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An isopach map (/ˈaɪsoʊpæk/) illustrates thickness variations within a tabular unit, layer or stratum. Isopachs are contour lines of equal thickness over
Isopach_map
Special-purpose map to show geological features
stratum illustrating the subsurface topographic trends of the strata. Isopach maps detail the variations in thickness of stratigraphic units. It is not
Geological_map
Curve along which a 3-D surface is at equal elevation
Isopach maps use isopachs (lines of equal thickness) to illustrate variations in thickness of geologic units. In discussing pollution, density maps can
Contour_line
Norwegian North Sea oil field
does cause an increase in seismic amplitude which can be used with an isopach map to determine net pay. In the mid-1980s the Ekofisk field as a whole and
Ekofisk_oil_field
Figure 2. Detailed isopach map for Yinggehai basin. Modified after Hoang et al., 2010
Yinggehai_basin
Overview of the industry in Estonia
Seletuskiri" [Kohtla-Järve. Explanation to the maps] (PDF). Eesti Geoloogiakeskus. Geological base map of Estonia (in Estonian). pp. 11–12. Archived from
Oil_shale_in_Estonia
Geologic formation in Australia
Callide Coal Measures, being deposited in a comparatively stable basin. Isopach maps of the Precipice Sandstone indicate two distinct areas of sediment accumulation
Precipice_Sandstone
Geological formation in Montana, United States
stratigraphic units in Montana Paleontology in Montana Law, B.E. (1975). "Isopach map of the Lebo Shale Member, Fort Union Formation" (PDF). Open File Report
Lebo_Member
Oil field in the Gulf of Mexico
recorded from 1966 to 1970, coupled with well data defined lithofacies and isopach maps indicating large delta systems. Relative amplitude seismic profiles reveal
Eugene Island block 330 oil field
Eugene_Island_block_330_oil_field
Mountain-building episode in North America
there was a basement high area gently dipping to the north identified by isopach maps. Thus sediment thickened quickly to the south. To the north strata changed
Sevier_orogeny
Geology, Southern Illinois University Press. Outerbridge, W.F., 2003, Isopach map and regional correlations of the Fire Clay tonstein, central Appalachian
Seatearth
Stratigraphic range in western Canada
Retrieved October 19, 2021. Alberta Geological Survey. "Cardium Formation isopach map with distribution of major Cardium Formation oil and gas fields". Retrieved
Cardium_Formation
Sedimentary rock found in Estonia
An isopach map of the Ordovician graptolitic argillite deposits in northern Estonia, indicating thickness in meters
Graptolitic_argillite
· Claim Maps and Lease Maps · Location Maps · Polygon Maps · Isopach Maps · Strike and Dip Maps Cross Sections ·Litohology ·Stratigraphy ·Interval and
Rockworks
Study of groundwater's movement and distribution
Southwestern Denver Basin, The second report Bedrock Geology, Structure, and Isopach Maps of the Upper Cretaceous to Paleogene Strata between Greeley and Colorado
Hydrogeology
Sedimentary basin located along the coast of southern California
period of deformation. There are many other anticlines within the basin and isopach data suggests that the formation of these folds occurred mostly during
Los_Angeles_Basin
Scientific study of Earth's physical composition
locations of sedimentary facies (lithofacies and biofacies) or the mapping of isopachs of equal thickness of sedimentary rock Surficial mapping: recording the
Geology
Volcanic event in Iceland
and this eruptions vents were just north of this (see Katla for caldera maps). Jökulhlaup flow was initially on the surface as well as subsurface to the
1918_eruption_of_Katla
Concept in oil and gas exploration
even though the reservoir true stratigraphic thickness in that area (or isopach) might be only 10 m, and its true vertical thickness (isochore), 14 m.
Depth_in_a_well
Deposit of material ejected from a volcanic eruption
general trend of pyroclastic dispersal is shown using isopachs (which are analogous to topographic map contours though they illustrate lines of equal thickness
Pyroclastic_fall
Complex volcano in the Cascade Range
Rust, Alison C. (February 6, 2020). "Sources of uncertainty in the Mazama isopachs and the implications for interpreting distal tephra deposits from large
Mount_Mazama
Gas reservoirs in the North Sea
Offshore Installations". odims.ospar.org. Retrieved 11 December 2021. "OGA interactive Maps". ogauthority.maps.arcgis.com. Retrieved 11 December 2021.
Davy, Bessemer, Beaufort, Brown and Boyle gas fields
Davy,_Bessemer,_Beaufort,_Brown_and_Boyle_gas_fields
Volcano crater in Hawaiʻi
(PDF) on 30 December 2008. Retrieved November 12, 2025. Summit Area Map (PDF) (Map). Hawaiʻi Volcanoes National Park. p. 1. Archived from the original
Kīlauea_Iki
American geologist (1937–2014)
Appalachian Basin: maps for assessing hydrocarbon potential and thermal maturity (conodont color-alteration isograds and overburden isopachs)" (1978, with
Anita_G._Harris
Mountain in Curicó Province, Chile
Bibcode:1992BVol...54...93H. doi:10.1007/BF00278002. S2CID 128972435. Isopach mapping of the volcanic deposits, between 5 and 1 centimeter (2.0 and 0
Cerro_Azul_(Chile_volcano)
Volcanic crater in Oregon, United States
McKenzie and Santiam Passes region between 4,500 and 1,100 years ago. Isopach mapping of the deposits from Blue Lake Crater suggest an eruptive volume
Blue_Lake_Crater
Large early layered igneous intrusion
Bushveld Complex. The southern part of the Pilanesberg Complex exhibits NW–SE isopach lines that trend parallel to the Rustenburg Fault, which dips in the same
Bushveld_Igneous_Complex
Theory in Earth sciences
assumption that the layers are close to parallel. Convergence map shows lines of equal distance (isopach lines) between key layer and target layer. If the layers
Perspective geological correlation
Perspective_geological_correlation
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