Implementation of High Resolution Diagenetic Features into the Static and Dynamic Reservoir Models of a Giant Offshore Oil Field, Abu Dhabi
| Autor: | Rolf Herrmann, Dachang Li, Ewart Edwards, Chukwudi Obeta, Budoor Hasan Al Shehhi, Ravi Shekhar, Gary Ottinger, Abdulla Al Neyadi, Zinab N. Al Maqrami, Hesham Shebl, Ayub Fazal, Amna Al Naqbi, Tomohiro Obara, Shamsa J. Almazrouei |
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| Rok vydání: | 2017 |
| Předmět: |
Abu dhabi
Petroleum engineering 020209 energy 0202 electrical engineering electronic engineering information engineering High resolution Submarine pipeline 02 engineering and technology Oil field 010502 geochemistry & geophysics 01 natural sciences Geology 0105 earth and related environmental sciences Diagenesis |
| Zdroj: | Day 3 Wed, November 15, 2017. |
| Popis: | Lower Cretaceous-aged carbonate sediments in a supergiant Middle Eastern oil field are characterized by extensive diagenetic overprints (e.g., dolomitized burrows, dissolution fabrics and fractures) which occur over areas of several kilometers. Due to the permeability contrast with respect to surrounding fine-grained matrix, the diagenetic features are believed to play an important role in reservoir fluid-flow, particularly as a major contributor to early water breakthrough observed in the field. Uncertainties associated with three-dimensional subsurface reservoir models can be mitigated by incorporating the results of detailed reservoir characterization studies. How these study findings are successfully and meaningfully implemented into the reservoir model can be a challenge and requires an integrated effort by reservoir geologists, modelers, and engineers. This paper discusses a comprehensive reservoir characterization and modeling study conducted to capture the impact of diagenetic features on reservoir flow properties. A novel method was developed to map the spatial and stratigraphic distribution of these features from cores. Dolomitized burrows generally appear in core as randomly oriented features on a scale of cm to 10's of cm. They are characterized by grainier fill (packstone or grainstone), often dolomitized, within a background of muddier sediment (wackestone to packstone). Dissolution vugs are associated with algal rock type and can vary from few cms to 10's of cm. Fractures are generally layer specific and occur at the reservoir-dense boundaries. The origin of diagenetic processes and prediction of their occurrence is very difficult. However, the difference in texture and associated pore characteristics lead to heterogeneous porosity and permeability regimes that can have significant impact on sweep efficiency and recovery in oil fields that are subjected to waterflood. A simplified, fit-for-purpose, rapidly updateable static model has been developed to ensure accurate stratigraphic and lateral distribution of diagenetic features based on cores, logs and dynamic data. Whole core data revealed potential guidance for assigning permeability in diagenetic features. A consistent SCAL framework has been developed to capture the relative effects of these diagenetic features on flow. After incorporation in the model, simulation results clearly shows water movement through these features and rapid water cut. This is in agreement to the field observation that has experienced earlier than expected water breakthrough and steady increases in water cut over time. |
| Databáze: | OpenAIRE |
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