Developing a workflow to represent fractured carbonate reservoirs for simulation models under uncertainties based on flow unit concept
Description of fractured reservoir rock under uncertainties in a 3D model and integration with reservoir simulation is still a challenging topic. In particular, mapping the potential zones with a reservoir quality can be very useful for making decisions and support development planning. This mapping...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2019-01-01
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| Series: | Oil & Gas Science and Technology |
| Online Access: | https://ogst.ifpenergiesnouvelles.fr/articles/ogst/full_html/2019/01/ogst180310/ogst180310.html |
| _version_ | 1818648725642280960 |
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| author | Mahjour Seyed Kourosh Gomes Correia Manuel de Souza dos Santos Antonio Alberto Schiozer Denis José |
| author_facet | Mahjour Seyed Kourosh Gomes Correia Manuel de Souza dos Santos Antonio Alberto Schiozer Denis José |
| author_sort | Mahjour Seyed Kourosh |
| collection | DOAJ |
| description | Description of fractured reservoir rock under uncertainties in a 3D model and integration with reservoir simulation is still a challenging topic. In particular, mapping the potential zones with a reservoir quality can be very useful for making decisions and support development planning. This mapping can be done through the concept of flow units. In this paper, an integrated approach including a Hierarchical Cluster Analysis (HCA), geostatistical modeling and uncertainty analysis is developed and applied to a fractured carbonate in order to integrate on numerical simulation. The workflow begins with different HCA methods, performed to well-logs in three wells, to identify flow units and rock types. Geostatistical techniques are then applied to extend the flow units, petrophysical properties and fractures into the inter-well area. Finally, uncertainty analysis is applied to combine different types of uncertainties for generating ensemble reservoir simulation models. The obtained clusters from different HCA methods are evaluated by the cophenetic coefficient, correlation coefficient, and variation coefficient, and the most appropriate clustering method is used to identify flow units for geostatistical modeling. We subsequently define uncertainties for static and dynamic properties such as permeability, porosity, net-to-gross, fracture, water-relative permeability, fluid properties, and rock compressibility. Discretized Latin Hypercube with Geostatistical (DLHG) method is applied to combine the defined uncertainties and create an ensemble of 200 simulation models which can span the uncertainty space. Eventually, a base production strategy is defined under operational conditions to check the consistency and reliability of the models created with UNISIM-II-R (reference model) as a real reservoir with known results. Results represent the compatibility of the methodology to characterize fractured reservoirs since those models are consistent with the reference model (used to generate the simulation models). The proposed workflow provides an efficient and useful means of supporting development planning under uncertainty. |
| first_indexed | 2024-12-17T01:23:00Z |
| format | Article |
| id | doaj.art-88b3c8a8b2e747b2a0fa47a4c2ed0054 |
| institution | Directory Open Access Journal |
| issn | 1294-4475 1953-8189 |
| language | English |
| last_indexed | 2024-12-17T01:23:00Z |
| publishDate | 2019-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | Oil & Gas Science and Technology |
| spelling | doaj.art-88b3c8a8b2e747b2a0fa47a4c2ed00542022-12-21T22:08:46ZengEDP SciencesOil & Gas Science and Technology1294-44751953-81892019-01-01741510.2516/ogst/2018096ogst180310Developing a workflow to represent fractured carbonate reservoirs for simulation models under uncertainties based on flow unit conceptMahjour Seyed KouroshGomes Correia Manuelde Souza dos Santos Antonio AlbertoSchiozer Denis JoséDescription of fractured reservoir rock under uncertainties in a 3D model and integration with reservoir simulation is still a challenging topic. In particular, mapping the potential zones with a reservoir quality can be very useful for making decisions and support development planning. This mapping can be done through the concept of flow units. In this paper, an integrated approach including a Hierarchical Cluster Analysis (HCA), geostatistical modeling and uncertainty analysis is developed and applied to a fractured carbonate in order to integrate on numerical simulation. The workflow begins with different HCA methods, performed to well-logs in three wells, to identify flow units and rock types. Geostatistical techniques are then applied to extend the flow units, petrophysical properties and fractures into the inter-well area. Finally, uncertainty analysis is applied to combine different types of uncertainties for generating ensemble reservoir simulation models. The obtained clusters from different HCA methods are evaluated by the cophenetic coefficient, correlation coefficient, and variation coefficient, and the most appropriate clustering method is used to identify flow units for geostatistical modeling. We subsequently define uncertainties for static and dynamic properties such as permeability, porosity, net-to-gross, fracture, water-relative permeability, fluid properties, and rock compressibility. Discretized Latin Hypercube with Geostatistical (DLHG) method is applied to combine the defined uncertainties and create an ensemble of 200 simulation models which can span the uncertainty space. Eventually, a base production strategy is defined under operational conditions to check the consistency and reliability of the models created with UNISIM-II-R (reference model) as a real reservoir with known results. Results represent the compatibility of the methodology to characterize fractured reservoirs since those models are consistent with the reference model (used to generate the simulation models). The proposed workflow provides an efficient and useful means of supporting development planning under uncertainty.https://ogst.ifpenergiesnouvelles.fr/articles/ogst/full_html/2019/01/ogst180310/ogst180310.html |
| spellingShingle | Mahjour Seyed Kourosh Gomes Correia Manuel de Souza dos Santos Antonio Alberto Schiozer Denis José Developing a workflow to represent fractured carbonate reservoirs for simulation models under uncertainties based on flow unit concept Oil & Gas Science and Technology |
| title | Developing a workflow to represent fractured carbonate reservoirs for simulation models under uncertainties based on flow unit concept |
| title_full | Developing a workflow to represent fractured carbonate reservoirs for simulation models under uncertainties based on flow unit concept |
| title_fullStr | Developing a workflow to represent fractured carbonate reservoirs for simulation models under uncertainties based on flow unit concept |
| title_full_unstemmed | Developing a workflow to represent fractured carbonate reservoirs for simulation models under uncertainties based on flow unit concept |
| title_short | Developing a workflow to represent fractured carbonate reservoirs for simulation models under uncertainties based on flow unit concept |
| title_sort | developing a workflow to represent fractured carbonate reservoirs for simulation models under uncertainties based on flow unit concept |
| url | https://ogst.ifpenergiesnouvelles.fr/articles/ogst/full_html/2019/01/ogst180310/ogst180310.html |
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