Formation evaluation and reservoir quality assessment of the Albian clastic sequence in the SWM Oilfield, Southwest the Mesopotamian Basin, Iraq

Abstract This work intends to delineate the petrophysical properties and reservoir quality of Albian sequence in Mesopotamian Basin which has been deposited as a siliciclastic sequence. The well log data (including caliper, gamma-ray, density, photoelectric factor 'PEF', neutron, sonic, resistivity logs), derived from eight wells SWM (Southwest Mesopotamian) Oilfield, was studied interpreted using appropriate software (IP3.6). These borehole indicate necessity divide into five rock units (U1, U2, M, L1, L2 units). enabled depicting porosity, shale volume, water saturation, net-pay thickness vertical horizontal directions. It is indicated that M L1 are most promising with good very porosity ( ∅ ≥ 17.2%), low saturation (Sw ≤ 28.0%), acceptable volume (Vsh 8.4%). varies between 32.8 77.4 m different Oilfield. were supported by more detailed conventional core including He ) permeability k ), parameters estimated precisely. In present study, assessment based on considered for first time evaluating discriminating Albian–Aptian Southwest field zones hydraulic flow units. include Flow Zone Indicator (FZI), Reservoir Quality Index (RQI), effective pore radius R 35 ). Based available parameters, divided three types (RRT1–3). best have assigned medium-grained sandstone RRT1 dominates (av. = 23.0%, av. 1581 mD, 23.7 μm, FZI 7.368 RQI 2.304 μm). On other side, fine-grained RRT3 characterized lowest 17.1%, 5.49 0.92 0.603 0.136 integration stated They predominated fine sandstones RRT2, respectively. log-core applicable oilfields fields basins south Iraq elsewhere.