Systematic Identification of Sequence Stratigraphic Units from Wireline Logs

1996 ◽  
pp. 29-37
Author(s):  
GEOFFREY C. BOHLING ◽  
JOHN H. DOVETON ◽  
W. LYNN WATNEY ◽  
John E. Beitzel ◽  
Eric P. Mason
Keyword(s):  
Sequence Stratigraphic ◽  
Wireline Logs ◽  
Systematic Identification

LATE CRETACEOUS PONDED TURBIDITE SYSTEMS: A NEW STRATIGRAPHIC PLAY FAIRWAY IN THE BROWSE BASIN

2004 ◽  
Vol 44 (1) ◽  
pp. 269 ◽  
Author(s):  
J.M. Benson ◽  
S.J. Brealey ◽  
C.W. Luxton ◽  
P.F. Walshe ◽  
N.P. Tupper
Keyword(s):  
Late Cretaceous ◽  
Small Area ◽  
Source Rocks ◽  
Hydrocarbon Migration ◽  
Sequence Stratigraphic ◽  
Trapping Mechanism ◽  
Stratigraphic Analysis ◽  
Wireline Logs ◽  
Net To Gross ◽  
Set Up

Regional seismic and sequence stratigraphic analysis of the Browse Basin identified a new Late Cretaceous play fairway involving ponded turbidite systems deposited within confined basins. This work highlighted the potential for isolated sandstone reservoirs in the Middle Campanian sequence of the Caswell Sub-basin. Extensional faults were expected to provide vertical conduits for charge from underlying Early Cretaceous source rocks.The play concept was tested by the drilling of two exploration wells in 2001. The Carbine prospect was a potential stratigraphic trap involving deposition of turbidite sandstones within a localised basin set up by slumping in an intra-slope setting. Carbine–1 penetrated a 77 m thick section of high quality, 100% net-to-gross sandstone but failed to encounter hydrocarbons.A similar ponded turbidite model was invoked for the Marabou prospect although in this case the confined basin was controlled by pre-existing topography at the toe of the slope. The trapping mechanism for Marabou was largely stratigraphic although a small area of anticlinal closure was present. Marabou–1 penetrated 102 m of good quality sandstone with elevated gas readings over the uppermost 22 m. Borehole problems prevented the acquisition of wireline logs or testing but it appears likely that the well penetrated a sub-commercial hydrocarbon column restricted to the four-way dip closure.The well results confirmed the presence of ponded turbidite systems with excellent reservoir characteristics. Further work is required, however, to address the critical risks associated with hydrocarbon migration and updip seal. Nevertheless, ponded turbidite systems remain attractive exploration targets particularly in basins where updip seal is assisted by structuring and where the reservoirs are intercalated with prolific source rocks.

SEQUENCE STRATIGRAPHIC INTERPRETATION OF CARBONATE WIRELINE LOG MOTIFS: AN EXAMPLE FROM THE NORTH WEST SHELF OF AUSTRALIA

1998 ◽  
Vol 38 (1) ◽  
pp. 188 ◽  
Author(s):  
J.N.F. Hull ◽  
S.A. Smith ◽  
H.C. Young
Keyword(s):  
Sharp Increase ◽  
Passive Margin ◽  
Log Analysis ◽  
North West ◽  
Sequence Stratigraphic ◽  
Carbonate Sedimentation ◽  
The North ◽  
Wireline Logs ◽  
Definition Of ◽  
Sequence Boundaries

An integrated biostratigraphic, wireline and seismic sequence stratigraphic study has been conducted to constrain the timing and evolution of Late Cretaceous to Tertiary depocentres along the North West Shelf of Australia. During this study a model for the sequence stratigraphic interpretation of wireline logs in this carbonate-dominated regime has been developed.A series of readily identifiable, lowstand clastic deposits interspersed within the predominantly carbonate passive margin section of the North West Shelf provide well-defined correctable events with which to divide the section. Biostratigraphic data have indicated the presence of missing section at the base of these clastic deposits and their shelfal equivalents. These events have been correlated to define sequence boundaries that are represented on wireline log data by a sharp increase in the gamma signature. Lowstand systems tracts exhibit an irregular sonic and upwardly increasing gamma signature. Transgressive systems tracts show characteristically upward-decreasing gamma and sonic profiles. Maximum flooding surfaces have been identified as the point of cleanest carbonate sedimentation represented by gamma minima on wireline logs. Log motifs exhibiting little character have been interpreted as highstand systems tracts. On seismic these sequence stratigraphic events are represented by stratal geometries that would be expected for these systems tracts.The model has enabled the definition of a higher resolution chronostratigraphic framework for the Mid Cretaceous to Recent section of the North West Shelf than has previously been possible. Forty basin-wide events have been identified from the biostratigraphic and wireline log analysis, thirty of which can be tied throughout the Barrow, Dampier and Roebuck basins.

Integrating Wireline Logs and Seismic Data to Analyse The Facies snd Paleogeography of Tanjung Formation, Barito Basin, South Kalimantan

2020 ◽  
Author(s):  
E. A. Rosa
Keyword(s):  
Sequence Stratigraphy ◽  
Seismic Data ◽  
Depositional Environment ◽  
Well Logs ◽  
Facies Distribution ◽  
Sequence Stratigraphic ◽  
Core Data ◽  
Wireline Logs ◽  
Depositional Models

The study area is physiographically part of the Barito Basin, South Kalimantan (Van Bemmelen, 1949). 2D seismic data along with well logs from three wells, biostratigraphy data from two wells, and core data are utilized to do an integrated sequence stratigraphy. Petrography data from the equivalent formation at well-X from the study area is also used to support the evaluation. This study was to determine lithology facies and depositional environment based on several key maps: Sand Shale Ratio (SSR), Isopach, and Paleogeographic Maps. After that, seismically-supported sequence stratigraphy was applied to vertically and laterally subdivide the facies distribution and paleogeography into two depositional models based on the following key sequence-stratigraphic markers: (1) Sequence Boundary (SB)-1 to SB-2 that show regressive succession, and (2) SB-2 to Top Tanjung Formation that reflects transgressive phase.

Incorporation of Sequence Stratigraphy in Gas Reservoir Correlation: A Case Study

2019 ◽  
Vol 45 (2) ◽  
pp. 209-216
Author(s):  
Afroza Parvin ◽  
ASM Woobaidullah
Keyword(s):  
Sequence Stratigraphy ◽  
Reservoir Characterization ◽  
Gamma Ray ◽  
Stratigraphic Correlation ◽  
Gas Field ◽  
Sequence Stratigraphic ◽  
Neutron Porosity ◽  
Wireline Logs ◽  
Surma Basin

The application of sequence stratigraphy to resolve the miscorrelation between different genetic units in reservoir characterization in a gas field of Surma Basin is dealt with. Interpretation of available seismic and wireline logs (gamma ray, resistivity, density and neutron porosity) give the sequence stratigraphic correlation of reservoir sands. The reservoirs geometry, its extent, seal architecture and trapping styles have been revealed better with this correlation. There is juxtaposition of two reservoir sands, namely A1 and A2. A1 is located at older highstand sand, whereas A2 is in the younger lowstand sand. Lithostratigraphically they might be same but sequences stratigraphy reveals that they are different and deposited at different times. Moreover, the concept reveals that lowstand sand has better reservoir quality than any highstand and transgressive sand. Asiat. Soc. Bangladesh, Sci. 45(2): 209-216, December 2019

Systematic identification of novel lincRNAs involved in chemoresistance using CRISPR/Cas9 screens

2016 ◽  
Vol 54 (08) ◽  
Author(s):  
T Zhan ◽  
LI Franke ◽  
M Arnold ◽  
M Breinig ◽  
F Heigwer ◽  
...  
Keyword(s):  
Systematic Identification

ASTERACEOUS FLORA OF TERAI REGION OF EASTERN UTTAR PRADESH, INDIA

2017 ◽  
Vol 23 (1) ◽  
Author(s):  
KANCHAN LATA
Keyword(s):  
Uttar Pradesh ◽  
Eastern Uttar Pradesh ◽  
Systematic Identification

The systematic identification of 78 species belonging to 51 genera reported from Terai region of Eastern Uttar Pradesh, India. The present paper provides key to genera, list of plant with their habit, phenology and voucher number of each species.

Cyclic and sequence-stratigraphic characteristics of the Vize-Serpukov deposits of the southern part of Moscow syncline

2018 ◽  
pp. 30-41
Author(s):  
R . R . Gabdullin ◽  
А. V. Bershov ◽  
Е. N. Samarin ◽  
N. V. Badulina ◽  
М. А. Afonin ◽  
...  
Keyword(s):  
Generalized Model ◽  
Sequence Stratigraphic ◽  
Biogenic Carbonate ◽  
Clastic Sediments

Composition and origin of Visean–Serpukhovian deposits of the Southern part of the Moscow syncline based upon generalizations of our own results and analysis of published and unpublished data were specified. The levels of karst-influenced rocks correspond to the shallowest biogenic carbonate organogeneous-clastic sediments of the initial and final phases of the eustatic cycle, i.e. the beginning of the transgression (the transgressive system of the tracts) and the end of the regression (the second half of the high-standing tract). In the karst cavities alluvial sands of the Oka river were found. A generalized model of the sequence was proposed and a sequential-stratigraphic interpretation of the studied section was carried out.

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