structural style in the zagros: implications for...
TRANSCRIPT
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Geospatial Research Ltd.
Structural Style in the Zagros:
Implications for Hydrocarbon
Systems
Richard Jones
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The Zagros ‘Fold & Thrust’ Belt!
Canadian Rockies
after Price & Mountjoy 1970 (AAPG)
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The Zagros ‘Fold & Thrust’ Belt
Thrust, Qara Dagh
(Kurdistan Region of Iraq)
GoogleEarth, Fars (Iran), looking east
ca. 1m
HZF, Lajin anticline (Tavakoli-Shirazi et al 2013)
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The Zagros ‘Fold & Thrust’ Belt
(GRL Zagros Regional Mapping 2015) Thrust traces Fold axes
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The Zagros ‘Fold & Thrust’ Belt
Behr Bahr anticline, KRI
Asmari anticline (Longhurst 1959)
Asmari anticline,
Iran
Longhurst 1959
Landsat (23 x 34km)
Landsat (20 x 34km)
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Zagros: Main Structural Controls
•Mechanical Stratigraphy
•Structural Inheritance
• Basement fault systems
• Inversion of Tethyan rift structures
•Oblique closure of Tethys Jassim & Goff 2006
www.rci.rutgers.edu
Google Earth
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Mechanical Stratigraphy
Contrasting mechanical strengths of
carbonates vs. mudrocks & evaporites
Kurdistan Region (GRL) Lurestan, Iran (Casciello et al 2009)
Res. Res. Res. Res.
Res.
Res.
Res.
Res.
Res.
Res.
Res.?
Seal
Seal
Seal
Seal
Seal
Seal
Seal
Seal
Seal
Res.
Res.
Res.
Res.
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Mechanical Stratigraphy
Contrasting mechanical properties of strong carbonates
vs. weak mudrocks & evaporites
Iraq-Turkey border zone Iraq-Turkey border zone
Softek, SE Turkey Shaikan, Kurdistan
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High Amplitude vs Wavelength
Mechanical contrast can allow anticlines with high amplitude to
wavelength ratio to develop … excellent stacked 4-way traps
Amedi anticline, Kurdistan
Ramsay & Huber 1987
Sargelu (Gara anticline, Kurdistan)
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Unbreached Fractured Reservoirs
Thick carbonate units are highly fractured – but often not
breached by large-offset thrusts
Aqra-Behkme (Amedi, Kurdistan) Chia Zairi & Kurra Chine (type localities
near the Geli Khana, Iraq-
Turkey border)
Sarvak (Izeh, Iran)
Sherkati &
Letouzey
2004
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Multiple Detachment Zones
… increased structural complexity, lateral
and vertical heterogeneity, and uncertainty
of sub-surface interpretation
Mateen anticline, NE Iraq
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Multiple Detachment Zones
Along-strike vergence changes
Kurdistan Region (GRL)
Mateen-Amedi anticline, Kurdistan Landsat (27 x 50km)
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Multiple Detachment Zones
Parasitic fold closures Lurestan, Iran (Casciello et al 2009)
Sherkati & Letouzey 2004
Mokhtar anticline, Khuzestan, Iran
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Multiple Detachment Zones
Parasitic fold closures
Kedil anticline (parasitic on N side of Softek), near Raman, SE Turkey
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Multiple Detachment Zones
Back-limb, crestal & out-of-syncline thrusts Kurdistan Region (GRL)
Dunnington 1958
seeps, Kor Mor thrust,
SE Kurdistan
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Multiple Detachment Zones
Iran (Casciello et al 2009)
Safari et al 2010
GRL regional xs60
Back-limb, crestal & out-of-syncline thrusts
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Upper & Lower Detachments
Kurdistan Region (GRL)
Taza block, downloaded from www.oilsearch.com
Dahlstrom 1969, Sherkati et al 2005
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Cross Section (Balancing)
Construction algorithms need to allow for different
mechanisms (and geometries) for the strong carbonates
vs. weak mudrocks
Alavi 2007
McQuarrie 2004
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Basement Inheritance
Aqrawi et al 2010 Jassim & Goff 2006
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Basement Inheritance
Aqrawi et al 2010
GRL regional xs60
Transpressional reactivation of
faults of the Nabitah system
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Inversion of Tethyan Rifts
Where are they (there’s a lack of really clear data)
Late Carb. subcrop map
(Aqrawi et al 2010)
Tavakoli-Shirazi et al 2013
Proprietary cross-section based
on interpretation of GRL
mapping in SE Turkey and
northern Kurdistan Region of
Iraq, showing Lower Palaeozoic
in the hangingwall, thrust steeply
on to Paleogene in the footwall.
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Oblique Closure of Tethys
Transcurrent + Compression = Transpression
Harland 1971
Jones & Tanner 1995
Jones et al 2005
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Strain Partitioning
Transcurrent + Compression = Transpression
Proprietary GRL map showing
interpretation of the main regional
tectonic elements of the Zagros,
including newly mapped faults that
allow us to extend recent
geodynamic interpretations from
Iran, northwestwards into Iraq &
SE Turkey
GRL Zagros Regional
Mapping 2015
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Strain Partitioning
add Blanc et al
Blanc et al 2003
GoogleEarth
looking S
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Strain Partitioning: Implications
Compression-dominated zone: very long anticlines
Strike-slip dominated:
• very large earthquakes (MRF)
• very important synthetic regional
faults (Khanaqin-Izeh-Kazerun-
Sarvestan)
Fracture systems are often slightly
asymmetrical to anticlinal hinges (i.e.
partitioning is incomplete)
Bergbauer & Pollard 2004, after Stearns 1968
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Strain Partitioning: Implications
Regional synthetic strike-slip faults:
• difficult to measure large offset
• … but they control the location &
termination of anticlines
• likely to be long-lived, still active
• segmented, anastomosing
• high risk to trap integrity
Kazerun – Kareh Bas (GRL mapping on Google Earth)
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Summary: Main Structural Controls
•Mechanical Stratigraphy
• High amplitude folds, often unbreached
• Highly fractured, contiguous, stacked reservoirs
• Increased complexity (surface & sub-surface)
• … carry out fieldwork – as early as possible!
• Multiple detachments
•Structural Inheritance
• Basement fault systems
• Inversion of Tethyan rift structures (?)
•Oblique closure of Tethys
• Very long anticlines (in compression dominated zone)
• Fracture systems asymmetric to anticlines
• Major 1st order strike-slip zones: very complex,
increased likelihood of breached traps
Jassim & Goff 2006
www.rci.rutgers.edu
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Zagros Workshops
GRL and Mark Allen (Durham University) are planning to
run Zagros workshops in November - December
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GRL Zagros Regional Mapping
Proprietary GRL maps & cross-sections
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ZRM (Phase1): Main Report