scholarly journals Facies Analysis and Depositional Environment of the Oligocene-Miocene Asmari Formation, Bandar Abbas Hinterland, Iran

2015 ◽  
Vol 05 (04) ◽  
pp. 175-187 ◽  
Author(s):  
Mahdi Hoseinzadeh ◽  
Jahanbakhsh Daneshian ◽  
Seyed Ali Moallemi ◽  
Ali Solgi
Keyword(s):  
Depositional Environment ◽  
Facies Analysis ◽  
Asmari Formation ◽  
Bandar Abbas

scholarly journals Facies Analysis and Depositoinal Environment of D-3 Reservoir Sands Vin Field, Eastern Niger Delta

2019 ◽  
pp. 1-19
Author(s):  
Onyewuchi, Chinedu Vin ◽  
Minapuye, I. Odigi
Keyword(s):  
Seismic Data ◽  
Niger Delta ◽  
Depositional Environment ◽  
Gamma Ray ◽  
Facies Analysis ◽  
Depositional Environments ◽  
Width Ratio ◽  
Neutron Density ◽  
Wireline Logs ◽  
Isopach Map

Facies analysis and depositional environment identification of the Vin field was evaluated through the integration and comparison of results from wireline logs, core analysis, seismic data, ditch cutting samples and petrophysical parameters. Well log suites from 22 wells comprising gamma ray, resistivity, neutron, density, seismic data, and ditch cutting samples were obtained and analyzed. Prediction of depositional environment was made through the usage of wireline log shapes of facies combined with result from cores and ditch cuttings sample description. The aims of this study were to identify the facies and depositional environments of the D-3 reservoir sand in the Vin field. Two sets of correlations were made on the E-W trend to validate the reservoir top and base while the isopach map was used to establish the reservoir continuity. Facies analysis was carried out to identify the various depositional environments. The result showed that the reservoir is an elongate , four way dip closed roll over anticline associated with an E-W trending growth fault and contains two structural high separated by a saddle. The offshore bar unit is an elongate sand body with length: width ratio of >3:1 and is aligned parallel to the coast-line. Analysis of the gamma ray logs indicated that four log facies were recognized in all the wells used for the study. These include: Funnel-shaped (coarsening upward sequences), bell-shaped or fining upward sequences, the bow shape and irregular shape. Based on these categories of facies, the depositional environments were interpreted as deltaic distributaries, regressive barrier bars, reworked offshore bars and shallow marine. Analysis of the wireline logs and their core/ditch cuttings description has led to the conclusion that the reservoir sandstones of the Agbada Formation in the Vin field of the eastern Niger Delta is predominantly marine deltaic sequence, strongly influenced by clastic output from the Niger Delta. Deposition occurred in a variety of littoral and neritic environment ranging from barrier sand complex to fully marine outer shelf mudstones.

scholarly journals GEOCHEMISTRY AND MICROFACIES OF THE RUTEH FORMATION IN THE RUTEH AREA, CENTRAL ALBORZ, IRAN

2019 ◽  
Vol 16 (32) ◽  
pp. 930-944
Author(s):  
G. BABAEE KHOU ◽  
M. H. ADABI ◽  
D. JAHANI ◽  
S. H. VAZIRI
Keyword(s):  
Depositional Environment ◽  
Facies Analysis ◽  
Minor Element ◽  
Upper Permian ◽  
Diagenetic Processes ◽  
Geochemical Study ◽  
Alborz Region ◽  
Dolomite Cement ◽  
East West

To understand microfacies, depositional environment and geochemistry of Upper Permian rocks in Alborz region, the type sections of Ruteh Formation were studied. During the Permian, the Alborz region was a part of the east-west trending Paleotethys sea. Stratigraphic studies indicate that the Ruteh Formation in Ruteh section is composed of thin to massive limestone, argillaceous limestone interbedded with shale, is overlain by distinct laterite horizon of the Elika Formation and is underlain by the disconformity by the Dorud Formation. Facies analysis and petrographic studies led to the recognition of 11 microfacies in Ruteh section. These facies were deposited in 4 facies belts such as tidal flat, lagoon, shoal and open marine sub-environment. The Permian calcareous algae in the Ruteh Formation are widespread and well documented to determine the environment and microfacies of Permian deposits. Cementation and dolomitization are the main diagenetic processes in Ruteh Formation. Based on petrographic (size and fabric) studies, 4 dolomite types such as dolomicrite, dolomicrospar, dolospar, and dolomite cement were recognized. Seawater was the main source of Mg for early diagenetic dolomite (type 1), while Mg for late diagenetic dolomite (types 2,3,4) probably were sourced by shale pressing processes and pressure solution. Major and minor element studies led to there cognition of aragonite mineralogy. The geochemical study illustrates that these carbonates were affected mostly by meteoric diagenesis, which is occurred in a semi-close to open diagenetic system.

scholarly journals Toe-of-slope facies of the Eocene limestones in Aghioi Pantes sequence (Zakynthos island, Western Greece)

2018 ◽  
Vol 34 (2) ◽  
pp. 699
Author(s):  
Μ. ΚΑΤΗ
Keyword(s):  
Shallow Water ◽  
Debris Flows ◽  
Depositional Environment ◽  
Facies Analysis ◽  
Facies Association ◽  
Gravity Flows ◽  
Carbonate Sequence ◽  
Western Greece ◽  
Water Carbonate ◽  
Water Facies

The facies analysis of the Eocene limestones in the Aghioi Pantes section in central Zakynthos, part of the Preapulian carbonate sequence in the greater area, showed three megafacies types: a) graded beds, in which two main subtypes have been recognized, medium- to thin-bedded calcarenites-calcilutites and thick-bedded ruditic calcarenites, consisting mainly of redeposited shallow-water carbonate sands (mostly bioclasts of nummulites and echinoids); based on their sedimentary structures they have been interpreted as low density turbidite and high density turbidite (or sandy debris flows) deposits correspondingly, b) calcareous conglomerates consisting of shallow-water facies lithoclasts and abundant pelagic intraclasts all of which have been interpreted as debris flow deposits and c) folded strata of pelagic-hemipelagic composition that have been interpreted as slumps. Subsequently, the studied limestones constitute exclusively deep-water resedimented facies having been deposited mainly through sediment gravity flows, carrying significant amounts of shallow-water bio- lithoclastic material. The distribution and the organization of this facies association, with the dominance in particular of the base cut-out turbidites, suggest as depositional environment of the studied Eocene limestones a "low" in the outer slope connecting the Preapulian platform with the adjacent Ionian basin.

A sedimentological overview of the coal-bearing Morien Group (Pennsylvanian), Sydney Basin, Nova Scotia, Canada

1987 ◽  
Vol 24 (9) ◽  
pp. 1869-1885 ◽  
Author(s):  
B. R. Rust ◽  
M. R. Gibling ◽  
M. A. Best ◽  
S. J. Dilles ◽  
A. G. Masson
Keyword(s):  
Nova Scotia ◽  
Depositional Environment ◽  
Facies Analysis ◽  
Meandering Rivers ◽  
Meandering Channels ◽  
Basin Fill

The onshore part of the Sydney Basin, Nova Scotia, contains a 2 km fining-upward coal-bearing succession, the Pennsylvanian Morien Group. Facies analysis indicates an upward change in depositional environment from mid- through distal braid-plain to meandering fluvial plain. This change occurred earliest in the southeast part of the basin, where the meandering channels were incised through penecontemporaneous duricrusts. Northeastward drainage was maintained throughout, and the basin fill records gradually decreasing slopes as source relief was worn down and rate of subsidence declined during a period of increasing tectonic quiescence. The uneconomic coals of the lower Morien Group (South Bar and Waddens Cove formations) are thin and inextensive and formed in well-drained swamps of anabranches from the active braided system or between incised meandering channels. The economic coals of the upper Morien (Sydney Mines Formation) are more extensive and formed in broad, humid swamps of large flood basins between the unconfined channels of large meandering rivers.

Sign in / Sign up

Export Citation Format

Share Document