New Innovative Technology for Tight Carbonate Reservoir Development, Minagish Field, West Kuwait
EL-Gezeery, Taher 1; Ebaid, Adel 2; AL-Jeaan, Monirah *3; Al-Saqran, Fawaz 4
(1) KOC, Kuwait, Kuwait. (2) KOC, Ahmadi, Kuwait. (3) KOC, Ahmadi, Kuwait. (4) KOC, Ahmadi, Kuwait.
The Lower part of Middle Minagish Oolite reservoir, MO-Layer 13 consists largely of fine-grained, tight bioturbated, lime packstones. Deposition of this interval took place on a shallow very gently sloping outer-ramp; these intervals are more susceptible to stylolitization and/or dolomitization. Most of the cored wells have shown vuggy porosity associated with discontinuous open fractures and small patch reefs along with dolomitic zones toward the base.
The Petrophysical study showed that the layer thickens toward the flanks (north and south) and that porosity is best on the crestal areas. The porosity ranges from 10-16% and the permeability less than 10 md except the areas enhanced by fractures and vugs. The first horizontal well was drilled toward the eastern flank of Minagish structure targeting lower layers by applying the new innovative Geosteering and Chemosteering technologies. Further the well locations and well trajectories were placed in the high oil potential area supported by high resolution seismic interpretations and 3D Geological modeling. Based on the image interpretation, layer-13 drilled through a large number of fractures with fairly large apertures. Resistive patches are seen on the image logs, however the composition of these patches could be carbonate cement or dolomite concentrations associated with patch reefs. Development of vugs along the fractures makes it a high potential production zone in the Middle Minagish reservoir. A cluster of fractures is also observed from LaserStrat analysis. It was discovered that the dolomite concentration can be used to discriminate between different layers. The higher biogenetic production is marked with increase of P2O5 concentrations at the entry of the layer-13. The well is drilled by non-damaging water based mud to minimize the chances of pore throat blocking and completed with new innovative Visco Elastic Surfactant based acid stimulation techniques. The well has recorded remarkable success in terms of sustained oil production and achieved the strategic objectives of WK directorate.
AAPG Search and Discovery Article #90141©2012, GEO-2012, 10th Middle East Geosciences Conference and Exhibition, 4-7 March 2012, Manama, Bahrain