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缝合线有机质富集及流体运移意义——以鄂尔多斯盆地奥陶系碳酸盐岩为例
高岗,王轩,张维维,董岩,王程程,李佳烨
1 中国石油大学(北京)油气资源与探测国家重点实验室, 北京 102249 2 中国石油新疆油田分公司勘探开发研究院, 克拉玛依 834000
Significance of stylolite on organic matter enrichment and fluid migration: A case study on stylolite in the Ordovician carbonate rocks of Ordos Basin
GAO Gang, WANG Xuan, ZHANG Weiwei, DONG Yan, WANG Chengcheng, LI Jiaye
1 State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum-Beijing, Beijing 102249, China 2 Exploration & Development Institute, Xinjiang Oil Field Company, PetroChina, Karamay, 834000, China

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摘要  本文选取鄂尔多斯盆地中东部含缝合线的奥陶系海相碳酸盐岩样品,分别对缝合线和基质进行了岩石铸体薄片、荧光薄片镜下观察、有机碳含量测试、热解分析、全岩X-射线衍射矿物成分以及扫描电镜等一系列实验分析测试,以分析碳酸盐岩缝合线对有机质富集与油气运移的作用。研究表明,缝合线有机质丰度比基质高,含油性比其周围的基质要好,但二者母质类型相近。缝合线中有含量相对较多的黏土、石英、白云石、黄铁矿、黑色沥青、有机质和含量相对较少的方解石。缝合线物质颗粒之间一般呈基底胶结、杂基支撑,其孔隙发育程度、孔隙类型和孔隙密集程度要好于基质,利于油气的运移。总体表明缝合线对于低有机质丰度碳酸盐岩有机质富集、油气生成和流体运移都具有积极作用。
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关键词 : 碳酸盐岩, 缝合线, 基质, 有机质富集, 流体运移
Abstract

  In this paper, Ordovician stylolite-bearing marine carbonate rock samples in the eastern-middle part of the Ordos Basin were selected and analyzed. A series of analytical experiments such as observation of casting thin section and fluorescent thin section, TOC test, Rock-Eval pyrolysis, X-ray diffraction of whole rock, and scanning electron microscopy were conducted to analyze the effect of stylolites in carbonate rocks on organic matter enrichment and hydrocarbon migration. It is indicated in the study that the stylolites represent higher TOC content and better oil-bearing properties than that of the neighboring matrix; however, the two contain similar kerogen type. The stylolite contains a relatively higher content of clay, quartz, dolomite, pyrite, and black bitumen; but relatively lower content of calcite. The grains in the stylolite generally represent basal cementation and matrix supported features. The pore developmental degree, pore types, and pore developmental density are better than that of the matrix, favoring the migration of hydrocarbon. In general, the stylolite demonstrates a positive effect on the organic matter enrichment, hydrocarbon generation, and fluid in carbonate rock with low organic matter abundance.

Key words: carbonate rocks stylolite matrix organic matter enrichment fluid migration
收稿日期: 2016-08-16     
PACS:    
基金资助:国家自然科学基金项目《碳酸盐岩缝合线有机质富集与油气运移作用研究》(41372142)资助
通讯作者: gaogang2819@sina.com
引用本文:   
高岗,王轩,张维维,董岩,王程程,李佳烨. 缝合线有机质富集及流体运移意义——以鄂尔多斯盆地奥陶系碳酸盐岩为例[J]. 石油科学通报, 2017, 2(1): 1-11. GAO Gang, WANG Xuan, ZHANG Weiwei, DONG Yan, WANG Chengcheng, LI Jiaye. Significance of stylolite on organic matter enrichment and fluid migration: A case study on stylolite in the Ordovician carbonate rocks of Ordos Basin. Petroleum Science Bulletin, 2017, 2(1): 1-11.
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