Sequence stratigraphy of experimental strata under known conditions of differential subsidence and variable base level

AAPG Bulletin ◽  
2009 ◽  
Vol 93 (4) ◽  
pp. 503-533 ◽  
Author(s):  
John Martin ◽  
Chris Paola ◽  
Vitor Abreu ◽  
Jack Neal ◽  
Ben Sheets
Keyword(s):  
Sequence Stratigraphy ◽  
Base Level

THE APPLICATION OF SEQUENCE STRATIGRAPHY TO EXPLORATION AND RESERVOIR DEVELOPMENT IN THE COOPER-EROMANGA-BOWEN-SURAT BASIN SYSTEM

2001 ◽  
Vol 41 (1) ◽  
pp. 223 ◽  
Author(s):  
S.C. Lang ◽  
P. Grech ◽  
R. Root ◽  
A. Hill ◽  
D. Harrison
Keyword(s):  
Sequence Stratigraphy ◽  
Sediment Supply ◽  
Sediment Flux ◽  
Sequence Stratigraphic ◽  
Base Level ◽  
Reservoir Development ◽  
Eastern Australia ◽  
Water Tables ◽  
Marine System ◽  
Basin System

The application of sequence stratigraphy to non-marine strata in intracratonic basins is still in its infancy, however, the predominantly non-marine Cooper- Eromanga-Surat-Bowen basin system of Eastern Australia provides an excellent opportunity to demonstrate how sequence stratigraphic concepts can be applied to non-marine successions to assist with exploration and reservoir development. The key to applying sequence stratigraphic concepts in non-marine basins lies in understanding the role of alluvial sediment accommodation relative to sediment supply. Accommodation is created by a combination of tectonic subsidence, compaction and changing water tables in floodplain lakes, marshlands and peat mires. If the alluvial basin is directly connected to the marine system then eustacy may influence accommodation in the lower reaches of the alluvial network, but its effect will significantly diminish upstream depending on the slope. Climate change will, however, have an impact on fluvial discharge, rising water tables, floodplain lake levels, and sediment flux. For sediments to accumulate, accommodation must be positive, whereas negative accommodation leads to erosion. Fluvial accommodation is, therefore, comparable with the concept of base-level. During an episode of basin-wide tectonic uplift or tilting, falling base-level (negative accommodation) leads to widespread erosion on the basin margins or over intra-basinal highs, and an unconformity equivalent to a sequence boundary develops. If followed by a period of low accommodation, rivers rework much of their floodplain, resulting in a sheetlike, amalgamated succession of predominantly sandy bedload deposits of high nett to gross, equivalent to an alluvial lowstand. Further downstream, lowstand deltas may form in the lakes.

Significance of Terrace Deposits in Fluvial Sequence Stratigraphy

2013 ◽  
Vol 318 ◽  
pp. 423-427
Author(s):  
Guang Ming Hu ◽  
Shun She Luo ◽  
Marjorie A. Chan ◽  
Hong Ping Xiao
Keyword(s):  
Sea Level ◽  
Sequence Stratigraphy ◽  
Controlling Factors ◽  
Controlling Factor ◽  
Specific Information ◽  
Half Cycle ◽  
Fluvial System ◽  
Sequence Stratigraphic ◽  
Base Level ◽  
Stratigraphic Model

The terrace deposits in a river valley are key records to the research of fluvial sequence stratigraphy. Terrace deposits and the basal sequence boundary comprise the half-cycle of base level fall, and the fluvial infillings belong to the half-cycle of base level rise. Thus, terrace deposits and the basal sequence boundary are part of the regressive systems tract, and should be separated from the transgressive or lowstand systems tracts in previously published littoral fluvial sequence stratigraphic models. In addition, in the upstream portions of the fluvial system where sea level cannot reach, the fluvial sequence is influenced by tectonism and/or climate. The terrace deposits can provide specific information about the main controlling factor (e.g., tectonism or climate) and its varying pattern during the half-cycle of base level fall. Because the two half-cycles of base level fall and rise are at the same stratigraphic levels and belong to the same base level cycle, it is possible to research the controlling factor and its varying pattern during the rising half-cycle, which will be significant to an inland fluvial sequence stratigraphic model. Finally, the authors assert that seeking isochronous parasequence correlation based on 4-division models (4 different systems tracts), along with the blend of sedimentology and geomorphology and diversification of models based on different controlling factors will collectively produce more robust-interpretations of fluvial sequence stratigraphy in the future.

scholarly journals Reservoir prediction of shallow braided delta front by Comprehensive Prediction Error Filtering Analysis

2021 ◽  
Vol 245 ◽  
pp. 01029
Author(s):  
Wenjuan Li
Keyword(s):  
High Resolution ◽  
Sequence Stratigraphy ◽  
Prediction Error ◽  
Oil Field ◽  
Delta Front ◽  
Reservoir Prediction ◽  
Base Level ◽  
High Resolution Sequence Stratigraphy ◽  
Fifth Order ◽  
Filter Analysis

For a more accurate reservoir prediction of braided delta front, the method of High Resolution Sequence Stratigraphy was adopted in Moxizhuang Oil Field with the assistance of Comprehensive Prediction Error Filter Analysis. J1s2 was divided into 2 fifth-order base-level cycles, 5 sixth-order base-level cycles, with the turnaround surfaces of base-level rise to fall, and time-equal correlation of shallow braided delta front was achieved. Through study of microfacies correlation in High Resolution Sequence Stratigraphy frame, it is apparent that base-level cycles control microfacies distribution, and furthermore reservoir distribution: reservoirs around turnaround surface of base-level falling to rising are thick and laterally connected, while reservoirs near the middle of base-level falling and base-level rising are relatively thinner and less laterally connected, and reservoirs close to the beginning of base-level falling and the end of base-level rising are undeveloped.

Analysis of High-Frequency Sequence Stratigraphy Architecture of Putaohua Oil Layer in Sanzhao Sag of Songliao Basin

2013 ◽  
Vol 868 ◽  
pp. 177-180 ◽  
Author(s):  
Zheng Li ◽  
Shi Zhong Ma ◽  
Yu Sun ◽  
Jin Yan Zhang
Keyword(s):  
High Resolution ◽  
Sequence Stratigraphy ◽  
High Frequency ◽  
Songliao Basin ◽  
The South ◽  
Medium Term ◽  
Short Term ◽  
Base Level ◽  
Frequency Sequence ◽  
High Resolution Sequence Stratigraphy

Using high-resolution sequence stratigraphy theory and its technology, based on 22 well cores and 4 256 logging data, interface types and characteristics of different grades the base-level cycle in Putaohua oil layer of Sanzhao Sag was systematically analyzed, and Putaohua oil layer is divided into 1 medium-term base level cycle, 4 short-term base level cycles, 8 super-short-term base level cycles, established high-resolution sequence strata framework, and proposed sequence stratigraphy model of middle super-short-term base level cycles meridionally grado-thin and up to vanish with syndepositional structure lifting control in the south of Putaohua oil layer. Sandstone is offlap Pinch-out in the upper of Putaohua oil layer, and Sandstone is onflap Pinch-out in the under of Putaohua oil layer from north to south.

scholarly journals Facies Analysis and Sequence Stratigraphy of Missole Outcrops: N’Kapa Formation of the South-Eastern Edge of Douala Sub-Basin (Cameroon)

2017 ◽  
Vol 7 (1) ◽  
pp. 35
Author(s):  
Paul Gustave Fowe Kwetche ◽  
Marie Joseph Ntamak-Nida ◽  
Adrien Lamire Djomeni Nitcheu ◽  
Jacques Etame ◽  
François Mvondo Owono ◽  
...  
Keyword(s):  
Sequence Stratigraphy ◽  
Early Stage ◽  
Depositional Environments ◽  
Facies Association ◽  
Base Level ◽  
Facies Associations ◽  
Climate Evolution ◽  
Floodplain Deposits ◽  
Channel Deposits ◽  
Eastern Edge

Missole facies description and sequence stratigraphy analysis allow a new proposal of depositional environments of the Douala sub-basin eastern part. The sediments of Missole outcrops (N’kapa Formation) correspond to fluvial/tidal channel to shallow shelf deposits with in some place embayment deposits within a warm and semi-arid climate. Integrated sedimentologic, palynologic and mineralogical data document a comprehensive sequence stratigraphy of this part of the Douala sub-basin. Five facies associations occur: (1) facies association I is characterized by Floodplain deposits; (2) facies association II is Fluvial to mouth bar deposits; (3) facies association III characterise Shallow Shelf deposits; (4) facies association IV represents Distal bay or Lacustrine déposits; and (5) Facies association V is made of Fluvial channel deposits. Six depositional sequences were identified. These sequences are composed of four progradational sequences and two retrogradational sequences containing a fluvial channel portion represented by lag deposits at the base of retrogradational sequences. These deposits represent the outset of the relative sea level rise period. In the study area, the N’kapa Formation is composed of non-marine/coastal aggradational deposits representing the early stage of the regressive period. The occurrence of the estuarine/bay deposits with paleosols development is interpreted as evidence of climate change with significant relative base level fluctuation. The study of key minerals associated to sequence stratigraphy as well as palynology demonstrated that sequence architecture has been controlled mostly by climate evolution and outcrops are dated Paleocene – early Eocene.

Representation of information in SEM by equal signal lines

1978 ◽  
Vol 36 (1) ◽  
pp. 144-145
Author(s):  
E. Rau ◽  
N. Karelin ◽  
V. Dukov ◽  
M. Kolomeytsev ◽  
S. Gavrikov ◽  
...  
Keyword(s):  
Electronic System ◽  
Space Distribution ◽  
Specimen Surface ◽  
Universal Method ◽  
Base Level ◽  
Signal Value ◽  
Information Signal ◽  
Fixed Base ◽  
Scanning Line ◽  
Amplitude Analyzer

There are different methods and devices for the increase of the videosignal information in SEM. For example, with the help of special pure electronic [1] and opto-electronic [2] systems equipotential areas on the specimen surface in SEM were obtained. This report generalizes quantitative universal method for space distribution representation of research specimen parameter by contour equal signal lines. The method is based on principle of comparison of information signal value with the fixed levels.Transformation image system for obtaining equal signal lines maps was developed in two versions:1)In pure electronic system [3] it is necessary to compare signal U (see Fig.1-a), which gives potential distribution on specimen surface along each scanning line with fixed base level signals εifor obtaining quantitative equipotential information on solid state surface. The amplitude analyzer-comparator gives flare sport videopulses at any fixed coordinate and any instant time when initial signal U is equal to one of the base level signals ε.

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