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===Isopach===
 
===Isopach===
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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 trajectory|wellbore deviation]] and formation [[dip]] are needed to make isopach maps.
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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 trajectory|wellbore deviation]] and formation [[dip]] are needed to make isopach maps.
    
===Isochore===
 
===Isochore===
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===Isochron===
 
===Isochron===
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An ''[[Mapping with two-dimensional seismic data#Time interval maps|isochron map]]'' is a contour map of equal values of seismic traveltime between selected events.<ref name=pt06r141 /> Isochron maps are the seismic analog of isochore maps and, as such, are intended to derive thickness information from seismic data. Isochroning between events above and below a pay horizon, for example, would estimate pay thickness. Renick and Gunn<ref name=pt06r109>Renick, H. Jr., Gunn, R. D., 1989, Triangle Ranch Headquarters field development using shallow core holes and high-resolution seismic data: Geophysics, v. 54, n. 11, p. 1384–1396, DOI: [http://library.seg.org/doi/abs/10.1190/1.1442602 10.1190/1.1442602].</ref> present a good case history of using isochron and time-structure maps to generate “isopach” and elevation-structure maps. Their isochron-isopach approach delineated reef trends for further development drilling and used well penetrations through a shallow horizon for depth control on a deeper horizon. Phipps<ref name=pt06r99>Phipps, G. G., 1989, Exploring for dolomitized Slave Point carbonates in northeastern British Columbia: Geophysics, v. 54, n. 7, p. 806–814, DOI: [http://library.seg.org/doi/abs/10.1190/1.1442709 10.1190/1.1442709].</ref> documents the pros and cons of using isochron thins and structural highs as exploration drilling criteria for dolomitized Devonian limestones.
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An ''[[Mapping with two-dimensional seismic data#Time interval maps|isochron map]]'' is a contour map of equal values of seismic traveltime between selected events.<ref name=pt06r141 /> [[Isochron]] maps are the seismic analog of isochore maps and, as such, are intended to derive thickness information from seismic data. Isochroning between events above and below a pay horizon, for example, would estimate pay thickness. Renick and Gunn<ref name=pt06r109>Renick, H. Jr., Gunn, R. D., 1989, Triangle Ranch Headquarters field development using shallow core holes and high-resolution seismic data: Geophysics, v. 54, n. 11, p. 1384–1396, DOI: [http://library.seg.org/doi/abs/10.1190/1.1442602 10.1190/1.1442602].</ref> present a good case history of using isochron and time-structure maps to generate “isopach” and elevation-structure maps. Their isochron-isopach approach delineated reef trends for further development drilling and used well penetrations through a shallow horizon for depth control on a deeper horizon. Phipps<ref name=pt06r99>Phipps, G. G., 1989, Exploring for dolomitized Slave Point carbonates in northeastern British Columbia: Geophysics, v. 54, n. 7, p. 806–814, DOI: [http://library.seg.org/doi/abs/10.1190/1.1442709 10.1190/1.1442709].</ref> documents the pros and cons of using isochron thins and structural highs as exploration drilling criteria for dolomitized Devonian limestones.
    
==Mapping to calculate reserves==
 
==Mapping to calculate reserves==
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A variety of other maps can come into play during the development of a specific reservoir. Maps of facies, facies architecture for more information, see [[Lithofacies and environmental analysis of clastic depositional systems]] and [[Carbonate reservoir models: facies, diagenesis, and flow characterization]]), paleoenvironment, and isolithology might be particularly important in selecting [[stepout well location]]s and planning reservoir development strategy. Other reservoir properties such as [[Wikipedia:Temperature|temperature]] can have value for specific reservoir engineering applications, particularly where potentially temperature-sensitive chemical [[stimulation]], production, or recovery technology might be involved.
 
A variety of other maps can come into play during the development of a specific reservoir. Maps of facies, facies architecture for more information, see [[Lithofacies and environmental analysis of clastic depositional systems]] and [[Carbonate reservoir models: facies, diagenesis, and flow characterization]]), paleoenvironment, and isolithology might be particularly important in selecting [[stepout well location]]s and planning reservoir development strategy. Other reservoir properties such as [[Wikipedia:Temperature|temperature]] can have value for specific reservoir engineering applications, particularly where potentially temperature-sensitive chemical [[stimulation]], production, or recovery technology might be involved.
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==Examples of use==
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* Bally, A. W., Gordy, P. L., Stewart, G. A., 1966, Structure, seismic data and orogenic evolution of southern Canadian Rocky Mountains: Bulletin of Canadian Petroleum Geology, vol. 4, p. 337–381.
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* Bally, A. W., Burbi, L., Cooper, C., Ghelardoni, R., 1986, Balanced sections and seismic reflection profiles across the central Apennines: Memorie della Societa Geologica Italiana, vol. 35, p. 257–310.
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* Dixon, J. S., 1982, [http://archives.datapages.com/data/bulletns/1982-83/data/pg/0066/0010/1550/1560.htm Regional structural synthesis, Wyoming salient of the Western over-thrust belt]: AAPG Bulletin, vol. 66, p. 1560–1580.
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* Dunn, J. F., Hartshorn, K. G., Hartshorn, P. W., 1995, [http://archives.datapages.com/data/specpubs/memoir62/27dunn/0523.htm Structural styles and hydrocarbon potential of the Sub-Andean thrust belt of southern Bolivia], in Tankard, A. J., Suarez, R. S., Welsink, H. J., eds., Petroleum Basins of South America: [http://store.aapg.org/detail.aspx?id=476 AAPG Memoir 62], p. 523–543.
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* Dutton, S. P., Goldstein, A. G., Ruppel, S. C., 1982, Petroleum potential of the Palo Duro basin, Texas Panhandle: University of Texas at Austin Bureau of Economic Geology Report of Investigations 123, 87 p.
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* Picha, F. J., 1996, [http://archives.datapages.com/data/bulletns/1994-96/data/pg/0080/0010/1500/1547.htm Exploring for hydrocarbons under thrust belts—a challenging new frontier in the Carpathians and elsewhere]: AAPG Bulletin, vol. 80, p. 1547–1564.
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* Roure, F., Carnevali, J. O., Gou, Y., Subieta, T., 1994, Geometry and kinematics of the north Monagas thrust belt (Venezuela): Marine and Petroleum Geology, vol. 11, p. 347–362., 10., 1016/0264-8172(94)90054-X
    
==See also==
 
==See also==
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[[Category:Geological methods]]
 
[[Category:Geological methods]]
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[[Category:Methods in Exploration 10]]

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