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Miocene ridge potential, L97-30-71
Rollovers forming a series of parallel ridges within the Miocene
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plus associated amplitude anomalies
Miocene ridge potential, L97-30-69
Flatspot within a
rollover plus some
updip potential within
a thrusted fault block
within the Miocene
also associated
amplitude anomalies
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Miocene ridge potential, L97-30-127
Updip high amplitude
potential & flatspot within
Miocene rollover
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Miocene ridge potential, L97-30-125
Possible existence of 3 Miocene ridges each showing amplitude
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anomalies and updip potential
Miocene ridges, How do they map out ?
Miocene ridge, running sub
parallel to the onshore fields.
Prospectivity is within the Red
Series however believe greater
potential in the Miocene.
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TZ Summary
From the examples shown it is clear there is justification for
extending the transition data into the onshore. This would
accurately define the existence of a possible parallel ridge, even
maybe up to 3 ridges. These ridge(s) appear fault controlled from
deep seated thrustal complexes confined to the southeast of the
survey. While it is appreciated that the Red Series is the major
producing reservoir in the offshore region. It cannot be ignored
that the Miocene could be a major producer in the nearshore
area as it ‘shallows up’ towards the onshore fields.
In addition there is also potential for an inward extension of the
delta complex in the north and an eastern extension of the
Erdekli structure.
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Summary of the Petroleum Geology
• Working petroleum system
• World class source rocks
• Clastic reservoirs
• Compression and transpression
• Clear evidence of vertical migration
• Local regional and seals
• Good timing of migration re structure
• Abundant seeps and discoveries
• onshore and along Chelekin ridge
• New high quality seismic gives a good indication of what lies in
the unexplored strata
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What are WesternGeco doing in the future ?
Implementation of a geological program
• Phase 3 plan to extend existing offshore regional lines onto
onshore down to depth of 20 seconds. Why ?
– To image basement and beyond. Current seismic in offshore
only just images base Miocene.
– Greater understanding of deeper tectonics
– Non exclusive data available to all oil companies
Eastern Transition zone survey linking the onshore data with
offshore grid. Why ?
– Recent studies by WG/TGL indicate presence of a ridge
analogous to onshore fields.
– Greater understanding of source rocks and fault geometries,
vital for fluid migration.
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Cont’d………
• Extend offshore grid into Turkmenbashi Bay. Why ?
– To complete seismic coverage in an otherwise virgin area and
to link up with onshore legacy data
• In 2002/3 WG have completed 2 Onshore 3D
interpretation & Reservoir characterisation studies for
TGL
– This can now be integrated with the large offshore program
to provide a regional consistent geoseismic model.
• Feasibility study for Pore Pressure Prediction in
Western Turkmenistan. Why ?
– To investigate if seismic can be used with confidence to
predict subsurface pressures and to provide quality
information on which to base drilling decisions.
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WesternGeco commitment to
Turkmenistan is 100%
Thankyou
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