Sandstone diagenesis of Hazro Formation in S. Hazro field, southeast Turkey

Conference · Fri Mar 01 04:00:00 EST 1991 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:5791853

Cubukcu, A ^[1]

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1. Turkish Petroleum Co., Ankara (Turkey)

S. Hazro field is located south of Hazro, southeast Turkey. The Lower-Middle Devonian Hazro Formation, which averages 150 m in thickness, is divided into three lithofacies. The Lower Clastic Member is dominated by fine- to medium-grained quartzarenites, interpreted as tidal flat and barrier-bar deposits, with an average thickness of 60 m, bearing gas and condensate. The Upper Clastic Members (consisting mainly of sandstones and dolomite) are of poor reservoir quality. Observations through core and epoxy-impregnated thin section analyses give porosities ranging from 1 to 25% in the sandstones of the Lower Clastic Member. Many well-sorted sandstones with high porosities show evidence of dissolution of lime mud and lack of late diagenetic dolomite cement. Most probably the paragenetic sequence is (1) formation of anhydrite and lime mud cement; (2) dissolution of lime mud and enhancement of secondary porosity; (3) formation of euhedral dolomite and silica overgrowths in the pores; (4) authigenic clay formation; and (5) late diagenetic dolomite cementation. The main authigenic clays that are most abundant in porous sandstones are grain-coating Fe-chlorites, mixed layer illite-chlorites, and pore-bridging hairy illites.

• OSTI ID: 5791853
• Report Number(s): CONF-910403--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 75:3
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030200* -- Natural Gas-- Reserves
Geology
& Exploration
ASIA
BUILDING MATERIALS
CARBONATE MINERALS
CEMENTS
CLAYS
DEVELOPING COUNTRIES
DEVONIAN PERIOD
DIAGENESIS
DOLOMITE
GAS CONDENSATE FIELDS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC HISTORY
GEOLOGY
ILLITE
LITHOLOGY
MATERIALS
MIDDLE EAST
MINERAL RESOURCES
MINERALOGY
MINERALS
NATURAL GAS DEPOSITS
PALEOZOIC ERA
PETROLEUM DEPOSITS
POROSITY
RESERVOIR ROCK
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
STRATIGRAPHY
TURKEY