scholarly journals Outcrop Analogue Study of Deformation Bands and Their Impact on Rock Properties of the Productive Series in South Caspian Basin

2017 ◽  
Author(s):  
Gasham Zeynalov ◽  
Shahriyar Alkhasli ◽  
Aydin Shahtakhtinskiy
Keyword(s):  
Rock Properties ◽  
Caspian Basin ◽  
Deformation Bands ◽  
South Caspian Basin ◽  
Analogue Study

scholarly journals Quantifying occurrence of deformation bands in sandstone as a function of structural and petrophysical factors and their impact on reservoir quality: an example from outcrop analog of Productive Series (Pliocene), South Caspian Basin

2022 ◽  
Author(s):  
Shahriyar Alkhasli ◽  
Gasham Zeynalov ◽  
Aydin Shahtakhtinskiy
Keyword(s):  
Gamma Ray ◽  
Field Measurements ◽  
Integrated Approach ◽  
Rock Properties ◽  
Caspian Basin ◽  
Positive Trend ◽  
Deformation Bands ◽  
South Caspian Basin ◽  
Reservoir Properties ◽  
Natural Gamma

AbstractDeformation bands (DB) are known to influence porosity and permeability in sandstones. This study aims to predict the occurrence of DB and to quantify their impact on reservoir properties based on field measurements in the steeply dipping limb of a kilometer-scale fold in Yasamal Valley, western South Caspian Basin. An integrated approach of characterizing bands and their effect on reservoir properties included measurements of natural gamma radioactivity and permeability using portable tools, along with bed dip and the count of DB across distinct facies. A set of core analyses was performed on outcrop plugs with and without bands to estimate the alteration of rock properties at the pore scale. Interpretation of outcrop gamma-ray data indicates the absence of bands in Balakhany sandstones containing shale volume greater than 18% for unconsolidated and 32% for calcite-rich facies. A high amount of calcite cement appears to increase the number of DB. A poor, positive trend between bed dip and DB concentration was identified. We show that net to gross, defined as the thickness fraction of sandstone bound by mudstones, is among the parameters controlling the occurrence of bands. Samples containing a single DB show a 33% and 3% decrease in permeability and porosity, respectively, relative to the host rock. We reveal a new set of lithological and petrophysical factors influencing DB occurrence. This study offers a direct tool that can be applied in subsurface reservoir analogs to predict the occurrence and concentration of DB and estimate their influence on rock properties.

scholarly journals Crustal density structure of the northwestern Iranian Plateau

2019 ◽  
Vol 56 (12) ◽  
pp. 1347-1365 ◽  
Author(s):  
Vahid Teknik ◽  
Abdolreza Ghods ◽  
Hans Thybo ◽  
Irina M. Artemieva
Keyword(s):  
High Density ◽  
Central Iran ◽  
P Wave ◽  
Arabian Plate ◽  
Scale Model ◽  
Moho Depth ◽  
Caspian Basin ◽  
The South ◽  
South Caspian Basin ◽  
Iranian Plateau

We present a new 2D crustal-scale model of the northwestern Iranian plateau based on gravity–magnetic modeling along the 500 km long China–Iran Geological and Geophysical Survey in the Iranian plateau (CIGSIP) seismic profile across major tectonic provinces of Iran from the Arabian plate into the South Caspian Basin (SCB). The seismic P-wave receiver function (RF) model along the profile is used to constrain major crustal boundaries in the density model. Our 2D crustal model shows significant variation in the sedimentary thickness, Moho depth, and the depth and extent of intra-crustal interfaces. The Main Recent Fault (MRF) between the Arabian crust and the overriding central Iran crust dips at approximately 13° towards the northeast to a depth of about 40 km. The geometry of the MRF suggests about 150 km of underthrusting of the Arabian plate beneath central Iran. Our results indicate the presence of a high-density lower crustal layer beneath Zagros. We identify a new crustal-scale suture beneath the Tarom valley between the South Caspian Basin crust and Central Iran and the Alborz. This suture is associated with sharp variation in Moho depth, topography, and magnetic anomalies, and is underlain by a 20 km thick high-density crustal root at 35–55 km depth. The high-density lower crust in Alborz and Zagros may be related to partial eclogitization of crustal roots below about 40 km depth. The gravity and magnetic models indicate a highly extended continental crust for the SCB crust along the profile. Low observed magnetic susceptibility of the Kermanshah ophiolites likely indicates that the ophiolite rocks only form a thin layer that has been thrust over the sedimentary cover.

Geologic-geochemical and modelling studies of hydrocarbon migration in the South Caspian basin

2020 ◽  
pp. 4-15
Author(s):  
M.F. Tagiyev ◽  
◽  
I.N. Askerov ◽  
◽  
◽  
...  
Keyword(s):  
Sedimentary Cover ◽  
Geochemical Data ◽  
Caspian Basin ◽  
Hydrocarbon Generation ◽  
The South ◽  
South Caspian Basin ◽  
Hydrocarbon Migration ◽  
Upward Migration ◽  
Modelling Studies ◽  
Hydrocarbon Charge

Based on pyrolysis data an overview is given on the generative potential and maturity of individual stratigraphic units in the South Caspian sedimentary cover. Furthermore, the pyrolysis analyses indicate that the Lower Pliocene Productive Series being immature itself is likely to have received hydrocarbon charge from the underlying older strata. The present state of the art in studying hydrocarbon migration and the "source-accumulation" type relationship between source sediments and reservoired oils in the South Caspian basin are touched upon. The views of and geochemical arguments by different authors for charging the Lower Pliocene Productive Series reservoirs with hydrocarbons from the underlying Oligocene-Miocene source layers are presented. Quantitative aspects of hydrocarbon generation, fluid dynamics, and formation of anomalous temperature & pressure fields based on the results of basin modelling in Azerbaijan are considered. Based on geochemical data analysis and modelling studies, as well as honouring reports by other workers the importance and necessity of upward migration for hydrocarbon transfer from deep generation centers to reservoirs of the Productive Series are shown.

Gobiid fishes of the generaChasar,MesogobiusandNeogobius(Teleostei: Gobiidae) from Iran (South Caspian Basin)

2007 ◽  
Vol 41 (1) ◽  
pp. 55-62 ◽  
Author(s):  
Harald Ahnelt ◽  
Brian W. Coad ◽  
Asghar Abdoli ◽  
Hossein Piri Zirkohy
Keyword(s):  
Caspian Basin ◽  
South Caspian Basin

Sedimentation in a discharge dominated fluvial-lacustrine system: the Neogene Productive Series of the South Caspian Basin, Azerbaijan

2004 ◽  
Vol 21 (5) ◽  
pp. 613-638 ◽  
Author(s):  
D.J Hinds ◽  
E Aliyeva ◽  
M.B Allen ◽  
C.E Davies ◽  
S.B Kroonenberg ◽  
...  
Keyword(s):  
Caspian Basin ◽  
The South ◽  
South Caspian Basin

Understanding lateral and vertical fluid variations in the Pliocene sandstone reservoirs in the eastern South Caspian Basin

AAPG Bulletin ◽  
2021 ◽  
Vol 105 (11) ◽  
pp. 2181-2205
Author(s):  
Sabine Mehay ◽  
Mohamed Hashem ◽  
Lamia Rouis ◽  
Eldar Mollianiyazov ◽  
Barry Bennett ◽  
...  
Keyword(s):  
Caspian Basin ◽  
South Caspian Basin ◽  
Sandstone Reservoirs
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