oa Borehole-Image Log Interpretation in the Wara and Burgan Palaeotransport System, Greater Burgan Fields, Kuwait

The Wara and Burgan Sandstones are a major oil producer in Kuwait. In our study, the formations<br>have been characterized using cores, borehole images and open hole log data from 16 wells. Five<br>lithofacies were determined: (1) massive, cross-bedded and low-angle sandstone units; (2)<br>structureless, cross-bedded and low-angle argillaceous units; (3) interbedded sand and shale<br>heterolithic units; (4) structureless and laminated shale units; and (5) undefined carbonate units.<br>The palaeotransport direction was analyzed separately for the Wara Sandstone and four Members of<br>the Burgan Sandstone, which are the 3 Sand Upper (3SU), 3 Sand Middle (3SM), 3 Sand Lower (3SL)<br>and 4 Sand (4S). Results showed bi-modal and tri-modal distribution of palaeocurrents for some<br>intervals, in agreement with previous interpretations for this field. For the first time, we have identified<br>a main source of sediment from 1350 (40% of the footage) and 2500 (32% of the footage) with a high<br>variation (standard deviation = 1200) for the Wara Sandstone.<br>In 3SU member of the Burgan Formation, 150 was the dominant palaeocurrent direction (45% of the<br>footage), whereas in member 3SM, the palaeocurrent direction is toward the 450 (50% of the footage).<br>In member 3SL, palaeocurrents show a trimodal distribution, with the main trends towards 600 and 100<br>(40% of the footage) and a minor trend towards 2800 (29% of the footage). Finally in member 4S, the<br>main palaeocurrent direction is towards 650 (49% of the footage).<br>Eighteen faults were identified with strike azimuths that range from 3100 to 3450 and dip azimuths that<br>range from 2200 to 2550 (72% of the footage). The NW-SE strike azimuth fits well with the structural<br>trend of the Greater Burgan fields, which consist of three giants Burgan, Magwa and Ahmadi fields.<br>The combination of fault (NW-SE trend) and palaeocurrent distribution (mostly with a NE trend)<br>compartmentalizes the reservoir.