Changes

  | part    = Predicting the occurrence of oil and gas traps

  | part    = Predicting the occurrence of oil and gas traps

  | chapter = Evaluating top and fault seal

  | chapter = Evaluating top and fault seal

  | frompg  = 10-1

  | frompg  = 10-38

  | topg    = 10-94

  | topg    = 10-38

  | author  = Grant M. Skerlec

  | author  = Grant M. Skerlec

  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch10/ch10.htm

  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch10/ch10.htm

  | isbn    = 0-89181-602-X

  | isbn    = 0-89181-602-X

}}

}}

A [[migration]] pathway map is a fundamental tool for prospect assessment and field development. In simple migration pathway maps, arrows are drawn perpendicular to structural [[contour]]s. However, migration pathway maps must also define those [[Fault trap regime|faults]] and those parts of faults that juxtapose sand with sand as well as those faults that [[Cross-sealing faults|cross-seal]] or [[Cross-leaking faults|cross-leak]] and [[Dip-sealing faults|dip-seal]] or [[Dip-leaking faults|dip-leak]].

A [[migration]] pathway map is a fundamental tool for prospect assessment and field development. In simple [[migration pathway]] maps, arrows are drawn perpendicular to structural [[contour]]s. However, migration pathway maps must also define those [[Fault trap regime|faults]] and those parts of faults that juxtapose sand with sand as well as those faults that [[Cross-sealing faults|cross-seal]] or [[Cross-leaking faults|cross-leak]] and [[Dip-sealing faults|dip-seal]] or [[Dip-leaking faults|dip-leak]].

==Requirements for map construction==

==Requirements for map construction==

|-

|-

| Structure–depth maps

| Structure–depth maps

| Defines buoyant vectors for hydrocarbon migration

| Defines buoyant vectors for [[hydrocarbon migration]]

|-

|-

| [[Fault plane profile construction|Fault plane profile]]

| [[Fault plane profile construction|Fault plane profile]]

|-

|-

| Quantitative fault plane analysis

| Quantitative fault plane analysis

| Defines real JLLPs, areas of cross-seal or cross-leak, and areas of dip seal or dip leak

| Defines real JLLPs, areas of cross-seal or cross-leak, and areas of [[dip]] seal or dip leak

|}

|}

[[file:evaluating-top-and-fault-seal_fig10-32.png|300px|thumb|{{figure number|1}}How a fault can control migration pathways across a fault.]]

[[file:evaluating-top-and-fault-seal_fig10-32.png|300px|thumb|{{figure number|1}}How a fault can control migration pathways across a fault.]]

[[:file:evaluating-top-and-fault-seal_fig10-32.png|Figure 1]] illustrates how completely a fault can control [[migration pathways]] across a fault. In this fault plane profile of a fault in a [[Gulf Coast]] field, the shale gouge ratio (SGR) was calculated and contoured only on areas of sand-sand juxtaposition. Areas of sand-shale juxtaposition are uncolored. No hydrocarbon [[migration]] will occur across these uncolored regions or across the sand-shale juxtapositions with low SGRs (blue-purple). These high SGR areas are essentially holes for fluid migration in the fault plane. It will only occur across the areas of sand-sand juxtaposition with high SGRs (red-orange).

[[:file:evaluating-top-and-fault-seal_fig10-32.png|Figure 1]] illustrates how completely a fault can control [[migration pathways]] across a fault. In this fault plane profile of a fault in a [[Gulf Coast]] field, the [[shale gouge ratio (SGR)]] was calculated and contoured only on areas of sand-sand juxtaposition. Areas of sand-shale juxtaposition are uncolored. No hydrocarbon [[migration]] will occur across these uncolored regions or across the sand-shale juxtapositions with low SGRs (blue-purple). These high SGR areas are essentially holes for fluid migration in the fault plane. It will only occur across the areas of sand-sand juxtaposition with high SGRs (red-orange).

==See also==

==See also==

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

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

[[Category:Evaluating top and fault seal]]

[[Category:Evaluating top and fault seal]]