{"id":26229,"date":"2024-04-17T14:09:45","date_gmt":"2024-04-17T12:09:45","guid":{"rendered":"https:\/\/nr.stage.dekodes.no\/en\/?post_type=bc_project&#038;p=26229"},"modified":"2025-10-03T08:28:35","modified_gmt":"2025-10-03T06:28:35","slug":"surface-modelling-and-depth-conversion-cohiba","status":"publish","type":"bc_project","link":"https:\/\/nr.stage.dekodes.no\/en\/projects\/surface-modelling-and-depth-conversion-cohiba\/","title":{"rendered":"Surface modelling and depth conversion (COHIBA)"},"content":{"rendered":"\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<p><strong>COHIBA is a software tool that describes transitions between geological layers. This cutting edge tool is in extensive use in the oil and gas industry.<\/strong><\/p>\n\n\n\t<div class=\"nr-spacer nr-spacer-small wp-block-nr-spacer\">\n\t<\/div>\n\t\n\n\n<div class=\"wp-block-group has-background\" style=\"background-color:#cdf1f1\">\n<p><strong>COHIBA version 7.2<\/strong>&nbsp;was release 4 March 2025. Important improvements are: <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A new algorithm for identifying of multilateral wells<\/li>\n\n\n\n<li>New mathematics library for improved robustness<\/li>\n\n\n\n<li>Faster surface simulation<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-group has-primary-200-background-color has-background\">\n<h2 class=\"wp-block-heading\">COHIBA training course<\/h2>\n\n\n\n<p>Are you interested in learning COHIBA for your own projects?<\/p>\n\n\n\n<p><br>At NR, we offer practical training covering both basic and advanced functionality of the tool, with a strong focus on real-world data.<\/p>\n\n\n\t\t<div id=\"post-type-multi-block_3760d1b8669cd06d5d5ead9e2f44b2bb\" class=\"wp-block-post-type-multi type-manual style-card t2-grid\">\n\t\t\t\t\t\t\t<div class=\"t2-grid-item-col-12\">\n\t\t\t\t\t\t<a href=\"https:\/\/nr.stage.dekodes.no\/en\/events\/surface-modelling-with-cohiba\/\" class=\"card-list card-list-default\">\n\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 24 24\" height=\"24\" width=\"24\" class=\"t2-icon t2-icon-arrowforward\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M15.9 4.259a1.438 1.438 0 0 1-.147.037c-.139.031-.339.201-.421.359-.084.161-.084.529-.001.685.035.066 1.361 1.416 2.947 3l2.882 2.88-10.19.02c-8.543.017-10.206.029-10.29.075-.282.155-.413.372-.413.685 0 .313.131.53.413.685.084.046 1.747.058 10.29.075l10.19.02-2.882 2.88c-1.586 1.584-2.912 2.934-2.947 3-.077.145-.085.521-.013.66a.849.849 0 0 0 .342.35c.156.082.526.081.68-.001.066-.035 1.735-1.681 3.709-3.656 2.526-2.53 3.606-3.637 3.65-3.742A.892.892 0 0 0 23.76 12a.892.892 0 0 0-.061-.271c-.044-.105-1.124-1.212-3.65-3.742-1.974-1.975-3.634-3.616-3.689-3.645-.105-.055-.392-.107-.46-.083\"\/><\/svg>\n\t\t\t\tLearn surface modelling with COHIBA\n\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\n\n\t<div class=\"nr-spacer nr-spacer-small wp-block-nr-spacer\">\n\t<\/div>\n\t\n\n\n<h2 class=\"wp-block-heading\">Why use&nbsp;COHIBA?<\/h2>\n\n\n\n<p>COHIBA&nbsp;is a fast and accurate tool for making deterministic and stochastic surfaces.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Conditions to vertical and horizontal wells using various well data: well picks, zone logs, distance data (DDR\/RNS), and surface dips<\/li>\n\n\n\n<li>Handles many surfaces and explicitly takes into account their internal dependencies.<\/li>\n\n\n\n<li>Handles<strong>&nbsp;<\/strong>well path TVD uncertainty<strong>&nbsp;<\/strong>in multilateral horizontal wells.<\/li>\n\n\n\n<li>Analyses input data, filter away erroneous data, and reports problems.<\/li>\n\n\n\n<li>Thorough analysis of model and data. Extensive reporting.<\/li>\n\n\n\n<li>Handles large amount of data.<\/li>\n\n\n\n<li>Stochastic depth-conversion.<\/li>\n\n\n\n<li>Cross validation of wells.<\/li>\n<\/ul>\n\n\n\n<p>COHIBA&nbsp;uses the available data in a consistent manner to minimize the uncertainty. The accuracy is further improved by linking together all surfaces in a multi-layered model.<\/p>\n\n\n\n<p>COHIBA&nbsp;provides two ways of evaluating&nbsp;uncertainty:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A local depth uncertainty at every surface location can be calculated<\/li>\n\n\n\n<li>Simulated (Monte Carlo) surface realizations can be generated. A set of these spans the uncertainty range<\/li>\n<\/ul>\n\n\n\t<div class=\"nr-spacer nr-spacer-small wp-block-nr-spacer\">\n\t<\/div>\n\t\n\n\n<h2 class=\"wp-block-heading\">Geosteering<\/h2>\n\n\n\n<p>The animation below shows vertical cross sections along a well trajectory, simulating how COHIBA-models can be updated during a drilling process. Notice how the uncertainty band (shaded grey area) of the top surface shrinks as more and more of the well is drilled.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"371\" height=\"215\" src=\"https:\/\/nr.stage.dekodes.no\/content\/uploads\/sites\/2\/2021\/02\/video_0.167sec.gif\" alt=\"Animation simulating how COHIBA-models can be updated during a drilling process.\" class=\"wp-image-13475\" style=\"aspect-ratio:1.7255813953488373;width:577px;height:auto\" \/><figcaption class=\"wp-element-caption\"><em>Animation simulating how COHIBA-models can be updated during a drilling process.<\/em> Figure: NR.<\/figcaption><\/figure>\n\n\n\t<div class=\"nr-spacer nr-spacer-small wp-block-nr-spacer\">\n\t<\/div>\n\t\n\n\n<h2 class=\"wp-block-heading\">Zone logs give improved surfaces<\/h2>\n\n\n\n<p>Below are two cross sections through a real reservoir. In the first figure, well picks have been used for conditioning. In the second figure the whole zone log has been used, and this makes the zonation correct.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"740\" height=\"527\" src=\"https:\/\/nr.stage.dekodes.no\/content\/uploads\/sites\/2\/2021\/11\/image-2.png\" alt=\"\" class=\"wp-image-13239\" srcset=\"https:\/\/nr.stage.dekodes.no\/content\/uploads\/sites\/2\/2021\/11\/image-2.png 740w, https:\/\/nr.stage.dekodes.no\/content\/uploads\/sites\/2\/2021\/11\/image-2-300x214.png 300w\" sizes=\"auto, (max-width: 740px) 100vw, 740px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<h3 class=\"wp-block-heading\">To learn more about COHIBA, please contact:<\/h3>\n\n\n\n\n\t\t<div id=\"post-type-multi-block_95a4803d0980971f2d4677ae34707138\" class=\"wp-block-post-type-multi type-manual style-card-bc_employee t2-grid\">\n\t\t\t\t\t\t\t<div class=\"t2-grid-item-col-12\">\n\t\t\t\t\t\t<a href=\"https:\/\/nr.stage.dekodes.no\/en\/employees\/pal-dahle\/\" class='card-employee'>\n\t\t\t\t\t<figure>\n\t\t\t\t<img decoding=\"async\" src=\"https:\/\/nr.stage.dekodes.no\/content\/uploads\/sites\/2\/2024\/12\/pal-dahle.jpg\" alt=\"\">\n\t\t\t<\/figure>\n\t\t\t\t<div class=\"card-employee__content\">\n\t\t\t<p class=\"card-employee__name\">P\u00e5l Dahle<\/p>\n\t\t\t\t\t\t\t<p class=\"card-employee__position\">Senior Research Scientist<\/p>\n\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 24 24\" height=\"24\" width=\"24\" class=\"t2-icon t2-icon-arrowforward\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M15.9 4.259a1.438 1.438 0 0 1-.147.037c-.139.031-.339.201-.421.359-.084.161-.084.529-.001.685.035.066 1.361 1.416 2.947 3l2.882 2.88-10.19.02c-8.543.017-10.206.029-10.29.075-.282.155-.413.372-.413.685 0 .313.131.53.413.685.084.046 1.747.058 10.29.075l10.19.02-2.882 2.88c-1.586 1.584-2.912 2.934-2.947 3-.077.145-.085.521-.013.66a.849.849 0 0 0 .342.35c.156.082.526.081.68-.001.066-.035 1.735-1.681 3.709-3.656 2.526-2.53 3.606-3.637 3.65-3.742A.892.892 0 0 0 23.76 12a.892.892 0 0 0-.061-.271c-.044-.105-1.124-1.212-3.65-3.742-1.974-1.975-3.634-3.616-3.689-3.645-.105-.055-.392-.107-.46-.083\"\/><\/svg>\n\t\t<\/div>\n\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"t2-grid-item-col-12\">\n\t\t\t\t\t\t<a href=\"https:\/\/nr.stage.dekodes.no\/en\/employees\/ariel-almendral-vazquez\/\" class='card-employee'>\n\t\t\t\t\t<figure>\n\t\t\t\t<img decoding=\"async\" src=\"https:\/\/nr.stage.dekodes.no\/content\/uploads\/sites\/2\/2024\/05\/ariel-almendral-vazquez-17.jpg\" alt=\"\">\n\t\t\t<\/figure>\n\t\t\t\t<div class=\"card-employee__content\">\n\t\t\t<p class=\"card-employee__name\">Ariel Almendral Vazquez<\/p>\n\t\t\t\t\t\t\t<p class=\"card-employee__position\">Senior Research Scientist<\/p>\n\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 24 24\" height=\"24\" width=\"24\" class=\"t2-icon t2-icon-arrowforward\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M15.9 4.259a1.438 1.438 0 0 1-.147.037c-.139.031-.339.201-.421.359-.084.161-.084.529-.001.685.035.066 1.361 1.416 2.947 3l2.882 2.88-10.19.02c-8.543.017-10.206.029-10.29.075-.282.155-.413.372-.413.685 0 .313.131.53.413.685.084.046 1.747.058 10.29.075l10.19.02-2.882 2.88c-1.586 1.584-2.912 2.934-2.947 3-.077.145-.085.521-.013.66a.849.849 0 0 0 .342.35c.156.082.526.081.68-.001.066-.035 1.735-1.681 3.709-3.656 2.526-2.53 3.606-3.637 3.65-3.742A.892.892 0 0 0 23.76 12a.892.892 0 0 0-.061-.271c-.044-.105-1.124-1.212-3.65-3.742-1.974-1.975-3.634-3.616-3.689-3.645-.105-.055-.392-.107-.46-.083\"\/><\/svg>\n\t\t<\/div>\n\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\n\n\n<div class=\"wp-block-group has-primary-200-background-color has-background\">\n<p>Project: COHIBA<\/p>\n\n\n\n<p>Partners: Equinor, Aker BP, Wintershall Dea, V\u00e5r Energi og Total<\/p>\n\n\n\n<p>Period: 2005 &#8211;<\/p>\n<\/div>\n\n\n\t<div class=\"nr-spacer nr-spacer-small wp-block-nr-spacer\">\n\t<\/div>\n\t\n\n\n<div class=\"wp-block-group\">\n<div class=\"wp-block-group has-background\" style=\"background-color:#cdf1f1\">\n<h4 class=\"wp-block-heading\"><strong>Software<\/strong><\/h4>\n\n\n\n<p>Request free trial license&nbsp;<a href=\"mailto:sek@nr.stage.dekodes.no\">sek@nr.stage.dekodes.no<\/a><\/p>\n\n\n\t<div class=\"nr-spacer nr-spacer-small wp-block-nr-spacer\">\n\t<\/div>\n\t\n\n\n<p><strong>Manuals<\/strong><\/p>\n\n\n\n<p><a href=\"https:\/\/nr.stage.dekodes.no\/content\/uploads\/2025\/09\/cohiba_manual_7_2_1_mindre.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">COHIBA 7.2.1<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/nr.stage.dekodes.no\/content\/uploads\/2023\/12\/cohiba_manual_7_1-1.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">COHIBA 7.1<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/nr.stage.dekodes.no\/content\/uploads\/2022\/01\/cohiba_manual_7_0.pdf\">COHIBA 7.0<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/nr.stage.dekodes.no\/content\/uploads\/2022\/01\/cohiba_manual_6_1.pdf\">COHIBA 6.1<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/nr.stage.dekodes.no\/content\/uploads\/2022\/01\/cohiba_manual_6_0.pdf\">COHIBA 6.0<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/nr.stage.dekodes.no\/content\/uploads\/2022\/01\/cohiba_manual_5_6.pdf\">COHIBA 5.6<\/a><\/p>\n<\/div>\n<\/div>\n\n\n\t<div class=\"nr-spacer nr-spacer-small wp-block-nr-spacer\">\n\t<\/div>\n\t\n\n\n<div class=\"wp-block-group\">\n<h4 class=\"wp-block-heading\"><strong>Further reading<\/strong><\/h4>\n\n\n\n<p>Almendral Vazquez, A., Dahle, P., Abrahamsen, P., Sektnan, A. \u201c<em>Conditioning geological surfaces to horizontal wells<\/em>\u201d, Computational Geosciences,&nbsp;<strong>26<\/strong>, pages 1223\u20131236 (2022), Springer, DOI:&nbsp;<a href=\"http:\/\/doi.org\/10.1007\/s10596-022-10154-6\">doi.org\/10.1007\/s10596-022-10154-6<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Zone logs reduce uncertainty<\/h2>\n\n\n\n<p>The figures below show how the depth uncertainty is reduced when surfaces are conditioned to zone logs.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"762\" height=\"514\" src=\"https:\/\/nr.stage.dekodes.no\/content\/uploads\/sites\/2\/2021\/11\/image-3.png\" alt=\"How the depth uncertainty is reduced when surfaces are conditioned to zone logs\" class=\"wp-image-13240\" srcset=\"https:\/\/nr.stage.dekodes.no\/content\/uploads\/sites\/2\/2021\/11\/image-3.png 762w, https:\/\/nr.stage.dekodes.no\/content\/uploads\/sites\/2\/2021\/11\/image-3-300x202.png 300w\" sizes=\"auto, (max-width: 762px) 100vw, 762px\" \/><figcaption class=\"wp-element-caption\"><em>How the depth uncertainty is reduced when surfaces are conditioned to zone logs. <\/em>Figures: NR.<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Method<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Layer cake<\/h4>\n\n\n\n<p>The subsurface is constructed as a layer cake model where two surface can be connected several ways. For the generated depth surfaces these ways are balanced such that the uncertainty is minimized.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Statistical model<\/h4>\n\n\n\n<p>Surfaces are treated as multi-normal distributions that are updated using Bayesian statistics. Both predictions and stochastic realizations can be generated.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Data<\/h4>\n\n\n\n<p>Time interpretations, velocity models and isochores are integrated with well data like well picks, zone logs, dips and resistivities to generate optimal depth surfaces. The true-vertical-depth uncertainty in the well path can be integrated.<\/p>\n","protected":false},"featured_media":10860,"template":"","meta":{"_acf_changed":false,"_trash_the_other_posts":false,"editor_notices":[],"footnotes":""},"class_list":["post-26229","bc_project","type-bc_project","status-publish","has-post-thumbnail"],"acf":[],"_links":{"self":[{"href":"https:\/\/nr.stage.dekodes.no\/en\/wp-json\/wp\/v2\/bc_project\/26229","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nr.stage.dekodes.no\/en\/wp-json\/wp\/v2\/bc_project"}],"about":[{"href":"https:\/\/nr.stage.dekodes.no\/en\/wp-json\/wp\/v2\/types\/bc_project"}],"version-history":[{"count":5,"href":"https:\/\/nr.stage.dekodes.no\/en\/wp-json\/wp\/v2\/bc_project\/26229\/revisions"}],"predecessor-version":[{"id":36284,"href":"https:\/\/nr.stage.dekodes.no\/en\/wp-json\/wp\/v2\/bc_project\/26229\/revisions\/36284"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nr.stage.dekodes.no\/en\/wp-json\/wp\/v2\/media\/10860"}],"wp:attachment":[{"href":"https:\/\/nr.stage.dekodes.no\/en\/wp-json\/wp\/v2\/media?parent=26229"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}