Changes

  | part    = Predicting the occurrence of oil and gas traps

  | part    = Predicting the occurrence of oil and gas traps

  | chapter = Predicting reservoir system quality and performance

  | chapter = Predicting reservoir system quality and performance

  | frompg  = 9-1

  | frompg  = 9-14

  | topg    = 9-156

  | topg    = 9-16

  | author  = Dan J. Hartmann, Edward A. Beaumont

  | author  = Dan J. Hartmann, Edward A. Beaumont

  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch09/ch09.htm

  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch09/ch09.htm

*  No decline while reservoir compacts, then rapid production decline

*  No decline while reservoir compacts, then rapid production decline

|-

|-

| Gravity

| [[Gravity]]

|  

|  

*  Steeply dipping beds or vertical [[permeability]] greater than horizontal  

*  Steeply dipping beds or vertical [[permeability]] greater than horizontal  

*  Fractured reservoir  

*  Fractured reservoir  

*  Low-viscosity oil (in general)  

*  Low-[[viscosity]] oil (in general)  

*  Rapid production decline  

*  Rapid production decline  

*  High recovery rate (75% or more), but often with low recovery volume

*  High recovery rate (75% or more), but often with low recovery volume

==Recoveries of oil vs. gas reservoirs==

==Recoveries of oil vs. gas reservoirs==

The table below shows typical recovery rates for oil vs. gas reservoir systems for different reservoir drive mechanisms with mega and macro port type systems.<ref>John Farina, personal communication, 1998</ref><ref name=ch09r21>Garb, F., A., Smith, G., L., 1987, Estimation of oil and gas reserves, in Bradley, H., B., ed., Petroleum Engineering Handbook: SPE, p. 40-1–40-32.</ref> Recoveries would be lower for meso to micro port systems. Use this table to project the recoveries for your prospects.

The table below shows typical recovery rates for oil vs. gas reservoir systems for different reservoir drive mechanisms with mega and macro port type systems.<ref>Farina, J. personal communication, 1998</ref><ref name=ch09r21>Garb, F. A., and G. L. Smith, 1987, Estimation of oil and gas reserves, in H. B. Bradley, ed., Petroleum Engineering Handbook: SPE, p. 40-1–40-32.</ref> Recoveries would be lower for meso to micro port systems. Use this table to project the recoveries for your prospects.

{| class = "wikitable"

{| class = "wikitable"

|-

|-

! rowspan=2 | Reservoir drive mechanism

! rowspan=2 | Reservoir drive mechanism || colspan=2 | Percent ultimate recovery

! colspan=2 | Percent ultimate recovery

|-

|-

! Gas

! Gas || Oil

! Oil

|-

|-

| Strong water

| Strong water || 30–40 || 45–60

| 30–40

| 45–60

|-

|-

| Partial water

| Partial water || 40–50 || 30–45

| 40–50

| 30–45

|-

|-

| Gas expansion

| Gas expansion || 50–70 || 20–30

| 50–70

| 20–30

|-

|-

| Solution gas

| Solution gas || N/A || 15–25

| N/A

| 15–25

|-

|-

| Rock

| Rock || 60–80 || 10–60

| 60–80

| 10–60

|-

|-

| Gravity drainage

| [[Gravity]] drainage || N/A || 50–70

| N/A

| 50–70

|}

|}

==See also==

==See also==

* [[What is a reservoir system?]]

* [[Reservoir system]]

* [[Analyzing a reservoir system]]

* [[Analyzing a reservoir system]]

* [[Defining flow units and containers]]

* [[Defining flow units and containers]]

[[Category:Predicting the occurrence of oil and gas traps]]  

[[Category:Predicting the occurrence of oil and gas traps]]  

[[Category:Predicting reservoir system quality and performance]] [[Category:Pages with bad references]]

[[Category:Predicting reservoir system quality and performance]] [[Category:Pages with bad references]]