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Search Carbonate reservoirs: PetroWiki
...ead External links Use this section to provide links to relevant material on websites other than PetroWiki and OnePetro See also Waterflooding...
San Andres and Clearfork are two carbonate reservoir intervals that are present over a considerable area of the Permian Basin in west Texas. These reservoirs (e.g., Wasson, Slaughter, Seminole) contain several billion bbl of approximately 30 API oil. They are very-layered, heterogeneous carbonates and dolomites that have large variation in permeability from layer to layer. Interestingly, because of the complex hydrocarbon-accumulation history of this basin, much of this area has an underlying interval that contains residual oil saturation. Most of these reservoirs were discovered in the late 1930s and the 1940s.
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- North America > United States > Texas > Permian Basin > Yates Formation (0.99)
- North America > United States > Texas > Permian Basin > Wolfcamp Formation (0.99)
- (24 more...)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Carbonate reservoirs (0.75)
- Reservoir Description and Dynamics > Improved and Enhanced Recovery > Waterflooding (0.63)
- Reservoir Description and Dynamics > Improved and Enhanced Recovery > Reduction of residual oil saturation (0.61)
- Information Technology > Knowledge Management (0.41)
- Information Technology > Communications > Collaboration (0.41)
...ead External links Use this section to provide links to relevant material on websites other than PetroWiki and OnePetro See also Reservoir geology Siliciclastic reservoir geology PEH:Reservoir_Geology...
Carbonate sediments are commonly formed in shallow, warm oceans either by direct precipitation out of seawater or by biological extraction of calcium carbonate from seawater to form skeletal material. The result is sediment composed of particles with a wide range of sizes and shapes mixed together to form a multitude of depositional textures. The sediment may be bound together by encrusting organisms or, more commonly, deposited as loose sediment subject to transport by ocean currents. A basic overview of carbonate-reservoir model construction was presented by Lucia,[1] and much of what is presented herein is taken from that book. Depositional textures are described using a classification developed by Dunham. The loose sediment cannot be described in simple terms of grain size and sorting because shapes of carbonate grains can vary from spheroid ooids to flat-concave and high-spiral shells having internal pore space.
- Geology > Sedimentary Geology > Depositional Environment > Transitional Environment > Tidal Flat Environment (1.00)
- Geology > Sedimentary Geology > Depositional Environment > Marine Environment (1.00)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock (1.00)
- Geology > Mineral (1.00)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Carbonate reservoirs (1.00)
- Reservoir Description and Dynamics > Reservoir Characterization > Sedimentology (0.78)
- Information Technology > Knowledge Management (0.40)
- Information Technology > Communications > Collaboration (0.40)
The Impact of Fractures on Producibility and Completions in a Heavy Oil Carbonate Reservoir
Adole, Sunday (Chevron U.S.A. Inc.) | Li, Ting (Chevron U.S.A. Inc.) | Se, Yegor (Chevron U.S.A. Inc.) | Wilkinson, Peter (Chevron U.S.A. Inc.) | Ranson, Andrew (Chevron U.S.A. Inc.) | Azobu, Joshua (Chevron U.S.A. Inc.) | Turner, Jim (Chevron U.S.A. Inc.) | Gumilar, Bambang (Chevron U.S.A. Inc.) | Whittlesey, Karen (Chevron U.S.A. Inc.)
...nal packers and sliding sleeves to isolate individual fracture zones. Ref. Cased hole completions - PetroWiki (spe.org) 17 SPWLA-2023-0064...
ABSTRACT The reservoir under discussion is located between Saudi Arabia and Kuwait. Designing the right completions strategy to minimize water cut has been challenging in the target reservoir. One of the biggest challenges relates to variable hydrocarbon mobility and understanding of production from fractures. Also, there is uncertainty around the initial mobile water saturations in pay zones. Many wells come online with high initial water-cut while other wells show low initial water-cut before a sharp increase in produced water volume within a few months. Previous studies identified fracture production in at least one well based on core observations and production logging. In this paper, we make an integrated analysis of oil production from apparent tight zones with irregular fractures. A rich suite of borehole measurements was acquired across the field. Mud logs, wireline triple combo, formation pressure and fluid samples, core data, image logs, NMR, geochemical logs and production logs (PLT) were collected. Initial production (IP) rates and well tests were utilized to provide the ground truth for our log interpretation. In many wells, oil production does not come from interpreted pay zones, but rather from apparently tight rocks. The conventional wireline logs offered limited insight into how fluids entered the wellbores. Conventional cores revealed vugs and fractures in the rock with an aperture of a several centimeters filled with oil. A production log in one of the wells shows significant inflow of relatively light oil and no water from an impermeable rock matrix. Wireline logs were interpreted in a multi-mineral model to compute rock and fluid volumes. The elemental capture spectroscopy data provided clay concentrations, which led to a more robust porosity and matrix permeability interpretation. Image log processing revealed fracture networks with considerable aperture in zones with fracture production. Interpretation results were validated by core, fluid samples, mud logs and production data (PLT, Well tests). Ongoing assessment of fracture related production and improved understanding of the role vugular zones and matrix permeability contribute to fluid mobility is key to future development. The significance of this work is that it presents a multidisciplinary approach, combining openhole and casedhole petrophysics, to optimize producibility and completions.
- North America > United States > Texas (1.00)
- Asia > Middle East (1.00)
- Geology > Geological Subdiscipline (1.00)
- Geology > Rock Type > Sedimentary Rock > Carbonate Rock (0.46)
- Geology > Petroleum Play Type > Unconventional Play > Heavy Oil Play (0.41)
- Geology > Mineral > Silicate > Phyllosilicate (0.34)
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- North America > United States > Texas > Permian Basin > Yates Formation (0.99)
- North America > United States > Texas > Permian Basin > Wolfcamp Formation (0.99)
- (22 more...)
- Reservoir Description and Dynamics > Unconventional and Complex Reservoirs > Carbonate reservoirs (1.00)
- Reservoir Description and Dynamics > Formation Evaluation & Management > Open hole/cased hole log analysis (1.00)