{"id":1044,"date":"2026-02-12T04:50:42","date_gmt":"2026-02-12T04:50:42","guid":{"rendered":"https:\/\/gaeatech.com\/wordpress\/?p=1044"},"modified":"2026-03-17T20:58:17","modified_gmt":"2026-03-17T20:58:17","slug":"common-geophysical-curve-abbreviations","status":"publish","type":"post","link":"https:\/\/gaeatech.com\/knowledge-center\/common-geophysical-curve-abbreviations\/","title":{"rendered":"Mastering the Code: A Guide to Common Geophysical Curve Abbreviations"},"content":{"rendered":"\n<p>Ever stared at a Log ASCII Standard (LAS) file and felt like you were reading an ancient cypher? You aren&#8217;t alone. Geophysical logs are packed with&nbsp;<strong>mnemonics<\/strong>\u2014short-form abbreviations that represent complex borehole measurements. Understanding these is critical for accurate petrophysical analysis and reservoir characterization.<\/p>\n\n\n\n<p>In this guide, we break down the most common geophysical curve abbreviations you&#8217;ll encounter in the field.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-the-big-three-lithology-and-porosity\"><strong>The &#8220;Big Three&#8221;: Lithology and Porosity<\/strong><\/h3>\n\n\n\n<p>Most logging suites begin with these fundamental curves to identify rock types and fluid-holding capacity.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>GR (Gamma Ray):<\/strong>&nbsp;Measures natural radioactivity. High readings typically indicate shales, while low readings suggest &#8220;clean&#8221; sandstones or carbonates.<\/li>\n\n\n\n<li><strong>RHOB (Bulk Density):<\/strong>&nbsp;Represents the density of the formation. Often used alongside&nbsp;<strong>NPHI<\/strong>&nbsp;to determine porosity and lithology.<\/li>\n\n\n\n<li><strong>NPHI (Neutron Porosity):<\/strong>&nbsp;Measures the hydrogen index in the formation, primarily used as a proxy for porosity.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-resistivity-finding-the-hydrocarbons\"><strong>Resistivity: Finding the Hydrocarbons<\/strong><\/h3>\n\n\n\n<p>Resistivity curves help distinguish between water-saturated zones and those containing oil or gas.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>RT (True Resistivity):<\/strong>&nbsp;The deep-reading measurement of the uninvaded zone.<\/li>\n\n\n\n<li><strong>ILD \/ LLD (Induction Deep \/ Laterolog Deep):<\/strong>&nbsp;Specific tool-dependent abbreviations for deep resistivity.<\/li>\n\n\n\n<li><strong>RXO (Flushed Zone Resistivity):<\/strong>&nbsp;Measures the area near the borehole wall where drilling mud has displaced original fluids.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-mechanical-and-auxiliary-curves\"><strong>Mechanical and Auxiliary Curves<\/strong><\/h3>\n\n\n\n<p>These curves provide vital context about the borehole environment.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CALI (Caliper):<\/strong>&nbsp;Measures the diameter of the borehole. Crucial for identifying &#8220;washouts&#8221; or &#8220;filter cakes&#8221;.<\/li>\n\n\n\n<li><strong>SP (Spontaneous Potential):<\/strong>&nbsp;Measures the natural electric potential between the borehole fluid and the formation.<\/li>\n\n\n\n<li><strong>DT (Sonic \/ Delta-T):<\/strong>&nbsp;Represents the interval transit time of sound waves. Used for seismic tie-ins and calculating sonic porosity.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-spectral-gamma-ray-sgr\"><strong>Spectral Gamma Ray (SGR)<\/strong><\/h3>\n\n\n\n<p>While a standard Gamma Ray (GR) log gives the total natural radioactivity, spectral logs decompose this into its three primary sources.&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>THOR (or TH):<\/strong>&nbsp;Thorium concentration in parts per million (ppm). It is often associated with heavy minerals and continental shales.<\/li>\n\n\n\n<li><strong>URAN (or U):<\/strong>&nbsp;Uranium concentration (ppm). High uranium is a common indicator of organic-rich source rocks.<\/li>\n\n\n\n<li><strong>POTA (or K):<\/strong>&nbsp;Potassium concentration in percentage (%). It helps identify specific clay types like illite or potash minerals.<\/li>\n\n\n\n<li><strong>CGR (Computed Gamma Ray):<\/strong>&nbsp;The total gamma ray signal minus the contribution from Uranium (<img decoding=\"async\" src=\"blob:https:\/\/gaeatech.com\/eea0d47c-742a-463a-89b3-b4c0fa24e73b\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><\/semantics><\/math>). This is often a better indicator of clay content than the standard total log.&nbsp;<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-elemental-spectroscopy-geochemical-logs\"><strong>Elemental Spectroscopy (Geochemical) Logs<\/strong><\/h3>\n\n\n\n<p>These tools (e.g., Schlumberger\u2019s LithoScanner) use neutron capture to determine the elemental weight fractions of the rock matrix.&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>CSI (Silicon):<\/strong>&nbsp;Used to identify sandstones and cherts.<\/li>\n\n\n\n<li><strong>CCA (Calcium):<\/strong>&nbsp;Primary indicator for limestones and calcitic cements.<\/li>\n\n\n\n<li><strong>CFE (Iron):<\/strong>&nbsp;Helps identify siderite, pyrite, and iron-rich clays.<\/li>\n\n\n\n<li><strong>CSUL (Sulfur):<\/strong>&nbsp;Key for detecting anhydrite or gypsum.<\/li>\n\n\n\n<li><strong>LIR (Lithology Indicator Ratio):<\/strong>&nbsp;Often a calculated ratio of&nbsp;<img decoding=\"async\" src=\"blob:https:\/\/gaeatech.com\/8887042c-4c2b-4e2f-a72c-7ae8bc38ccdc\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><semantics><\/semantics><\/math>&nbsp;used to differentiate between siliciclastics and carbonates.&nbsp;<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-nuclear-magnetic-resonance-nmr\"><strong>Nuclear Magnetic Resonance (NMR)<\/strong><\/h3>\n\n\n\n<p>NMR tools measure the relaxation time of hydrogen protons, providing a &#8220;spectrum&#8221; of pore sizes.&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>TCMR (Total CMR Porosity):<\/strong>&nbsp;The total fluid-filled porosity from magnetic resonance.<\/li>\n\n\n\n<li><strong>BVI (Bound Volume Irreducible):<\/strong>&nbsp;Fluid held in tiny pores by capillary forces that will not flow.<\/li>\n\n\n\n<li><strong>FFI (Free Fluid Index):<\/strong>&nbsp;The volume of fluid in larger pores that is potentially producible.<\/li>\n\n\n\n<li><strong>&nbsp;Spectrum:<\/strong>&nbsp;The primary output showing the distribution of decay times, which serves as a proxy for pore size distribution.&nbsp;<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-array-induction-amp-advanced-resistivity\"><strong>Array Induction &amp; Advanced Resistivity<\/strong><\/h3>\n\n\n\n<p>Instead of one &#8220;deep&#8221; reading, these provide a spectrum of radial depths into the formation.&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>AT10, AT30, AT90:<\/strong>&nbsp;Resistivity at 10, 30, and 90 inches of radial investigation. Comparing these (the &#8220;invasion profile&#8221;) tells you how much drilling fluid has leaked&nbsp;into the rock.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-advanced-spectral-curve-comparison-table\"><strong>Advanced Spectral Curve Comparison Table<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-left\" data-align=\"left\">Measurement Category<\/th><th class=\"has-text-align-left\" data-align=\"left\">Schlumberger (SLB)<\/th><th class=\"has-text-align-left\" data-align=\"left\">Halliburton (HAL)<\/th><th class=\"has-text-align-left\" data-align=\"left\">Baker Hughes (BKR)<\/th><th class=\"has-text-align-left\" data-align=\"left\">Common \/ Generic<\/th><\/tr><tr><td><strong>Spectral Gamma (Thorium)<\/strong><\/td><td>THOR<\/td><td>TH<\/td><td>THOR<\/td><td><strong>THOR \/ TH<\/strong><\/td><\/tr><tr><td><strong>Spectral Gamma (Potassium)<\/strong><\/td><td>POTA<\/td><td>K<\/td><td>POTA<\/td><td><strong>POTA \/ K<\/strong><\/td><\/tr><tr><td><strong>Spectral Gamma (Uranium)<\/strong><\/td><td>URAN<\/td><td>U<\/td><td>URAN<\/td><td><strong>URAN \/ U<\/strong><\/td><\/tr><tr><td><strong>Lithology \/ Geochemistry<\/strong><\/td><td>LithoScanner \/ ECS<\/td><td>GEM \/ EcoScope<\/td><td>FLEX<\/td><td><strong>Elemental<\/strong><\/td><\/tr><tr><td><strong>Total NMR Porosity<\/strong><\/td><td>TCMR<\/td><td>MPHI<\/td><td>TPOR<\/td><td><strong>TCMR \/ PHIT_NMR<\/strong><\/td><\/tr><tr><td><strong>NMR Free Fluid<\/strong><\/td><td>FFI<\/td><td>MFFI<\/td><td>MPRM<\/td><td><strong>FFI<\/strong><\/td><\/tr><tr><td><strong>Bound Water (NMR)<\/strong><\/td><td>BVI<\/td><td>MBVI<\/td><td>MBVI<\/td><td><strong>BVI<\/strong><\/td><\/tr><tr><td><strong>Array Resistivity (Deep)<\/strong><\/td><td>AT90 \/ RL90<\/td><td>RLA5<\/td><td>AIT90<\/td><td><strong>RESD \/ RT<\/strong><\/td><\/tr><tr><td><strong>Array Resistivity (Shallow)<\/strong><\/td><td>AT10 \/ RL10<\/td><td>RLA1<\/td><td>AIT10<\/td><td><strong>RESS \/ RXO<\/strong><\/td><\/tr><tr><td><strong>Sonic (Compressional)<\/strong><\/td><td>DT \/ DTC<\/td><td>DT<\/td><td>DT<\/td><td><strong>DT \/ DTC<\/strong><\/td><\/tr><tr><td><strong>Sonic (Shear)<\/strong><\/td><td>DTS \/ DTSM<\/td><td>DTS<\/td><td>DTS<\/td><td><strong>DTS<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-key-differences-in-identification\"><strong>Key Differences in Identification<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Acoustic Logs:<\/strong>&nbsp;While&nbsp;<strong>DT<\/strong>&nbsp;is the near-universal standard for compressional slowness, shear wave mnemonics vary more widely, often appearing as&nbsp;<strong>DTS<\/strong>,&nbsp;<strong>DTSM<\/strong>&nbsp;(Dipole Shear), or&nbsp;<strong>DT4P\/DT4S<\/strong>&nbsp;depending on the specific tool array.<\/li>\n\n\n\n<li><strong>Resistivity Arrays:<\/strong>&nbsp;Schlumberger\u2019s&nbsp;<strong>AIT<\/strong>&nbsp;(Array Induction Tool) uses&nbsp;<strong>AT<\/strong>&nbsp;prefixes followed by numerical depths (e.g., AT90), whereas Halliburton often uses&nbsp;<strong>RLA<\/strong>&nbsp;(Resistivity Log Array) for similar measurements.<\/li>\n\n\n\n<li><strong>Geochemical Logs:<\/strong>&nbsp;These are the most proprietary. For example, SLB\u2019s&nbsp;<strong>ECS<\/strong>&nbsp;(Elemental Capture Spectroscopy) and HAL&#8217;s&nbsp;<strong>GEM<\/strong>&nbsp;(Gas Evolution Measurement) both provide weight fractions for Silicon, Calcium, and Iron, but their internal channel names for &#8220;uncertainty&#8221; and &#8220;quality&#8221; factors differ significantly.&nbsp;<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-pro-tip-case-sensitivity-matters\"><strong>Pro Tip: Case Sensitivity Matters<\/strong><\/h3>\n\n\n\n<p>In many petrophysical software packages,&nbsp;<strong>UPPER CASE<\/strong>&nbsp;mnemonics (like&nbsp;<code>DENS<\/code>) represent raw input logs, while&nbsp;<strong>Mixed Case<\/strong>&nbsp;(like&nbsp;<code>PhiE<\/code>) often denotes calculated output results.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-learn-more-about-our-data-solutions\">Learn more about our Data Solutions<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a 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You aren&#8217;t alone. Geophysical logs are packed with&nbsp;mnemonics\u2014short-form abbreviations that represent complex borehole measurements. Understanding these is critical for accurate petrophysical analysis and reservoir characterization. In this guide, we break down the most common geophysical curve abbreviations [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1047,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[975],"tags":[],"class_list":["post-1044","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-geoscience-data-digitization"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Geophysical Curve Abbreviations Explained for You - Knowledge Center<\/title>\n<meta name=\"description\" content=\"Confused by geophysical curve abbreviations? 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