Diagenesis and Thermal Maturity of the Cogollo Group rocks in the ANH-CR-Montecarlo-1X well, Cesar-Ranchería Basin, Colombia

IF 0.9 4区 地球科学 Q3 GEOLOGY
Carlos A Ríos, M. Vargas, Mario Garcia
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引用次数: 0

Abstract

In ANH-CR-Montecarlo-1X well located in the southern sector of the Cesar-Ranchería basin, Colombia, rocks of the middle Cretaceous outcrop, which have been defined as belonging to the Cogollo Group. The present study concerns with the diagenetic evolution and thermal maturity of this geological unit, integrating petrographic techniques (thin section microscopy and scanning electron microscopy), geochemistry (total organic carbon and pyrolysis rock-eval) and basic petrophysics, to establish the thermal maturity and the potential of rocks as reservoirs of conventional and unconventional hydrocarbons. The results of petrographic and diagenetic analysis revealed that the rocks compositionally correspond to quartz sandstones and graywackes and carbonate rocks to mudstones and wackestones; which were affected by diagenetic processes such as compaction, mineral neoformations distinguishing minerals from the group of clays that cover the grains of the framework, and other types of precipitates of cements such as silica, ferrous and non-ferrous carbonate, some of these present partial and/or total dissolution, for which secondary porosity is recognized, also metasomatisms, where processes of chloritization and illitization of the argillaceous matrix are observed, alteration of feldspars to ferrous and non-ferrous carbonate, which affects the porosity and permeability of the rock; and recrystallization from micrite to sparite and carbonate precipitation in calcareous rocks. The study also showed that the rocks were more affected by compaction than precipitation of the different cements. The research contributes to the understanding of the impact of diagenetic processes on porosity, as well as their spatial and temporal distribution, providing diagenetic paragenesis for both siliciclastic and carbonatic rocks. When we classifying siliciclastic rocks as potential reservoir rocks, low potential results were obtained as conventional reservoirs but has good potential as non-conventional reservoirs (tight sandstones), this respect to porosity and permeability data. The geochemical studies in the calcareous rocks exhibited low to good content of total organic carbon, overmaturity state and a low generation potential with type III and IV kerogens.
哥伦比亚Cesar Ranchería盆地ANH-CR-Montecarlo-1X井中Cogollo群岩石的成岩作用和热成熟度
位于哥伦比亚Cesar-Ranchería盆地南段的ANH-CR-Montecarlo-1X井,中白垩统露头岩石被确定为Cogollo群。本研究结合岩石学技术(薄片显微镜和扫描电镜)、地球化学技术(总有机碳和热解岩石评价)和基础岩石物理学,对该地质单元的成岩演化和热成熟度进行了研究,以确定岩石的热成熟度和作为常规和非常规油气储集层的潜力。岩石学分析和成岩作用分析结果表明,岩石组成为石英砂岩和灰岩,碳酸盐岩为泥岩和灰岩;它们受到成岩过程的影响,如压实作用,矿物新形成,区别于覆盖框架颗粒的粘土组中的矿物,以及其他类型的胶结物沉淀,如二氧化硅,亚铁和非亚铁碳酸盐,其中一些存在部分和/或全部溶解,其中次生孔隙被识别,还有交代作用,在那里可以观察到泥质基质的绿泥化和非石化过程。长石蚀变为含铁和非铁碳酸盐,影响岩石的孔隙度和渗透率;钙质岩石中泥晶到闪晶的再结晶和碳酸盐的沉淀。研究还表明,压实作用对岩石的影响大于不同胶结物的沉淀作用。该研究有助于认识成岩作用对孔隙度的影响及其时空分布,为硅屑岩和碳酸盐岩的成岩共生作用提供理论依据。当我们将硅屑岩分类为潜在储层时,常规储层的潜力较低,而非常规储层(致密砂岩)的潜力较好,这方面的孔隙度和渗透率数据。钙质岩地球化学研究显示,总有机碳含量低至好,过成熟状态,生烃潜力低,干酪根类型为ⅲ型和ⅳ型。
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来源期刊
Andean Geology
Andean Geology 地学-地质学
CiteScore
3.90
自引率
0.00%
发文量
17
审稿时长
>12 weeks
期刊介绍: This journal publishes original and review articles on geology and related sciences, in Spanish or English, in three issues a year (January, May and September). Articles or notes on major topics of broad interest in Earth Sciences dealing with the geology of South and Central America and Antarctica, and particularly of the Andes, are welcomed. The journal is interested in publishing thematic sets of papers and accepts articles dealing with systematic Paleontology only if their main focus is the chronostratigraphical, paleoecological and/or paleogeographical importance of the taxa described therein.
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