<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0120-0283</journal-id>
<journal-title><![CDATA[Boletín de Geología]]></journal-title>
<abbrev-journal-title><![CDATA[Bol. geol.]]></abbrev-journal-title>
<issn>0120-0283</issn>
<publisher>
<publisher-name><![CDATA[Universidad Industrial de Santander]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-02832022000200095</article-id>
<article-id pub-id-type="doi">10.18273/revbol.v44n2-2022004</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Organic geochemistry, lithofacies and gas shale reservoir potential of cretaceous outcrops from Alto de los Caballeros section, Eastern Cordillera Basin - Colombia]]></article-title>
<article-title xml:lang="es"><![CDATA[Geoquímica orgánica, litofacies y potencial como reservorio gas shale de muestras cretácicas de la sección Alto de los Caballeros, cuenca Cordillera Oriental - Colombia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Gómez]]></surname>
<given-names><![CDATA[Mailen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galvis-Macareo]]></surname>
<given-names><![CDATA[Héctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-González]]></surname>
<given-names><![CDATA[Mario]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Arias]]></surname>
<given-names><![CDATA[Juan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Industrial de Santander  ]]></institution>
<addr-line><![CDATA[Bucaramanga ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Sao Paulo  ]]></institution>
<addr-line><![CDATA[Sao Paulo ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<volume>44</volume>
<numero>2</numero>
<fpage>95</fpage>
<lpage>108</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-02832022000200095&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-02832022000200095&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-02832022000200095&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Significant layers of shale are exposed in the Eastern Cordillera of Colombia. These Upper Cretaceous rocks from La Frontera and Conejo Formations in the Chécua-Lenguazaque Syncline, between Ubaté, Carmen de Carupa and Sutatausa towns, were evaluated using geochemical and petrographic analysis to determine their potential as gas shale reservoirs. This structure presents promising characteristics for developing a gas shale reservoir due to its areal extension, the existence of a thick layer of marine cretaceous sequence, and a near location to industrial areas, such as the colombian andean region. In La Frontera and Conejo Formations, the result of outcrop samples analysis indicates that some levels meet the geochemical characteristics required for the existence of potential gas shale reservoirs. One of these levels correspond to the base of La Frontera Formation, where limestones exhibit appropriated organic matter content and maturity conditions for gas shale. In addition, this limestone also presents micro-porosity associated with diagenetic processes and kerogen. The geochemical and petrographic features are similar to those found in the Barnett gas shale. The geochemical and petrographic characteristics reflected by the limestones of La Frontera Formation agree with the criteria described and evaluated internationally for unconventional gas shale reservoirs, similar to those found in the Barnett gas shale, and shows the best conditions for the development of these deposits. Nevertheless, it is necessary to evaluate other petrophysical properties, gas saturation, and effective gas permeability in reservoir condition in order to make a conclusive determination about gas shale potential.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En la Cordillera Oriental de Colombia se encuentran expuestas extensas capas de shale; estas rocas de edad cretácico superior de las formaciones La Frontera y Conejo, en el sector Alto de los Caballeros, entre los municipios de Ubaté, Carmen de Carupa y Sutatausa, fueron evaluadas mediante análisis geoquímicos y petrográficos para determinar su potencial como reservorio de gas shale en el sinclinal Chécua-Lenguazaque. Esta estructura presenta características propicias para el desarrollo de un reservorio de gas shale debido a su extensa área, a la existencia de una gruesa secuencia cretácica de origen marino rica en materia orgánica y a su ubicación cercana a áreas industriales como la región andina colombiana. Los resultados de los análisis de muestras de afloramiento de las formaciones La Frontera y Conejo indican que algunos niveles cumplen con las características geoquímicas requeridas para los reservorios de gas shale. El intervalo de calizas en la base de la Formación La Frontera exhibe un contenido de materia orgánica y condiciones de madurez apropiados para el gas shale, además, esta caliza también presenta microporosidad asociada a procesos diagenéticos y a kerógeno. Las características geoquímicas y petrográficas reflejadas por las calizas de la Formación La Frontera se ajustan a los criterios descritos y evaluados internacionalmente para yacimientos no convencionales de gas shale, son similares a las encontradas en el reservorio Barnett gas shale, y evidencian las mejores condiciones para el desarrollo de este tipo de depósitos. Sin embargo, es necesario evaluar otras propiedades petrofísicas, saturación de gas y permeabilidad efectiva de los gases en condición de reservorio, para así contar con una caracterización completa sobre el potencial de gas shale.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[La Frontera Formation]]></kwd>
<kwd lng="en"><![CDATA[Conejo Formation]]></kwd>
<kwd lng="en"><![CDATA[Unconventional reservoirs]]></kwd>
<kwd lng="es"><![CDATA[Formación La Frontera]]></kwd>
<kwd lng="es"><![CDATA[Formación Conejo]]></kwd>
<kwd lng="es"><![CDATA[Yacimientos no convencionales]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Askenazi]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Biscayart]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Cáneva]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Montenegro]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Moreno]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<source><![CDATA[Analogía entre la Formación Vaca Muerta y shale gas/oil plays de EE. UU]]></source>
<year>2013</year>
<publisher-name><![CDATA[Society of Petroleum Engineers (SPE)]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Barrero]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Pardo]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Vargas]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<source><![CDATA[Colombia Sedimentary Basins: Nomenclature, Boundaries and Petroleum Geology, a new proposal]]></source>
<year>2007</year>
<publisher-name><![CDATA[Agencia Nacional de Hidrocarburos]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Behar]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Beaumont]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Penteado]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Rock-Eval 6 technology: performances and developments]]></article-title>
<source><![CDATA[Oil &amp; Gas Science and Technology]]></source>
<year>2001</year>
<volume>56</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>111-34</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Carvajal-Ortiz]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Gentzis]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Critical considerations when assessing hydrocarbon plays using Rock-Eval pyrolysis and organic petrology data: Data quality revisited]]></article-title>
<source><![CDATA[International Journal of Coal Geology]]></source>
<year>2015</year>
<volume>152</volume>
<page-range>113-22</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Curtis]]></surname>
<given-names><![CDATA[J.B]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Fractured shale-gas systems]]></article-title>
<source><![CDATA[AAPG Bulletin]]></source>
<year>2002</year>
<volume>86</volume>
<numero>11</numero>
<issue>11</issue>
<page-range>1921-38</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Folk]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</person-group>
<source><![CDATA[Petrology of Sedimentary rocks]]></source>
<year>1974</year>
<publisher-name><![CDATA[Hemphill Publishing Co]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<source><![CDATA[Shale Gas Potential in the Eastern Cordillera of Colombia]]></source>
<year>2010</year>
<conf-name><![CDATA[ AAPG International Conference and Exhibition]]></conf-name>
<conf-loc>Calgary, Canada </conf-loc>
</nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Guiza]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Vargas]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<source><![CDATA[Non-conventional hydrocarbon generation from Cretaceous Shale in the Cordillera Oriental, XRF and XRD application]]></source>
<year>2016</year>
</nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hill]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Jarvie]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Zumberge]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Henry]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Pollastro]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Oil and gas geochemistry and petroleum systems of the Fort Worth Basin]]></article-title>
<source><![CDATA[AAPG Bulletin]]></source>
<year>2007</year>
<volume>91</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>445-73</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jarvie]]></surname>
<given-names><![CDATA[D.M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Total organic carbon (TOC) analysis: Geochemical Methods and Exploration]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Merril]]></surname>
<given-names><![CDATA[R.K.]]></given-names>
</name>
</person-group>
<source><![CDATA[Source and Migration Processes and Evaluation Techniques]]></source>
<year>1991</year>
<page-range>113-8</page-range><publisher-name><![CDATA[AAPG Special Volumes]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jiang]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Chen]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Lavoie]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Percival]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Kabanov]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Mineral carbon MinC(%) from Rock-Eval analysis as a reliable and cost-effective measurement of carbonate contents in shale source and reservoir rocks]]></article-title>
<source><![CDATA[Marine and Petroleum Geology]]></source>
<year>2017</year>
<numero>83</numero>
<issue>83</issue>
<page-range>184-94</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Miall]]></surname>
<given-names><![CDATA[A.D]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Facies analysis]]></article-title>
<source><![CDATA[Principles of Sedimentary Basin Analysis]]></source>
<year>1990</year>
<page-range>141-248</page-range><publisher-name><![CDATA[Springer]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Montoya]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Reyes]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<source><![CDATA[Geología de la Plancha 209 Zipaquirá. Informe 2739. Capítulo 4]]></source>
<year>2003</year>
<publisher-name><![CDATA[INGEOMINAS]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Moreno]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<source><![CDATA[Potencial gasífero de las Lutitas del Cretáceo Superior en los sectores Meridional y Norte de la Cordillera Oriental]]></source>
<year>2010</year>
<publisher-loc><![CDATA[Colombia ]]></publisher-loc>
<publisher-name><![CDATA[Universidad Industrial de Santander]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Peters]]></surname>
<given-names><![CDATA[K.E]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Guidelines for evaluating petroleum source rock using programmed pyrolysis]]></article-title>
<source><![CDATA[AAPG Bulletin]]></source>
<year>1986</year>
<volume>70</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>318-29</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Peters]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Cassa]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Applied source rock geochemistry]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Magoon]]></surname>
<given-names><![CDATA[L.B.]]></given-names>
</name>
<name>
<surname><![CDATA[Dow]]></surname>
<given-names><![CDATA[W.G.]]></given-names>
</name>
</person-group>
<source><![CDATA[The Petroleum System - From Source to Trap]]></source>
<year>1994</year>
<page-range>93-120</page-range><publisher-name><![CDATA[AAPG Memoir 60]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Peters]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Xia]]></surname>
<given-names><![CDATA[X.]]></given-names>
</name>
<name>
<surname><![CDATA[Pomerantz]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Mullins]]></surname>
<given-names><![CDATA[O]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Geochemistry applied to evaluation of unconventional resources]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Ma]]></surname>
<given-names><![CDATA[Y.Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Holditch]]></surname>
<given-names><![CDATA[S.A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Unconventional oil and gas resources handbook]]></source>
<year>2016</year>
<page-range>71-126</page-range><publisher-name><![CDATA[Gulf Professional Publishing]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rezaee]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Rothwell]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Gas shale: global significance, distribution, and challenges]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Rezaee]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</person-group>
<source><![CDATA[Fundamentals of Gas Shale Reservoirs]]></source>
<year>2015</year>
<page-range>1-15</page-range><publisher-name><![CDATA[John Wiley and Sons Inc]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Tarazona]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
</person-group>
<source><![CDATA[Análisis de sistemas petrolíferos en la Faja Plegada de la Zona Axial de la Cordillera Oriental Colombiana]]></source>
<year>2017</year>
<publisher-loc><![CDATA[Colombia ]]></publisher-loc>
<publisher-name><![CDATA[Universidad Industrial de Santander]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Uribe]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
</person-group>
<source><![CDATA[Evaluación del potencial de generación de hidrocarburos de la Formación Chipaque mediante análisis petrográficos y geoquímicos en la sección estratigráfica expuesta en la vía que del Municipio de Ubaté conduce al Alto de los Caballeros, Departamento de Cundinamarca - Colombia]]></source>
<year>2019</year>
<publisher-loc><![CDATA[Bucaramanga, Colombia ]]></publisher-loc>
<publisher-name><![CDATA[Universidad Industrial de Santander]]></publisher-name>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
