Gasfields, Nw German Basin: Secondary Gas Migration as a Major Geologic Parameter

Abstract

The observable concentration of the major deep gas accumulation areas in the NW German Basin is the result of focused secondary migration. Gas generated in several effective depocenters (regional structural lows) from Late Carboniferous source beds migrated into adjacent regional structural highs. The preferred migration paths are qualitatively predictable on the basis of present basin geometry. Optimal conditions for gas accumulations exist where the presently trapping regional highs have also been sites of favorable reservoir development. On‐going and future deep‐gas exploration efforts in the basin can be regarded as quite hopeful.

The origin and distribution of crude oil in Zhu III sub-basin, Pearl River Mouth Basin, China

“…A C C E P T E D ACCEPTED MANUSCRIPT (Dembicki and Anderson, 1989;Hindle, 1989Hindle, , 1997Catalan et al, 1992;Thomas and Clouse, 1995), and structural morphology is the most important factor that controls the positions of petroleum migration pathways in sedimentary basins (Pratsch, 1983(Pratsch, , 1986(Pratsch, , 1994Hindle, 1997).…”

Preferential petroleum migration pathways in eastern Pearl River Mouth basin, offshore South China Sea

“…A number of workers believed that the migration pathways in heterogeneous carrier beds are primarily controlled by permeability heterogeneities, with petroleum preferentially migrating through carrier-bed portions with relatively high permeability (e.g., Bekele et al, 2002Bekele et al, , 1999Rhea et al, 1994). Many others believed that, even in heterogeneous carrier beds, the petroleum migration pathways are controlled largely by structural morphology (Hindle, 1997;Pratsch, 1994Pratsch, , 1988Pratsch, , 1986Pratsch, , 1983Momper and Williams, 1984).…”

“…Therefore, they are difficult to effectively predict because of complications with characterizing permeability heterogeneity related to the extent of fracture permeability and permeability alteration due to diagenesis (Bekele et al, 2002). Nevertheless, others believed that petroleum migration pathways are controlled largely by structural morphology (Hindle, 1997;Pratsch, 1994Pratsch, , 1988Pratsch, , 1986Pratsch, , 1983Momper and Williams, 1984), and modeling of petroleum migration pathways can be a powerful tool to reduce exploration risk (Hindle, 1999(Hindle, , 1997Hermans et al, 1992;Sylta, 1991).…”

Petroleum migration and accumulation in the Bozhong sub-basin, Bohai Bay basin, China: Significance of preferential petroleum migration pathways (PPMP) for the formation of large oilfields in lacustrine fault basins

“…The ''restrainingforce school'' considers the migration pathway as a sheetlike migrating petroleum front (Rhea et al, 1994), and believes that the positions of petroleum migration pathways are largely controlled by permeability heterogeneity of the carrier beds (e.g., Rhea et al, 1994;Bekele et al, 1999Bekele et al, , 2002 and are therefore difficult to effectively predict because of complications with characterizing permeability heterogeneity related to the extent of fracture permeability and permeability alteration due to diagenesis (Bekele et al, 2002). By contrast, the ''driving-force school'' views petroleum migration pathways as very restricted rivers or streams (Gussow, 1954(Gussow, , 1968Dembicki and Anderson, 1989;Catalan et al, 1992;Thomas and Clouse, 1995; Hindle, 1989Hindle, , 1997, and believes that the positions of petroleum migration pathways in sedimentary basins are controlled largely by structural morphology (Gussow, 1968;Momper, 1978;Momper and Williams, 1984;Pratsch, 1983Pratsch, , 1986Pratsch, , 1988Pratsch, , 1994Hindle, 1997), and believes that modeling of petroleum migration pathways can be a powerful tool to reduce exploration risk (Sylta, 1991;Hermans et al, 1992;Hindle, 1997Hindle, , 1999.…”