Case History 4 3-D Seismic Interpretation of an Upper Permian Gas Field in Northwest Germany
H. E. C. Swanenberg, F. X. Fuehrer, 2011. "Case History 4 3-D Seismic Interpretation of an Upper Permian Gas Field in Northwest Germany", Interpretation of Three-Dimensional Seismic Data, Alistair R. Brown
Download citation file:
In northwest Germany, sour gas is produced from Zechstein (Upper Permian) carbonates in a number of mainly medium-sized fields. A 3-D survey was acquired in 1985 to optimize drilling in the Goldenstedt field and some smaller adjacent fields (Figure 14-4-1). Recent appraisal drilling has proved significantly more potential than originally assumed in this area of complex structure and facies. Total reserves are currently estimated at 0.5 tcf of sour gas with an H2S content varying between 7 and 26%.
Structural definition and resolution of the target horizon at 3500 to 4000 m depth (corresponding to 2.2 to 2.4 sec two-way traveltime) is severely influenced by lateral velocity variations in the overburden, which complicated processing and interpretation of the survey. Despite nominally lower coverage than regular 2-D, the superiority of 3-D data significantly enhanced structural control. Some information on the reservoir was also obtained from reflection amplitudes. The 3-D data set thus revealed details of the tectono-depositional framework not observed on previous 2-D data.
Figures & Tables
This publication is the definitive, and now classic, text on the subject of interpretation of 3-D seismic data. Conceived in 1979 and first published in 1986, the book helps geoscientists extract more information from their seismic data and improve the quality of their interpretations.