Refinement of a Geological Reservoir Model by Detailed Correlation
- Aliya Mubarakova (TGT Oil and Gas Services) | V. Sudakov (TGT Oil and Gas Services) | S. Sidorov (TGT Oil and Gas Services)
- Document ID
- Society of Petroleum Engineers
- SPE Russian Oil and Gas Exploration and Production Technical Conference and Exhibition, 16-18 October, Moscow, Russia
- Publication Date
- Document Type
- Conference Paper
- 2012. Society of Petroleum Engineers
- 4.1.5 Processing Equipment, 5.1.5 Geologic Modeling, 5.6.1 Open hole/cased hole log analysis, 1.14 Casing and Cementing, 3.3.1 Production Logging, 2.4.3 Sand/Solids Control, 1.2.3 Rock properties, 4.1.2 Separation and Treating, 5.1.1 Exploration, Development, Structural Geology, 4.2.3 Materials and Corrosion
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It is very important to understand sedimentation in detail, both from the aspect of geological or petrophysical modelling and field development.
The correctly inferred distribution of a stratigraphic layer's boundaries pre-determines the fluid flow produced by the model to be close to the actual flow. Activities to enhance residual oil recovery are more effective if planned according to the detailed stratification, which means understanding of the geologic aspects of a single area.
The entire knowledge of region's geology and stratigraphy, and any available field data are applied during the correlation and almost all applicable open-hole logging techniques are useful for the purpose of correlation.
The correlation itself is optimised, split into stages and sub-stages to save time and minimise errors.
An algorithm was developed for the purposes of detailed correlation.
Based on the detailed correlation and problems related to this process, the history of deposition was successfully reconstructed.
The realised area-specific distribution of reserves varies significantly when compared to the previous interpretation.
Detailed correlation results enabled thickness maps to be constructed for each of the sublayers and were used for the purposes of matching the hydrodynamic model.
Each sublayer was then scheduled for extraction of residual oil.
A great number of production logging techniques have been used to develop fields further, with this paper discussing High-Precision Temperature and Spectral Noise Logging surveys, to identify production and injection profiles and to analyse them vertically.
Fluid in many cases was injected into one subzone while a nearby well produced the fluid from another one. Fluid production strongly varied within the field. Some producers did not respond to the pressure build-up caused by injection.
All this suggests that reservoir splitting into two large subzones needs to be revised.
Geologic and tectonic frameworks are required to have a detailed stratigraphic column.
Knowledge of rock composition and their degree and type of cementation is essential.
Description of geology of the exploration area
The Severnoye field is located in Western Siberia. According to the drilling logs, the field has thick (up to 2.7-3 km) terrigenous sand-silt and clay rocks of Mesozoic-Cainozoic sedimentary cover overlying Triassic argillo-arenaceous rocks, shale, basalts and limestones with angular and stratigraphic unconformities.
Tectonically, the structure sits on a minor arch complicated by large mounds. The arch is an anticline fold running northward across an area roughly 20 x 7.5 km with altitude differences exceeding 100 metres.
The fold has three local uplifts: The northern, the middle and the southern uplifts that are separated by shallow (10-15 metres) saddles and structural lows.
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