天然气地质学

四川盆地龙马溪组页岩有机孔隙SEM表征及成因分析

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  • 兰州大学地质科学与矿产资源学院/甘肃省西部矿产资源重点实验室,甘肃 兰州 730000
闫建萍(1974-),女,甘肃榆中人,副教授,博士后,主要从事石油与天然气地质地球化学研究. E-mail:yanjp@lzu.edu.cn.

收稿日期: 2015-03-27

  修回日期: 2015-05-22

  网络出版日期: 2015-08-10

基金资助

国家重点基础研究发展计划(“973”)(编号:2012CB214701);国家自然科学基金(编号:41202095);博士学科点专项科研基金(新教师)(编号:20120211120032);教育部科学技术研究重大项目(编号:311010)联合资助.

Characterization of Organic Matter-hosted Pores by SEM Method and Their Formation Mechanisms for Shales of Longmaxi Formation,Sichuan Basin

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  • School of Earth Sciences & Key Laboratory of Western China′s Mineral Resources of Gansu Province,Lanzhou University,Lanzhou 730000,China

Received date: 2015-03-27

  Revised date: 2015-05-22

  Online published: 2015-08-10

摘要

研究表明,泥页岩中不同有机母质类型可以发育不同特征的有机质孔隙。用Ar离子抛光场发射扫描电镜照片观察结合XRD分析、EDS能谱分析和相关岩石学标准,将四川盆地龙马溪组泥岩有机质孔隙分为3种类型:热解沥青内部有机质孔(Ⅰ型)、顺矿物边界发育的线性有机质孔(Ⅱ型)、干酪根残余物孔隙(Ⅲ型)。其中,Ⅰ型有机质孔发育于运移后的固体沥青和残余沥青中,Ⅱ型有机质孔的形成机制尚不明确,Ⅲ型有机质孔发育于原始沉积的干酪根残余物内部。热解沥青孔隙能为页岩气体流动提供更有效和连续的渗透路径。

本文引用格式

闫建萍,贾祥娟,邵德勇,张瑜,张同伟 . 四川盆地龙马溪组页岩有机孔隙SEM表征及成因分析[J]. 天然气地球科学, 2015 , 26(8) : 1540 -1546 . DOI: 10.11764/j.issn.1672-1926.2015.08.1540

Abstract

This study illustrated that the organic matter-hosted pores vary significantly in different organic matter matrix. Three types of organic matter-hosted pores were identified in the shales of Longmaxi Formation in Sichuan Basin by combining field emission scanning electron microscopy(FE-SEM)images,X-ray diffraction and energy dispersive spectrum analysis. Pores of TypeⅠorganic matter are observed in migrated pyrobitumen. Pores of TypeⅡorganic matter are aligned parallel to the mineral edges. Pores of Type Ⅲ organic matter develop in residual kerogen. Pores of TypeⅠorganic matter are formed from the exsolution of gaseous hydrocarbons during the secondary thermal cracking of retained oil. The mechanism of typeⅡorganic matter pores remains unclear,and pores of type Ⅲ organic matter are related to the residual kerogen after hydrocarbon generation. Pores of TypeⅠorganic matter can provide more extensive connected pathways than other isolated organic matter pores as in kerogen.

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