Late Pliocene Sapphire Sand Reservoirs Characterization Using Nuclear Magnetic Resonance: Sapphire-1 well, Case Study, WDDM, Egypt
Journal Title: Petroleum & Petrochemical Engineering Journal - Year 2017, Vol 1, Issue 5
Abstract
This paper documents first deployment of new Magnetic Resonance (NMR) approach for characterizing late-Pliocene complex shaly sandstone reservoirs Sapphire field. Use of conventional logs like Gamma ray, Density, Neutron and Sonic for the reservoir characterization in these reservoirs pose challenges due to its lithological complexity and hetrogenity. The Pliocene delta slope-channel play (Sapphire Field) reservoirs are a shaly sandstone reservoir with vertical and lateral heterogeneous properties. The clay content in such reservoirs causes overestimation of the shale volume and overestimation of the formation porosity leading to inaccurate identification of lithology and estimation of the formation fluids using the conventional logs. Therefore, the porosity independent lithology Magnetic Resonance logging measurement was acquired in dual-wait time enabled T2 polarization mode to differentiate between moveable water and hydrocarbons. After acquisition, standard deliverables were porosity and permeability index with the porosity divided into clay-bound water (CBW), bulk-volume irreducible (BVI) and bulk-volume moveable (BVM) components. The rock quality was interpreted based using permeability index and effective porosity ratio, and classified based on its gradients, to identify the high, medium to low, and tight flow unit zones. The steeper ratio gradient was interpreted as high flow, gentle gradient as medium to low flow and flat gradient as tight flow zones. Based on the NMR flow units and fluid types (CBW, BVI and BVM), the drilled interval was classified into ten compartments of high flow, eleven compartment of medium to low flow along with three tight compartments. The relationship between storage and flow capacities for these compartment intervals revealed that, whereas the high flow units only have 19 % of the total storage capacity, they contribute over 70% of the total flow capacity, while the medium to low flow units containing 71% of the total storage deliver 29% of the total flow capacity, finally the tight flow units have 10 % of the total storage and 1 % of the total flow. NMR data acquisition and processing has added value for reservoir characterization in this challenging shaly sand reservoirs by distinguishing tight and movable hydrocarbon bearing zones in terms of flow and storage units, and quantification of their storage and flow capacity leading to the determination of sapphire reservoirs true hydrocarbon reserves and production potential.
Authors and Affiliations
Mahmoud Fawzy Shehab El Dien
Keywords
Related Articles
- EP ID EP597017
- DOI -
- Views 69
- Downloads 0
Investigation of the Impact of Scale Inhibitors: Ethoxylated 1-Octanol and Methylcyclohexanol for Scale Deposition Control in Oilfield
In this work two non-ionic surfactants (1-Octanol ethoxylate (OE-8.7) and Methylcyclohexanol ethoxylate (MCHE-9) were prepared by the reaction of their hydrophobs with ethylene oxide for used as a novel scale inhibitors...
Effect of Inhibitors with Aromatic Solvents towards the Flow Properties of Crude Oil
Petroleum industry which is well known for its growth facing a major issue in transporting crude oil in the pipeline. The major issue which disrupts the flow in the pipeline is due to the fluctuation of the temperature g...
Evaluation of Waterflooding; Experimental and Simulation Overview
Water flooding is very important in the oil field, therefore the research is designed to evaluate the water flooding design for oil reservoir in order to monitor the impact of water flooding on reservoir performance and...
Air-Water Two-Phase Flow through Small Diameter Pipes
In this study, the flow patterns of air - water, two-phase flows have been investigated experimentally in a vertical and horizontal milli channel. The flow regimes were observed by a high speed video recorder in pipes wi...
Petroleum Feed Stock for Present Needs and Future Challenges
Petroleum and petroleum derived products are inseparable part in human life. The variety of petroleum products ranges from cosmetic to industrial chemicals. Hence it is impossible to sustain the human life without the pe...