论四川盆地侏罗系地层封闭孔隙轻烃的生成

IF 3.7 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Marine and Petroleum Geology Pub Date : 2024-11-12 DOI:10.1016/j.marpetgeo.2024.107208

Fei Liu , Yuanjia Han , Hanyong Bao , Ming Fan , Zhiguo Shu , Tian Dong , Zhiliang He

{"title":"论四川盆地侏罗系地层封闭孔隙轻烃的生成","authors":"Fei Liu , Yuanjia Han , Hanyong Bao , Ming Fan , Zhiguo Shu , Tian Dong , Zhiliang He","doi":"10.1016/j.marpetgeo.2024.107208","DOIUrl":null,"url":null,"abstract":"<div><div>Light hydrocarbons (C<sub>1</sub>-C<sub>9</sub>) offer a specific opportunity to study petroleum generation mechanisms. However, a significant amount of light hydrocarbons evaporate during sample collection, preservation, and preparation. This study aims to identify the origin of light hydrocarbons preserved in the closed pores of Jurassic shale strata from the Sichuan Basin where evaporative losses have been minimized. Twenty-one samples of various maturity levels and lithofacies were investigated using a new approach based on online decrepitation-gas chromatography. Light hydrocarbons were released from the closed pores of finely stratified mudstone, limestone, and siltstone. Among these, gaseous hydrocarbons in the C<sub>1</sub>-C<sub>5</sub> range were utilized to discriminate between petroleum generated by two opposing reactions, i.e., free radical and carbenium ion cracking. Accordingly, <em>in situ</em> petroleum can be divided into three types. (1) Free radical cracking type: a predominance of methane and straight-chain alkanes in the gaseous hydrocarbon range; (2) Carbenium ion cracking type: a deficiency of methane and straight-chain alkanes in gaseous hydrocarbons; (3) Mixed cracking type: their gaseous hydrocarbons exhibit intermediate compositions between those of free radical and carbenium ion cracking types. Differences in the chemical composition of the gaseous hydrocarbons, which can be used to discriminate between the two generation mechanisms, were further supported by variations in the mineral composition, e.g., calcite and mixed-layer clay minerals are characteristic of free radical reaction and carbenium ion reaction, respectively. The present classification diagrams for gaseous hydrocarbons are based on the Jurassic shale strata of the Sichuan Basin. This novel approach for determining the whole range of hydrocarbons from closed pores shows promising prospects for deciphering the origin of light hydrocarbons and thus may be extended to other regions of interest.</div></div>","PeriodicalId":18189,"journal":{"name":"Marine and Petroleum Geology","volume":"171 ","pages":"Article 107208"},"PeriodicalIF":3.7000,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"On the generation of light hydrocarbons from the closed pores of Jurassic strata, Sichuan Basin\",\"authors\":\"Fei Liu , Yuanjia Han , Hanyong Bao , Ming Fan , Zhiguo Shu , Tian Dong , Zhiliang He\",\"doi\":\"10.1016/j.marpetgeo.2024.107208\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Light hydrocarbons (C<sub>1</sub>-C<sub>9</sub>) offer a specific opportunity to study petroleum generation mechanisms. However, a significant amount of light hydrocarbons evaporate during sample collection, preservation, and preparation. This study aims to identify the origin of light hydrocarbons preserved in the closed pores of Jurassic shale strata from the Sichuan Basin where evaporative losses have been minimized. Twenty-one samples of various maturity levels and lithofacies were investigated using a new approach based on online decrepitation-gas chromatography. Light hydrocarbons were released from the closed pores of finely stratified mudstone, limestone, and siltstone. Among these, gaseous hydrocarbons in the C<sub>1</sub>-C<sub>5</sub> range were utilized to discriminate between petroleum generated by two opposing reactions, i.e., free radical and carbenium ion cracking. Accordingly, <em>in situ</em> petroleum can be divided into three types. (1) Free radical cracking type: a predominance of methane and straight-chain alkanes in the gaseous hydrocarbon range; (2) Carbenium ion cracking type: a deficiency of methane and straight-chain alkanes in gaseous hydrocarbons; (3) Mixed cracking type: their gaseous hydrocarbons exhibit intermediate compositions between those of free radical and carbenium ion cracking types. Differences in the chemical composition of the gaseous hydrocarbons, which can be used to discriminate between the two generation mechanisms, were further supported by variations in the mineral composition, e.g., calcite and mixed-layer clay minerals are characteristic of free radical reaction and carbenium ion reaction, respectively. The present classification diagrams for gaseous hydrocarbons are based on the Jurassic shale strata of the Sichuan Basin. This novel approach for determining the whole range of hydrocarbons from closed pores shows promising prospects for deciphering the origin of light hydrocarbons and thus may be extended to other regions of interest.</div></div>\",\"PeriodicalId\":18189,\"journal\":{\"name\":\"Marine and Petroleum Geology\",\"volume\":\"171 \",\"pages\":\"Article 107208\"},\"PeriodicalIF\":3.7000,\"publicationDate\":\"2024-11-12\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Marine and Petroleum Geology\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0264817224005208\",\"RegionNum\":2,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"GEOSCIENCES, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Marine and Petroleum Geology","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0264817224005208","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

摘要

轻烃（C1-C9）为研究石油生成机制提供了一个特殊的机会。然而，大量轻烃在样品采集、保存和制备过程中蒸发。本研究旨在确定保存在四川盆地侏罗纪页岩地层封闭孔隙中的轻烃的来源，这些孔隙中的轻烃蒸发损失最小。采用基于在线降解-气相色谱法的新方法，对不同成熟度和岩性的 21 个样本进行了研究。轻烃从细层泥岩、石灰岩和粉砂岩的封闭孔隙中释放出来。其中，C1-C5 范围内的气态碳氢化合物被用来区分由两种相反反应（即自由基裂解和碳铵离子裂解）生成的石油。因此，原地石油可分为三种类型。(1) 自由基裂解型：气态碳氢化合物中主要是甲烷和直链烷烃；(2) 硒离子裂解型：气态碳氢化合物中缺少甲烷和直链烷烃；(3) 混合裂解型：其气态碳氢化合物的成分介于自由基裂解型和硒离子裂解型之间。气态碳氢化合物化学成分的差异可用于区分两种生成机制，而矿物成分的变化则进一步证明了这一点，例如方解石和混合层粘土矿物分别是自由基反应和硒离子反应的特征。本气态碳氢化合物分类图以四川盆地侏罗纪页岩地层为基础。这种从封闭孔隙中测定全系列碳氢化合物的新方法为破译轻质碳氢化合物的起源展示了广阔的前景，因此可以推广到其他感兴趣的地区。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

查看原文本刊更多论文

On the generation of light hydrocarbons from the closed pores of Jurassic strata, Sichuan Basin

Light hydrocarbons (C₁-C₉) offer a specific opportunity to study petroleum generation mechanisms. However, a significant amount of light hydrocarbons evaporate during sample collection, preservation, and preparation. This study aims to identify the origin of light hydrocarbons preserved in the closed pores of Jurassic shale strata from the Sichuan Basin where evaporative losses have been minimized. Twenty-one samples of various maturity levels and lithofacies were investigated using a new approach based on online decrepitation-gas chromatography. Light hydrocarbons were released from the closed pores of finely stratified mudstone, limestone, and siltstone. Among these, gaseous hydrocarbons in the C₁-C₅ range were utilized to discriminate between petroleum generated by two opposing reactions, i.e., free radical and carbenium ion cracking. Accordingly, in situ petroleum can be divided into three types. (1) Free radical cracking type: a predominance of methane and straight-chain alkanes in the gaseous hydrocarbon range; (2) Carbenium ion cracking type: a deficiency of methane and straight-chain alkanes in gaseous hydrocarbons; (3) Mixed cracking type: their gaseous hydrocarbons exhibit intermediate compositions between those of free radical and carbenium ion cracking types. Differences in the chemical composition of the gaseous hydrocarbons, which can be used to discriminate between the two generation mechanisms, were further supported by variations in the mineral composition, e.g., calcite and mixed-layer clay minerals are characteristic of free radical reaction and carbenium ion reaction, respectively. The present classification diagrams for gaseous hydrocarbons are based on the Jurassic shale strata of the Sichuan Basin. This novel approach for determining the whole range of hydrocarbons from closed pores shows promising prospects for deciphering the origin of light hydrocarbons and thus may be extended to other regions of interest.

求助全文

通过发布文献求助，成功后即可免费获取论文全文。去求助

来源期刊

Marine and Petroleum Geology 地学-地球科学综合

CiteScore

8.80

自引率

14.30%

发文量

475

审稿时长

63 days

期刊介绍： Marine and Petroleum Geology is the pre-eminent international forum for the exchange of multidisciplinary concepts, interpretations and techniques for all concerned with marine and petroleum geology in industry, government and academia. Rapid bimonthly publication allows early communications of papers or short communications to the geoscience community. Marine and Petroleum Geology is essential reading for geologists, geophysicists and explorationists in industry, government and academia working in the following areas: marine geology; basin analysis and evaluation; organic geochemistry; reserve/resource estimation; seismic stratigraphy; thermal models of basic evolution; sedimentary geology; continental margins; geophysical interpretation; structural geology/tectonics; formation evaluation techniques; well logging.