Ppt sequence stratigraphy powerpoint presentation free to. Facies analysis and sequence stratigraphic framework of upper. A sequence is defined as a succession of relatively conformable, genetically related strata bounded by an unconformity or its correlative conformity. Sequence stratigraphy of gachal formation in bakhshi section sequence stratigraphy is a method of classifying and interpreting sedimentary rocks and fossils in terms of variations in the environments. Sequence stratigraphy material for this chapter are mainly from the following articles. Different kind of systems tracts are assigned on the basis of stratal stacking pattern, position in a sequence and in the sea level curve and types of bounding surfaces. A free powerpoint ppt presentation displayed as a flash slide show on id. The aggradational to retrogradational stacking pattern of the hugin formation callovian e. An interruption in sedimentation discontinuity is commonly accompanied by a period of erosion that can cause a significant gap in the rock record unconformity. Systems tracts often have characteristic parasequence stacking patterns. Perkins research conference is entitled sequence stratigraphic models for exploration and production.
The application of ichnology, sedimentology and sequence. Petroleum system elements within the late cretaceous and early paleogene sediments of nigerias inland basins. Next, parasequences stacking pattern, unconformity surfaces, system tracts and the status of the studied sequence stratigraphy among the global sequences are also determined. Certain surfaces are designated as sequence or systems tract boundaries to facilitate the construction of. These stratigraphic parameters can influence coal gas content. Early studies treated degradational as a type of progradational stacking, but many workers now recognize it as distinct. Sequence i 11,1009,400 ft in this sequence, the lst 11,10010,600 ft is made up of progradational stacking pattern of sand. The sequence stratigraphic concept and the precambrian rock. Parasequences that show such trends are called parasequence sets. Pdf petroleum system elements within the late cretaceous. Sequence stratigraphy of akos field in the coastal swamp. Sequence stratigraphy analysis of unik field, onshore. The aggradational to retrogradational stacking pattern of the. Sequencestratigraphic analysis of the rollins and the.
Carbonate sequence stratigraphy although most of this website focuses on shallowmarine siliciclastic systems, sequence analysis can be just as readily applied to carbonate systems. In most cases, there will not be simply one parasequence by itself, but there will be a series of parasequences. The retrogradational stacking pattern of parasequence sets suggests an increase in relative sea level during deposition. Lithology and facies stacking pattern were interpreted from the gamma ray and resistivity logs. The parasequence stacking pattern in parasequence sets can be a progradational, retrogradational, or aggradational pattern, which depends on the ratio of the deposition rate and ac. 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. Facies interpretation, depositional environment and sequence. Fluvial sequence stratigraphic analysis of oligomiocene. Therefore, sequence stratigraphy techniques involve. Translating sequence stratigraphic principles originally defined for seis mic scale siliciclastic systems. Applying sequence stratigraphy to outcrops typically follows from the smallestscale interpretations to the largest. Characteristic sedimentary wedge with specific geometry and vertical stacking pattern.
The staking pattern is defined as aggradational within this sequence. With continued rapid rise in relative sea level, each successive coastalplain progradational succession shifts landward, forming a retrogradational stratal stacking pattern fig. Consists of succession of genetically related strata deposited during a single cycle of relative sea level change. 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. Facies analysis and sequence stratigraphic framework of upper campanian strata neslen and mount garfield formations, bluecastle tongue of the castlegate sandstone, and mancos shale, eastern book cliffs, colorado and utah by mark a. Outcropand corebased studies are aimed at recognizing features at these scales, and represent the basis for highresolution sequence stratigraphy. Translating sequence stratigraphic principles originally defined for seis micscale siliciclastic systems. Eriksson b adepartment of geology, rhodes university, grahamstown 6140, south africa bdepartment of geology, university of pretoria, pretoria 0002, south africa. Retrogradational stacking results when the longterm rate of accommodation exceeds the longterm rate of sedimentation.
Sequence stratigraphy of lower carboniferous rocks in. The highresolution sequence stratigraphy tackles scales of observation that typically fall below the resolution of seismic exploration methods, commonly referred to as of 4thorder or lower rank. A sequence stratigraphic analysis of depositional systems in the alpha field located at the eastern coastal swamp depobelt of the niger delta was carried out using well logs, seismic and. Sequence stratigraphy is the study of sedimentation patterns and facies relationships within a chronostratigraphic. Sequence stratigraphy emphasizes changes in stratal stacking patterns in response to varying. Sequence stratigraphic units in parentheses may occur at more than one frequency. Sequence stratigraphy implications for reservoir development in the. Note, however, that sequence stratigraphic interpretation places the dieneriansmithian sb at or near the top of the lower lowstandslope onlap wedge, so that all or most of that wedge fig. Jan 30, 2017 sequence stratigraphy has geological time significance, when compared to lithostratigraphy which correlates similar rock type only on the bases of lithology often irrespective of the depositional environments. Highfrequency sequences and their stacking patterns. The variation in the weather and sea level can be detected through careful analysis of sequence stratigraphy 43. Pdf sequence stratigraphy hierarchy and the accommodation.
Sequence stratigraphy is the subdivision of the stratigraphic record on the basis of bounding discontinuities. Although sequence stratigraphy was originally designed for seismic sections, sequence principles can be readily applied to outcrop, core, and well logs. This relatively conformable succession of genetically related beds or bedsets within a parasequence set is bounded by marine flooding surfaces or their correlative surfaces van wagoner. Sequence stratigraphy is the study of sediments and sedimentary rocks in terms. Furthermore, it is claimed that the method of using superpositioned progradational and retrogradational parasequence stacking patterns as indicative of. American association of petroleum geologists bulletin, v. Seismic stratigraphy of quaternary stacked progradational. Sequence stratigraphy emphasizes changes in stratal stacking patterns in response to varying accommodation and sediment supply through time. Sequence stratigraphy of akos field in the coastal swamp depobelt of the niger delta tope s alege department of earth sciences, kogi state university, anyigba, nigeria abstract welllog sequence stratigraphy has been carried out in the akos field aimed at studying its stratigraphic framework. Sequence two contains three parasequences and includes an incised valleyfill at the base overlain by lower shoreface and deltafront facies.
This years gulf coast section sepm 22nd annual bob f. As a result, none of the examples deal with topics related specifically to cores, well logs, or most significantly, seismic. Pdf the recurrence of the same types of sequence stratigraphic surface through. Report of a working group at the 1991 nuna conference on high resolution sequence stratigraphy. These parasequences show a retrogradational followed by an aggradational stacking pattern. Sequence stratigraphy of lower carboniferous rocks in bakhshi. The aggradational to retrogradational stacking pattern of the hugin formation callovian early oxfordian southern viking graben. Rift activity and sequence stratigraphy of the oligocene. Agi training module, interpreting sequence stratigraphy.
Learn vocabulary, terms, and more with flashcards, games, and other study tools. Past sequence stratigraphy is a method for stratigraphic interpretation, pioneered by vail and colleagues in the mid 70s, which explains the complex geometries that sediments create as they fill. The aggradational to retrogradational stacking pattern of the hugin formation callovian early oxfordian southern viking graben, north sea by. In the simplest sense, sequence stratigraphy studies stratal stacking patterns. Sequence stratigraphy as a sequence stratigraphy as a. Stacking patterns of the sequences are retrogradational or progradational depending on tectonic movements and sediment dispersal in the basins. Depositional environments and sequence stratigraphy of the. The sequence stratigraphic concept and the precambrian. Current sequence stratigraphic concepts may clarify the controls on distribution and extents, thickness, and quality of eastern kansas coal seams. Sequence stratigraphy is a method of classifying and interpreting sedimentary rocks and fossils in in terms of variations in the environments 42. Sequence stratigraphic surfaces, facies contacts, systems tracts and condensed shell beds developed during a full cycle of relative sealevel change in a clastic shelframp. The application of ichnology, sedimentology and sequence stratigraphy to identify reservoir distribution in the middle triassic sunset prairie formation, northeastern british columbia. Sequence stratigraphy has geological time significance, when compared to lithostratigraphy which correlates similar rock type only on the bases of lithology often irrespective of the depositional environments.
The result of the sequence stratigraphy analysis for the various well is discussed independently as follows. In this way, accommodation space is created more rapidly than it is filled, water depth becomes deeper, and facies increasingly move farther landward. This stacking pattern, characteristic of the transgressive systems tract and well expressed on well logs, reflects the net landward shift of the shoreline. Sequence stratigraphic analysis from well logs of an x. Parasequence stacking patterns, thirdorder accommodation. Sequence stratigraphy is based on the assumption that eustatic sealevel is the most important control on stratigraphic geometries and facies distribution and therefore on the distribution of reservoir sands and sealing shales aitken and howell, 1996. Transgression is characterized by a retrogradational stack. The sequence stratigraphic concept and the precambrian rock record. The fluvial stratigraphic record of upper assam basin is mainly controlled by eustasy, subsidence, source area upliftment and sediment supply. The turnaround from retrogradational to progradational stacking is probably the stratigraphic limit between the cozzette and the rollins sandstone members. Sequence stratigraphy is a useful alternative to a lithostratigraphic approach, which emphasizes similarity of the lithology of rock units rather than time significance. Carbonate sequence stratigraphy university of georgia. Remember that transgressions typically yield much less sediment than regressions.
Sequence stratigraphy american association of petroleum. A parasequence boundary can separate unique parasequence stacking patterns, which could coincide with a sequence boundary or even a downlap systems tracts boundary. A parasequence set is a group of genetically related strata with clear stacking patterns. Adopting dicksons 1965 method, alizarinred s is used to stain the thin sections to 4. Introduction of sequence stratigraphy linkedin slideshare. Sequence stratigraphy lamontdoherty earth observatory. Mccarthy, and russell kirkham 2009 this dggs report of investigations is a. An increasingly popular way of dividing up the stratigraphic record is on the basis of unconformities into sequences. Sequence stacking patterns and depositional trends in our study intervals are not in line with the rift subsidence rate. Retrogradational aggradational figure 1 shows these three stacking patterns. The sediment accumulation can 1 increase the retrogradational range of the original retrogradational stacking sequences, 2 change an original aggradational stacking sequence to a retrogradational stacking one, and 3 decrease the progradational range of an original progradational stacking sequence, or 4 even change an original. Sets of successive parasequences may display consistent trends in thickness and facies composition and these sets may be progradational, aggradational, or retrogradational. Permian and triassic stratigraphy zagros basin southwest iran. Sequence stratigraphy of well a five sequences have been recognized in this well fig.
Sequence stratigraphy deals with genetically related sedimentary strata bounded by unconformities. Stacking patterns of parasequences in parasequence sets figure 1 are progradational, retrogradational, or aggradational, depending upon the ratio of depositional rates to accommodation rates. Concepts of sequence stratigraphy essentially the same evect as. This online guide is primarily aimed at the application of sequence stratigraphy to outcrops. This aided in the identification of the various systems tracts, sequences and key bounding surfaces. The sequence part of the name refers to cyclic sedimentary deposits. The future of sequence stratigraphy will pay more attention to systems tracts scale and threedimensional stratigraphic variability.
Parasequence sets and stacking patterns an online guide. Facies interpretation, depositional environment and. 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. Sequence stratigraphy subcommission on quaternary stratigraphy. Free web tutorials sequence stratigraphy, tutorials carbonate petrology, seismic interpretation sequence stratigraphy exercises lower cretaceous south africa, seismic interpretation sequence stratigraphy exercises bahamas miocene, seismic interpretation sequence stratigraphy exercises lower cretaceous alaska, clastic outcrop interpretation sequence stratigraphy exercises of bookcliffs. Parasequence sets and stacking patterns an online guide to. Sequence stratigraphy as a concrete stratigraphic discipline abstract sequence stratigraphy is a stratigraphic discipline in which stratigraphic surfaces that represent changes in depositional trend are used for correlation and for defining specific types of sequence stratigraphic units. Introduction to sequence stratigraphy and its application to reservoir. Pdf evaluation of the stratigraphic sequences in the alpha.
Sequence stratigraphy defines rock units based on event significance of their bounding surfaces. Sequence stratigraphy as an interpretation methodology is widely applied in petroleum exploration and production. The aggradational to retrogradational stacking pattern of. Applications of sequence stratigraphy to clastic rocks were described by van. Sequence stratigraphy is the study of rock relationships within timeequivalent depositional successions bounded by surfaces of erosion or nondeposition. Alongside 3d seismic, longreach horizontal drilling and the application of plate tectonics to exploration, sequence stratigraphy has been one of the greatest scientific advances within the petroleum geology industry of the last 50 years. Depositional sequences can also show these trends, and they are called sequence sets.
Sedimentary controls on the sequence stratigraphic. Sequence stratigraphy of gachal formation in madbeiki section. The variation in 6 the weather and sea level can be detected through careful analysis of sequence stratigraphy 7. Prior sequence stratigraphic methods mainly employed twodimensional stacking patterns to reconstruct stratigraphic frameworks. The upper sequence boundary is interpreted as the basal contact of the. Stratal stacking patterns enable determination of the order in which strata were laid down, and explain the geometric relationships and the architecture of sedimentary strata. Stacking patterns of the basinfloor fan and slope fan, contained within the lowstand systems tract, are difficult to identify. Such withintrend facies contacts may be marked on a sequence stratigraphic crosssection only after the sequence stratigraphic framework has been constructed. Carbonates have several aspects that make their response to relative sealevel changes and the character of their sequence stratigraphic elements somewhat different. The sequence stratigraphy is currently, on the one hand, a leading approach in the study of the internal structure of sedimentary basins, on the other hand, a creatively developing discipline, the.
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