10,351
edits
Changes
Jump to navigation
Jump to search
Line 42:
Line 42: + + Line 47:
Line 49: − + − − [[file:subsurface-maps_fig4.png|thumb|{{figure number|4}}(a) Cross section and (b) net pay Isopach map of the Strachan gas field, western Canada. Contour Interval is 100 ft. (From <ref name=pt06r55>Hriskevich, M. E., Faber, J. M., Langton, J. R., 1980, Strachan and Ricinus West gas fields, Alberta, Canada, in Halbouty, M. T., ed., Giant Oil and Gas Fields of the Decade 1968–1978: AAPG Memoir 30, p. 315–327.</ref>.)]]
→Mapping thicknesses
==Mapping thicknesses==
==Mapping thicknesses==
[[file:subsurface-maps_fig4.png|thumb|{{figure number|4}}(a) Cross section and (b) net pay Isopach map of the Strachan gas field, western Canada. Contour Interval is 100 ft. (From <ref name=pt06r55>Hriskevich, M. E., Faber, J. M., Langton, J. R., 1980, Strachan and Ricinus West gas fields, Alberta, Canada, in Halbouty, M. T., ed., Giant Oil and Gas Fields of the Decade 1968–1978: AAPG Memoir 30, p. 315–327.</ref>.)]]
Interpretations of depositional trends, pre- and syndepositional structural development, and reservoir storage capacity are based in large part on thickness information. An accurate meaning of thickness is critical in these and other analyses (see “Conversion of Well Log Data to Subsurface Stratigraphic and Structural Information”).
Interpretations of depositional trends, pre- and syndepositional structural development, and reservoir storage capacity are based in large part on thickness information. An accurate meaning of thickness is critical in these and other analyses (see “Conversion of Well Log Data to Subsurface Stratigraphic and Structural Information”).
===Isopach===
===Isopach===
A contour map of equal values of true stratigraphic thickness is an ''isopach map'' (Figure 4). Except for vertical wells in horizontal beds, corrections for wellbore deviation and formation dip are needed to make isopach maps.
A contour map of equal values of true stratigraphic thickness is an ''isopach map'' ([[:file:subsurface-maps_fig4.png|Figure 4]]). Except for vertical wells in horizontal beds, corrections for wellbore deviation and formation dip are needed to make isopach maps.
===Isochore===
===Isochore===