Sequence stratigraphy analysis of unik field, onshore. Estimate sequences and systems tracts from the interpreted lithofacies using regional cross sections with well and outcrop data determine accommodation space changes from parasequence stacking. Recently the benefits of correlating use sequence stratigraphic principles have been highlighted in both siliciclastic and carbonate reservoirs. G sulzberger drilled two oil prospecting wells at bracknell op1 and hagley op2 in the north of the longford subbasin matthews 1983. Concepts for highresolution correlation of time and facies subject group. Sequence stratigraphy well log interpretations intro well log seq strat. You should combine the techniques outlined above with your. Stratigraphic interpretation of welllog data of the. These two wells provide the most complete stratigraphic section through the basin. Welllog sequence stratigraphy on the other hand, being an integral part of welllog seismic sequence stratigraphy allows the geoscientists to divide a rock section into series of genetic units bounded by condensed section and their associated maximum flooding surface using wire line log signatures nton.
Sequence stratigraphy american association of petroleum. Practical sequence stratigraphy was originally published as a fifteenpart series in the canadian society of petroleum geologists monthly magazine, the reservoir, between may 2008 and september 2009. Regional welllog crosssection of the almond formation in the washakie. You should combine this understanding of the regional geology with your. Sequence stratigraphy is a type of stratigraphy that deals with the description, interpretation, classification, and nomenclature of sedimentary rocks based on their stratal stacking patterns and.
A revised biostratigraphic and well log sequence stratigraphic framework for the scotian margin, offshore eastern canada 1,2. Prediction of reservoir continuity is currently a key question in. Use of well logs for sequence stratigraphic interpretation of the subsurface. Concepts for highresolution correlation of time and facies. Total petroleum systems and geologic assessment of undiscovered oil and gas resources in the san juan basin. The highdensity well log display shown in figure 4 is composed of gammaray, spontaneous potential and deep resistivity logs. Drilled well data could not be used in application of sequence stratigraphy in bengal basin as all offshore wells were. Towards the standardization of sequence stratigraphy. The seismic facies analysis of the study area was done by examining and interpreting different. Focus on geology to define subsurface migration pathways. Petrophysical analysis and sequence stratigraphy appraisal. The recurrence of the same types of sequence stratigraphic surface through geologic. The list below, modified from vail outlines a suggested procedure for well log sequence analysis interpret depositional lithofacies on logs using cores and cuttings to calibrate the log. The sparse core and well log control also exist on the bourbon arch.
Pdf files containing wells logs and a base map can viewed on electronic. Free web tutorials sequence stratigraphy, tutorials carbonate petrology, seismic. Along with his coauthors, he received the robert dott, sr. Concepts for highresolution correlation of time and facies methods in exploration series r. Pdf stratigraphic sequence, microfacies, and petroleum. Journal of sedimentary research, august 2006 octavian catuneanu has written a balanced, well illustrated and uptodate overview of the various approaches to sequence stratigraphy.
Pdf a revised biostratigraphic and welllog sequence. Sequence stratigraphy is a branch of geology that attempts to subdivide and link sedimentary deposits into unconformity bound units on a variety of scales and explain these stratigraphic units in terms of variations in sediment supply and variations in the rate of change in accommodation space relative sea level, the combination of eustatic sea level and tectonic subsidence. Innovative petrotech solutions, inc course delivery a combination of lectures, examples, handson classroom exercises through 5 days in a workshop format, each day including examples and exercises as described in the outline. Stratigraphic sequence, microfacies, and petroleum prospects of the yamama formation, lower cretaceous, southern iraq article pdf available in aapg bulletin 7711. Well log sequence stratigraphic correlation reveals that stratal packages within the. Borehole log borehole log toto graphic grainsize log graphic grainsize log. Stratal stacking patterns combine to define trends in geometric character that. Select multiple pdf files and merge them in seconds. Pdf two approaches to sequence stratigraphy researchgate. As well as many inhouse publications on stratigraphy and facies, he published aapg methods in exploration no. Siliciclastic sequence stratigraphy in well logs, cores, and outcrops.
Welllog seismic sequence stratigraphy course practical applications for prospect generation. Environmental sequence stratigraphy essenvironmental sequence stratigraphy ess process. The various forms of sequence stratigraphic analyses outlined include the use of seismic crosssections, well logs and outcrop studies of sedimentary rocks to infer changes of relative sea level and rates of sedimentation. The sequence stratigraphy of niger delta, delta field, offshore nigeria a thesis by. The following pages are focused on the use of well logs to build sequence s stratigraphic models of depositional system s. Application of sequencestratigraphic analysis depends on the recognition of a hierarchy of stratal units including beds, bedsets, parasequences, parasequence sets, and sequences bounded by chronostratigraphically significant surfaces of erosion, nondeposition, or their correlative surfaces. Sequence stratigraphic study promotes thorough understanding of the evolution of basins, but also allows for interpretations of potential source rocks and reservoir rocks in both frontier areas having seismic data but little well data and in more mature hydrocarbon provinces. The integration of outcrop, core, welllog and seismic data affords. Stewart abstract this paper presents the results of a wireline log study on the cantuar formation of the. Stratal stacking patterns combine to define trends in geometric character that include.
Sequence stratigraphy at university of alberta studyblue. Sequence stratigraphy and depositional sequence interpretation. The recurrence of the same types of sequence stratigraphic surface through geologic time defines. Sequence stratigraphic characterization of the baton rouge aquifer system, southeastern louisiana elizabeth l. Sequence stratigraphic characterization of the baton rouge. Paleogeographic reconstruction of facies belts at precise moments in time is the goal of the sequence stratigrapher. Despite such popularity, considerable confusion and various misconceptions are associated with the methods and terminology e.
Well log study and stratigraphic correlation of the. Wheelerlab is an interactive program that facilitates the interpretation of stratigraphic data seismic sections, outcrop data and well sections within a sequence stratigraphic framework and the subsequent transformation of the data into the chronostratigraphic domain. You will be shown how to construct chronostratigrapic diagrams and also be show how to predict facies geometries and build. Ashton embry for his work in making this series possible. Published online by the canadian society of petroleum. Sequence stratigraphy and sediment distribution pattern in. Sequence stratigraphy field trip applied stratigraphix.
Sequence stratigraphy subcommission on quaternary stratigraphy. Sequence stratigraphy is the study of rock relationships within a. Welllog cross sections are shown in red and seismic profiles fig. Well log sequence stratigraphic correlation reveals that stratal packages. Using interpreted digital welllogs and sequence stratigraphy to develop high resolution subsurface models 4 figure 3. Apparently, history tends to repeat itself, and during the. Siliciclastic sequence stratigraphy in well logs, cores. Welllog sequence stratigraphy applied stratigraphix. Neogene sequence stratigraphy, nam con son basin, offshore. Ppt sequence stratigraphy powerpoint presentation free.
Select aspects of sequence stratigraphic interpretationsequences. Stratigraphic correlation using well logs crewes research report volume 16 2004 1 well log study and stratigraphic correlation of the cantuar formation, southwestern saskatchewan shaohua li, charles m. Siliciclastic sequence stratigraphy in well logs, cores and outcrops. Concepts for highresolution correlation of time and facies articlechapter. This thesis entitled 3d seismic stratigraphy and reservoir characterization of the chalk group in. A knowledge of sequence stratigraphy concepts and procedures has the potential to signi. Benefits of chronocorrelation vs lithocorrelation were first presented by exxon geoscientists over 30 years ago and are now widely accepted. Certain surfaces are designated as sequence or systems tract boundaries to facilitate the construction of. The reason for choosing these is unlike the primarily horizontal strata of the book cliffs where one is almost always standing at the base of a cliff where all the. Principles of sequence stratigraphy developments in.
For this process well logs are primarily used to establish the grain size and the lithology of the penetrated sediment. The data sets used for this study comprises geophysical well logs gr, resistivity. This thesis investigates the possibilities for an automatic stratigraphic interpretation of an oil. A pdf file containing all wells and a basemap can printed. This online guide is primarily aimed at the application of sequence stratigraphy to outcrops. Principles of sequence stratigraphy is an uptodate and comprehensive textbook covering both theory and practice of sequence stratigraphy.
Subsurface sequence stratigraphic correlation using well logs. Sequence stratigraphy has revolutionized the way sedimentary rocks are subdivided, correlated and mapped. Subsurface well logs gamma and resistivity are used to construct a cross section based on sequence stratigraphic principles. Subsurface sequence stratigraphic correlation using well. Sequence stratigraphy emphasizes changes in stratal stacking patterns in response to varying accommodation and sediment supply through time. Examples of the gamma ray log motifs of the study area time information. In this assignment, students will learn how to correlate well logs applying basic concepts of sequence stratigraphy. Sequence boundaries may be recognized in well log, core, or. As a result, none of the examples deal with topics related specifically to cores, well logs, or most significantly, seismic. Most sequence stratigraphy trips are run in the book cliffs along the coloradoutah border, however our trip is run on outcrops that are well studied yet rarely frequented by others. Sequence stratigraphy material for this chapter are mainly from the following articles. Application of systems tracts with propagation of sequence. An evaluation of the nature of the controls on sequence development may be feasible in the case.
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