Improved Initial Water Saturation Distribution for a Three-Dimensional Model

Prickett, H.D.; Bremer, R.E.

doi:10.2118/17958-ms

Cited by 7 publications

(2 citation statements)

References 1 publication

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“…A significant amount of work to generate saturation height functions is available in the literature [1][2][3] . These functions calculates Sw based on one or more of the parameters like porosity, oil water contact, gas water contact, irreducible water saturation, height above contacts, etc.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Validation of Initial Water Saturation in the Transition Zone of Carbonate Oil Reservoirs

Ghedan¹,

Thiebot²,

Boyd³

2004

Proceedings of Abu Dhabi International Conference and Exhibition

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Section: Introductionmentioning

confidence: 99%

Modeling and Validation of Initial Water Saturation in the Transition Zone of Carbonate Oil Reservoirs

Ghedan¹,

Thiebot²,

Boyd³

2004

Proceedings of Abu Dhabi International Conference and Exhibition

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“…Therefore, In order to calculate saturation-height functions without using core measurements, an alternative method was adopted. A significant amount of work to generate saturation height functions is available in the literature [1][2][3][4][5] . These functions calculates water saturation based on one or more of the parameters like, porosity, oil water contact, gas water contact, irreducible water saturation, height above contact etc.…”

Section: Introductionmentioning

confidence: 99%

Saturation Modeling in a Multilayered Carbonate Reservoir Using Log-Derived Saturation-Height Function

et al. 2002

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe conventional and widely used way of distributing saturation arrays in reservoir simulation models is through porosity-weighted water saturation values. In this way, each grid cell has an assigned porosity and initial water saturation. The porosity and water saturation are estimated with the help of well logs using established procedures. However, for producing reservoirs, log derived saturations may not represent initial saturations due to various reasons like depletion due to production and effect of water injection etc. One of the ways to estimate the initial water saturation is by the use of relationship between depth and bulk volume of water (BVW). Such relationship, known as Saturation-Height function is used to estimate saturation values away from the well locations and to calculate the hydrocarbons in place volumetrically. This approach has been used in a multi layered carbonate reservoir of an Indian offshore field. Layer-wise saturation height functions are developed by establishing relationships between height above the free water level and bulk volume of water derived from the wells drilled in the initial phase of field development. The scatter in the BVW plot has been reduced by further classifying the data for different porosity facies. These porosity intervals are treated as rock types for that layer. Since each layer has a particular range of porosity, different porosity based rock types are identified. Height above the free water level versus water saturation plots are then generated for different rock types using the relationship developed for each geological layer.These equations were used to assign initial water saturation in the reservoir simulation model.

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Quantification of the Distribution of Initial Water Saturation through Leverett J Function to Calculate Hydrocarbon Reserves

Gonzalez

Perozo

Medina

2016

Day 2 Thu, October 20, 2016

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Generally, hydrocarbon reserves are determined by the irreducible water saturation using the volumetric equation of the original oil in place (OOIP), regardless of the initial water saturation in the transition zone and as a result overestimate hydrocarbon reserves. The objective of this work is to determine a water saturation model that allows modeling the initial distribution of fluids in the reservoir knowing the original oil-water contact and rock quality. The Leverett J function was used as a variable independent from initial water saturation model; it controls the flow of fluid and depends on the height above the free water level, the interfacial tension, Oil-water fluid density, absolute permeability and effective porosity. In order to define this function, capillary pressure data from oil-water system of drain cycle from special core analysis were used. The core data were modeled and averaged for each rock type with the capillary pressure function from "JNM Jing XD Van Wunnik SCA-9807 (1998)". Then, these curves were converted to values of "J" and these were related with water saturation from capillary pressure curves to obtain functions type SWINIT: f (J). This model gave excellent results in the fluid initial behavior, it means, knowing the original oil-water contact and rock quality, the initial water saturation was quantified in in wells completed in the reservoir. The aforementioned was validated with production / pressure tests. Finally, two sensitivities were performed to calculate OOIP, the first was determined with the irreducible water saturation and the second with the initial water saturation, resulting in a error difference about 5%, in this case, obtaining higher reserves were the calculated with irreducible water saturation. The initial water saturation profile of the wells generated from the model, it is useful to initialize the numerical simulation from reservoir "A", because this model takes as an input data the original oil water contact, which represents the limit reservoir fluid. This model does not depend on the date of drilling wells to determine the initial water saturation of the reservoir.

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Improved Initial Water Saturation Distribution for a Three-Dimensional Model

Cited by 7 publications

References 1 publication

Modeling and Validation of Initial Water Saturation in the Transition Zone of Carbonate Oil Reservoirs

Modeling and Validation of Initial Water Saturation in the Transition Zone of Carbonate Oil Reservoirs

Saturation Modeling in a Multilayered Carbonate Reservoir Using Log-Derived Saturation-Height Function

Quantification of the Distribution of Initial Water Saturation through Leverett J Function to Calculate Hydrocarbon Reserves

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