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Geological Formation and Reservoir Data

This document provides a lithological description and drilling information for rock formations in a well from the Quaternary period to the Upper Permian period. Key hydrocarbon bearing reservoirs include the Thamama series formations Th I-VI and zones A and B of the Arab Group in the Upper Jurassic. The main reservoir is the Th II formation, while the Th III is used for water injection. Drilling was generally fast through limestone and dolomite formations while shale caused partial losses and shale collapse slowed drilling.

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155 views1 page

Geological Formation and Reservoir Data

This document provides a lithological description and drilling information for rock formations in a well from the Quaternary period to the Upper Permian period. Key hydrocarbon bearing reservoirs include the Thamama series formations Th I-VI and zones A and B of the Arab Group in the Upper Jurassic. The main reservoir is the Th II formation, while the Th III is used for water injection. Drilling was generally fast through limestone and dolomite formations while shale caused partial losses and shale collapse slowed drilling.

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mdalgamouni
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SERIES FORMATION TRUE LITHOLOGICAL DESCRIPTION

VERT.
THICK. RELEVANT DRILLING INFORMATION
QUATERNARY Limestone and Dolomite
Bioclastic, Grainstone, Vuggy
PLIOCENE & GACHARAN Anh with Arg LST DOL & Anh with shale beds
MIOCENE ROP: fast
OLIGOCENE ASMARI LST mainly packstone. ROP: fast
EOCENE DAMMAN partial losses 925TVT DOL f. xllne, LST, DOL LST. ROP: very fast
RUS 352TVT ANH massive w DOL interbeds
PALAEOCENE UMM ER 1215 DOL,mxlne-fxllne, sac vuggy ROP: fast, losses
TVT
RADHUMA comp/part loss LST wackestone,DOL, arg at base.
SIMSIMA losses/flows 934TVT LST packstone w DOL & DOL LST
UPPER FIQA 706TVT Marl w arg LST, Grey shale at base
CRETACEOUS HALLUL 375TVT LST wackestone, chalky bioclasts
LAFFAN 98TVT Shale, brown grey
SAL MISHRIF 849TVT LST pack/wackestone, no Mishrif in Cent A-D
MIDDLE ABI SHILAIF LST mud/wackestone, arg bituminous
CRETACEOUS KH MAUDUD 76TVT
NAHR UMR shale collapse 419TVT Shale, grey green non-calcareous
SHUIBA I
T KHARAIB II Reservoir zone:seepage losses in reservoir zone
LOWER H LEKHWAIR III LST grain/packstone
CRETACEOUS A ZAKUM MBR IV Some wackstone, chalky,alt porous and dense int-
M HABSHAN V -ervals, becoming dense towards base of group
VI
HITH 200TVT ANH with DOL hard
A/B LST, ANH subordinate DOL
UPPER JURASSIC ARAB C 750TVT LST, ANH subordinate DOL
(oil bearing) D DOL, LST grain/packstone
DIYAB LST, grain/packstone, arg hard
UPPER ARAEJ
MIDDLE JURASSIC UMWEINAT LST, grain/packstone, some wacke/mudstone
LOWER ARAEJ
MIDDLE / LOWER IZHARAH LST,mud/grainstone,DOL w shale,marl & DOL
JURASSIC HAMLAH DOL and dolomitic LST
UPPER TRIASSIC GULAILAH DOL,ANH, dol LST,& occ SHALE
MIDDLE / LOWER SUDAIR DOL and red shale, minor LST
TRIASSIC
UPPER PERMIAN KHUFF Dol LST, LST & DOL, minor ANH marker bed
SST, minor SLTST, CST
NOTES: reservoirs are the Thamama series and the Arab Group. Th I-VI are all oil bearing (except for V in Adma areas, oil
is present in V in Zadco operations but is not produced). The main reservoir is the Th II. Th III is used for injection. In the
Arab Group, only the A and B zones are oil bearing.

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