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Title: Evaluation of the Unconventional Hydrocarbon Potential of the Najmah Formation in the West Kuwait Fields
Authors: Dalal Ahmad Mohammad 
Supervisor: Dr. Fowzia Hussain Abdullah
Keywords: Mudstone : peloidal
Issue Date: 2017
Publisher:  Kuwait university - college of graduate studies
Abstract: The main objective of this study is to evaluate the hydrocarbon potential of the Najmah Formation in three oil fields (Umm Gudair, Minagish and Dharif) located west Kuwait. An integration of the available geological, sedimentological, geochemical, (organic and inorganic) data analysed from core samples, calibrated with wireline logs to evaluate the hydrocarbon potential of this prospective interval. Najmah Formation is an organic rich bituminous source rock which, composed of mixed argillaceous wackestones and mudstones. It ranges in thickness from 130-330 ft. It is subdivided into Najmah Unit I to Unit IV. Najmah I (15-25 ft) and III (30-180 ft) units are the organic rich (kerogen prone) intervals. Najmah III Unit is the main target in this study which has a very high total organic content (TOC) values (2-18% wt.). It is in the oil generation window where vitrinite reflectance (VRo) is in the range of 0.7- 0.9%, with notable variation within individual fields. The organic matter type in these kerogen rich rocks are dominantly type II with some scattered type I and type III at places. Tight carbonates of Najmah Unit II is lean in organic carbon and isn’t considered as unconventional hydrocarbon target for exploration and production. Najmah Unit IV has a moderately good organic enrichment at some locations and can be considered as a low priority target. Porosity is associated with the pore-filling bitumen and it is mostly occurring as porosity associated with the organic matter, as visible in the SEM pictures. X-Ray diffraction results show that the formation mineralogy is primarily calcite and dolomite, with variable amount of quartz, clay and pyrite. The main clay minerals are illite and smectite. The concentration of some rare elements such as vanadium, nickel and molybdenum is relatively high (626, 730, 1342 ppm respectively) in the organic rich layers. Higher percentage of carbonate and lower percentage of clay makes this formation brittle and prone for fracking to extract any fluid trapped in these unconventional and less permeable rocks. The prospective interval of Najmah Unit III is found to be lower in clay content with an average concentration of (1.5 %). In the west Kuwait fields, there is a lateral increasing trend in TOC content from south to north. Thus, high TOC values are in the Dharif Field 18% wt. and the lower values are in the Umm Gudair Field. The unconventional hydrocarbon potential of Najmah U nit III interval is best in the Dharif oil Field.
Appears in Programs:0460 Geology

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