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Petroleum Geoscience Conference & Exhibition 2013
- Conference date: 18 Mar 2013 - 19 Mar 2013
- Location: Kuala Lumpur, Malaysia
- Published: 18 March 2013
101 - 103 of 103 results
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Organic Geochemical Characteristics of The Lower Cretaceous Abu Gabra Sediments in The Great Moga Oilfield, Muglad Basin
Authors Y.M. Makeen A., W. Hasiah Abdullah and M. Hail HakimiA selection of biomarkers were used to establish the maturity of the organic matter and to help in the interpretation of the depositional environment of the Lower Cretaceous Abu Gabra extracts. The biomarker distributions are characterized by dominant low to medium molecular weight compounds, moderately high Pr/Ph ratio (1.02-2.29), high abundance of C27 regular sterane and presence of tricyclic terpanes, indicating a high degree of marine derived organic matter deposited under suboxic conditions. A small amount of terrigenous organic matter is, however, present as indicated by the presence of waxy alkanes (n-C25 to n-C34) thus gave moderate CPI values > 1.10. On the basis of biomarker maturity parameters, such as (22S/22S+22R) C32 homohopane values of 0.54 to 0.63 which suggest these samples are thermally mature and have entered early mature to peak oil window generation range.
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Petroleum Source Rock Kinetics of Outcrop Analogues, NW Sabah Basin, East Malaysia from Non-Isothermal Open System Pyrolysis
By P. GouThis study discusses the application of a non-isothermal open system pyrolysis method using Source Rock Analyzer-Kinetics (SRA-Kinetics) to characterise and predict the hydrocarbon generation profile of Tertiary rock samples mainly from the NW Sabah Basin, East Malaysia. SRA-Kinetics data of onshore outcrop samples from NW Sabah, East Malaysia reveal that most of the samples have a wide distribution of activation energies (Ea) that are usually associated with Type III terrigenous organic matter. That property implies that similar source rocks in the subsurface would also have a wider window for hydrocarbon generation, compared to Type I source rocks. This increases the probability of filling structures with hydrocarbons, as long as they were formed within the wide hydrocarbon generating window. The distribution of activation energies in the slump deposits associated with the West Crocker Formation has a strong resemblance to the younger Belait Formation. Backed up by vitrinite reflectance thermal maturity data and recently obtained biostratigraphic data, it is proposed that these slump deposits were derived from younger geological units that were eroded and re-deposited over older geological units such as the West Crocker Formation.
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Improving Performance in A Mature Field: Integrated Analysis For Identification and Optimization of Low-Resistivity Hydrocarbon- Bearing Sand Reservoirs in Semberah Field, Mahakam Delta
Authors M.R. Hakim, L.P. Gultom and G.A. DharmawanLow resistivity pay zones still leaving significant reserves in Semberah and currently contribute to Semberah production. Combination factor of bed thickness, grain size, conductive mineral, and clay mineral are dominant reason to lower the resistivity in Semberah. However, structural dip becomes less affected to low resistivity because of low angle structural dip in Semberah. In particular, Clean sand with low resistivity most likely affected by conductive minerals, while shaly sand controlled by presence of clay minerals. Numerous potential zones has been discovered from F to I interval. The main candidates coming from G and I interval with depth in between 6000 – 9000 ft in average. Integrated approach to low resistivity pay zone becomes important to overcome declining trend in production, and also to optimise bypassed zone in Semberah.
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