Petrophysical, geomechanical and depositional environment characterization of the Triassic TAGI reservoir from the Hassi Berkine South field, Berkine Basin, Southeastern Algeria

被引:19
|
作者
Baouche, Rafik [1 ]
Sen, Souvik [2 ]
Ganguli, Shib Sankar [3 ]
Feriel, Hadj Arab [4 ]
机构
[1] Univ MHamed Bougara Boumerdes, Fac Hydrocarbons & Chem FHC, Dept Geophys, Lab Mineral & Energy Resources, Boumerdes 35000, Algeria
[2] Geologix Ltd, Dynasty Bldg,Andheri Kurla Rd,Andheri E, Mumbai 400059, Maharashtra, India
[3] CSIR Natl Geophys Res Inst, Deep Seism Res Grp, Uppal Rd, Hyderabad 500007, India
[4] Sonatrach Explorat, Studies & Synth Dept, Boumerdes 35000, Algeria
关键词
Depositional system; Petrophysical characterization; Reservoir geomechanics; In-situ stress; TAGI Sandstone; Berkine basin; PERMEABILITY; STRESS; COMPACTION; SANDSTONES; PRESSURE; SHALE; PORE;
D O I
10.1016/j.jngse.2021.104002
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
An integrated knowledge of the sedimentological data, petrophysical and geomechanical characteristics significantly enhances the understanding of the reservoir properties, leading to a reliable subsurface modeling. This work presents a comprehensive reservoir assessment of the prolific Triassic Argilo-Gre & acute;seux Infe & acute;rieur (TAGI) sandstones of the Hassi Berkine South (HBNS) field, Southeastern Algeria. The Lower Triassic producer appears to be laid down on the Late Devonian erosional surface (Hercynian unconformity) in a fluvial depositional system. Based on the sedimentary structures, a fluvial depositional environment is deciphered from cores. Lateral and vertical disposition of the channel and floodplain deposits from regional well log correlation infers a shift of depositional regime from braided in the SW to meandering in the NE direction. Two distinct reservoir rock types (RRT) are interpreted from core-based petrophysical assessment. RRT1 is composed of macro-megaporous medium to very coarse grained amalgamated channel sandstones and yields the best reservoir attributes, while the mesoporous fine grained RRT2 translates to impervious to poor reservoir quality. RRT1 channel sands are found to be laterally continuous, while the fine grained crevasse splay sands corresponding to RRT2 are laterally discontinuous, thus making them difficult to correlate field wide. Rock-mechanical property-based in-situ stress estimates suggested a normal to strike-slip transitional (Sv >= SHMax > Shmin) stress state in the TAGI Formation. Direct measurements indicate that the TAGI reservoir had an initial pore pressure gradient of 11.08 MPa/km and is presently depleted by 2.1-2.5 MPa. A stable depletion stress path value of 0.57 is inferred considering a pore pressure-minimum horizontal stress coupling. At the present-day depletion rate, normal faulting is unlikely to have happened at the TAGI reservoir level and it can be depleted by another 25 MPa before inducing any production-induced reservoir instabilities.
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页数:12
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