渝东南地区五峰–龙马溪组的烃源岩特征——以渝参7井为例
Characteristics of Hydrocarbon Source Rocks in the Wufeng-Longmaxi Formations of Southeastern Chongqing—A Case Study from Well Yucan-7
DOI: 10.12677/jogt.2025.474088, PDF,   
作者: 程礼军, 勾 杰*, 刘成均：重庆市地质矿产勘查开发局107地质队，重庆；徐向阳*, 韩克宁, 蒋晨, 刘娜娜：中国石油化工股份有限公司华东油气分公司，江苏 南京；蒙 春：重庆华地资环科技有限公司，重庆
关键词: 五峰组–龙马溪组；烃源岩特征；地球化学评价；渝东南地区；Wufeng-Longmaxi Formations； Hydrocarbon Source Rock Characteristics； Geochemical Evaluation； Southeastern Chongqing
摘要: 本次研究以渝东南地区渝参7井为重点解剖对象，通过系统的地球化学分析手段，深入评价了上奥陶统五峰组–下志留统龙马溪组烃源岩的生烃潜力。分析结果表明：该套烃源岩有机质丰度纵向非均质性强，五峰组TOC含量(平均2.17%)显著高于龙马溪组(平均1.25%)，具备较好的原始生烃潜力；干酪根碳同位素与显微组分特征共同揭示其有机质类型为以I型为主的腐泥型，生烃母质优良；镜质体反射率(Ro平均2.14%)指示烃源岩已处于过成熟演化阶段，生气高峰期已过。综合认为，渝参7井揭示的五峰组烃源岩品质相对较好，研究成果对深化该区页岩气成藏机理认识及勘探选区具有重要指导意义。
Abstract: This work conducted a systematic geochemical analysis of the source rocks from the Upper Ordovician Wufeng Formation to the Lower Silurian Longmaxi Formation, using Well Yucan-7 in southeastern Chongqing as a key research object to thoroughly evaluate their hydrocarbon generation potential. The results indicate that the hydrocarbon source rock exhibits strong vertical heterogeneity in organic matter abundance, with the Wufeng Formation showing a significantly higher mean Total Organic Carbon (TOC) content of 2.17% compared to 1.25% in the Longmaxi Formation, indicating a favorable original hydrocarbon generation potential. Kerogen carbon isotope characteristics and maceral composition collectively reveal that the organic matter is predominantly Type I sapropelic, signifying excellent source material. Vitrinite reflectance (Ro) values, averaging 2.14%, indicate that the source rocks have reached an over-mature stage, having passed the peak phase for gas generation. In conclusion, the Wufeng Formation source rock encountered in Well Yucan-7 demonstrates relatively good quality, and these findings provide significant insights for understanding shale gas accumulation mechanisms and guiding exploration in the region.
文章引用：程礼军, 徐向阳, 勾杰, 刘成均, 韩克宁, 蒋晨, 刘娜娜, 蒙春. 渝东南地区五峰–龙马溪组的烃源岩特征——以渝参7井为例[J]. 石油天然气学报, 2025, 47(4): 790-800. https://doi.org/10.12677/jogt.2025.474088

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