbonate formations, various attributes can be used to distinguish rock types, such as lithology, poresize distribution, fractures, vugs, microporosity, and nonconnected pore space. Petrophysical characterization and fractal analysis of carbonate. Archie ge 1952 classification of carbonate reservoir rocks and petrophysical considerations.
Received november integrated petrophysical log characterization for tight carbonate reservoir effectiveness. Pdf a specific approach to petrophysical evaluation in a. To improve the evaluation of a carbonate gas reservoir. A new workflow for petrophysical and textural evaluation of carbonate reservoirs. Accurate petrophysical evaluation requires the integration of texturesensitive logs such as nuclear magnetic resonance, boreho. Carbonate reservoirs, limestone and dolomite in the main, are very much more difficult to analyse petrophysically than clastic rocks because of the more complex pore structures and. Different real examples from different parts of the world will be used throughout the course to help the attendees understanding the reservoir characterization concept and the integrated analysis in either clastic or carbonate reservoirs. Carbonate sediments can be deposited in many geological environments. A substantial portion of his career has been devoted to technology development and delivery in the areas of reservoir petrophysics, seismic reservoir characterization, and subsurface integration. Then, the estimated porosity was compared and validated with petrophysical logs other i. Unlimited viewing of the articlechapter pdf and any associated supplements and figures. Hydrocarbon fluid identification, porosity characterization, saturation estimations, and permeability are necessary input data for robust resource estimates.
Well log is one of the most fundamental methods for reservoir characterization, in oil and gas industry, it is an essential method for geoscientist to acquire more knowledge about the condition below the surface by using physical properties of rocks. Such model requires finescale data such as porosity and permeability that should be accurately used in the model. Petrophysical evaluation and determination of rock types. In support of these efforts, geoscientists are trying to decipher the enigma of carbonate rocks complex pore space and understand how permeability barriers and conduits affect reservoir behavior. Abstract an appraisal well was drilled to assess the potential of gas bearing carbonate formations. Petrophysical evaluation of a gas carbonates reservoir. This book presents selected articles from the workshop on challenges in petrophysical evaluation and rock physics modeling of carbonate reservoirs held at iit bombay in november 2017 and discusses the recent advances in the area of research and development of carbonate reservoir characterization. Petrophysical properties evaluation of tight gas sand reservoirs using nmr and conventional openhole logs. A specific approach to petrophysical evaluation in a complex carbonate reservoir. A comprehensive deterministic petrophysical analysis. In this work, we analyzed geological, geophysical, and petrophysical data sets for two wells to assess the carbonate reservoir of field a in campos basin southeastern brazil.
The participants will gain extensive knowledge for the advanced formation evaluation techniques. Petrophysics of unconventional reservoirs training course. One principal need in petroleum recovery from carbonate reservoirs is the description of the threedimensional distribution of petrophysical properties in order to improve performance predictions. This article tracks the interpretation process, from carbonate rock description and petrophysical log evaluation. Petrophysical characterization and fractal analysis of. Spe 159991 rock classification in carbonate reservoirs. Integrated petrophysical log characterization for tight. The first three tracks show the data from a triplecombo logging suite. Carbonate reservoir evaluation petrophysics wiley online. Final estimates of porosity and permeability are in good agreement with the properties of the global petrophysical system been founded. Southeastern brazil, to assess the carbonate reservoirs physical properties. The petrophysical objectives were to determine porosity, permeability, fluid type and saturation. Research institute of petroleum industrynioc received.
This variation is reflected in the fabric, structure, texture and flow behaviour of the reservoir rock. Based on the box counting method, the fractal dimension of the samples was calculated. Genevieve limestone, hopkins county, kentucky, and its implications for formation evaluation. An evaluation of porosity data has been done in a gas reservoir dalankangan formations in southern iran, using the fmi image log. The challenges for carbonate petrophysics in petroleum. Contrary to sandstones, the pore size distribution in carbonates is bimodal.
Many carbonate reservoirs are characterized by rock types instead of lithofacies. In 1952 archie stated in discussing the petrophysics of limestones, it is necessary to first classify them in a manner to portray as much as possible the essential pore characteristics of a reservoir. To analyze the type of porositypermeability transforms, the porosity types and their spatial distribution as a first phase of the petrophysical characterization. Here, a combination of lithofacies and diagenesis acts as a control on rock properties. Practice application on carbonate reservoir examples will be us ed as workshop training for quick look interpretation. Carbonate reservoirs, limestone and dolomite in the main, are very much more difficult to analyse petrophysically than clastic rocks because of the more complex pore structures and networks commonly.
Using core data, reservoir quality index rqi bins have been imposed over porositypermeability crossplots to define the reservoir rock types, rrts, in this carbonate reservoir. An evaluation of porosity data has been done in a gas reservoir dalankangan formations in southern iran using the fmi image log. Carbonate reservoir evaluation petrophysics wiley online library. The petrophysical properties of kerogen are listed in table 1. Carbonate reservoirs, limestone and dolomite in the main, are very much more difficult. Niger delta, reservoirs, characterization, hydrocarbon and saturation. Advanced and integrated petrophysical evaluation for. Formation evaluation can be generally defined as the practice of determining the physical properties of rocks and the fluids that they contain. Spe 159991 rock classification in carbonate reservoirs based. Application of dsi log in geomechanical and petrophysical evaluation of carbonate reservoirs. Intermediatehigh production reservoirs for a than 5 tons or daily gas production is.
Petrophysical properties of the upper qamchuqa carbonate reservoir through well log evaluation in the khabbaz oilfield. Petrophysical evaluation of well log data and rock physics. Summary carbonate reservoirs, limestone and dolomite in the main, are very much more difficult to analyse petrophysically than clastic rocks. Improvement of petrophysical evaluation in a gas bearing carbonate reservoira case in persian gulf. Introduction carbonate reservoirs have complex pore systems, which presents. Formation reservoir solutions frs petrophysics halliburton. The narrow porouspermeable layers can be detectable by integration. Related petrophysical factors like wettability and relative permeability also often describe the fundamental quality of a carbonate reservoir in dissimilar ways than a clastic reservoir with large implications for hydrocarbon recovery efficiencies under various types of. In addition to petrophysical evaluation, lithology assessment. Well log analysis for reservoir characterization aapg wiki. Pdf in this work, we analyzed geological, geophysical, and petrophysical data sets for two wells to assess the carbonate reservoir of field a. The course serves as an introduction on how to do a thorough, modern petrophysical evaluation systematically and on.
Pdf petrophysical properties evaluation of tight gas. In present paper, petrophysical evaluation of well log data from cluster of six wells in the study area is carried out in combination with rock physics modeling for qualitative and quantitative characterization of eocene reservoir in chandmari oil field of assam. Integrated formation evaluation in clastic and carbonate reservoirs an intensive 5 day training course 22 26 nov 2020, dubai 24nov19 this course is designed, developed, and will be delivered under. Significant digenetic processes such as dolomitization, chemical dissolution, reprecipitation, fracturing,etc. This article tracks the interpretation process, from carbonate rock description and petrophysical log evaluation to new techniques for. The unique pore characteristics and variation in mineral composition of carbonate rocks dolomite, dolomitic limestone, calcitic dolomite, limestone, etc. Permeability estimation of fractured and vuggy carbonate. Petrophysical characterization of carbonates of campos basin in.
They are also used to formulate a strategy for reservoir development. Petrophysical properties of the upper qamchuqa carbonate. Pdf improvement of petrophysical evaluation in a gas. This paper presents existing methods in evaluation of a gas bearing carbonate reservoir in persian gulf and tries to improve the evaluation using new logs. Geometric description of the curve or cfactor is a measure of the pore sorting measured by micpm. They will be fully capable of running advanced petrophysical workflows, nmr interpretation, saturation height modeling, and facies and permeability modeling. Schlumberger carbonate advisor interpretation methodology integrates multiple inputs within sequential steps. Pdf petrophysical evaluation of a carbonate reservoir in campos. Electric imaging logging cannot only directly show the.1670 305 947 560 1116 1290 244 26 915 275 435 284 634 1644 690 317 1470 261 413 853 1532 461 555 424 1069 495 210 1006 1315 337 1144