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苏北盆地古近系泥页岩有机质孔发育特征及影响因素
马存飞,董春梅,栾国强,林承焰,刘小岑,段宏亮,刘世丽
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(中国石油大学地球科学与技术学院,山东青岛 266580;中国石油大学地球科学与技术学院,山东青岛 266580;山东省油藏地质重点实验室,山东青岛 266580;中石油油气储层重点实验室中国石油大学研究室,山东青岛 266580;中国石化江苏油田分公司地质科学研究院,江苏扬州 225009)
摘要:
通过对苏北盆地古近系泥页岩研究并结合美国Marcellus页岩研究成果,定义有机质孔的概念,归纳有机质孔的类型及特征,探讨有机质孔发育的影响因素并总结有机质孔演化规律。结果表明:有机质孔泛指在有机质内部或边界处发育并与有机质具有成因联系的所有孔隙,包括原生有机质孔和次生有机质孔两类;有机质孔形态多样,分布具有非均质性,特别当有机质孔大量发育时,其内部结构是具有层状格架的似蜂窝状连通体;温度、上覆岩层压力、无机矿物和流体是影响有机质孔发育的外部条件,有机质类型、有机质成熟度和有机质含量是控制有机质孔发育的内部因素;苏北盆地古近系泥页岩实际样品和热模拟实验样品中有机质孔均表现出阶段性演化特征,这与干酪根热解生烃过程中的组构演化和生烃机制密切相关。
关键词:  有机质孔  类型及特征  外部条件  显微组分  总有机碳  有机质成熟度  演化规律
DOI:10.3969/j.issn.1673-5005.2017.03.001
投稿时间:2016-11-07
基金项目:国家科技重大专项(2017ZX05009-001);国家留学基金项目(201506450031)
Characteristics and influencing factors of organic-matter pores in paleogene shale, Subei Basin
MA Cunfei,DONG Chunmei,LUAN Guoqiang,LIN Chengyan,LIU Xiaocen,DUAN Hongliang,LIU Shili
(School of Geosciences in China University of Petroleum, Qingdao 266580, China;School of Geosciences in China University of Petroleum, Qingdao 266580, China;Reservoir Geology Key Laboratory of Shandong Province, Qingdao 266580, China;Research Laboratory of China University of Petroleum, Key Laboratory of Oil and Gas Reservoir of China National Petroleum Corporation, Qingdao 266580, China;Geological Scientific Research Institute of SINOPEC Jiangsu Oilfield Company, Yangzhou 225009, China)
Abstract:
Based on the study of Paleogene shale in Subei Basin, and combining results of the Marcellus shale, this paper defined the concept of organic-matter pore, summarized its types and characteristics, discussed its influencing factors and finally concluded evolution rule of organic-matter pore. The results show that organic-matter pores generally refer to pores which are within or at the boundary of organic matter and are genetically associated with it, and they include primary and secondary organic-matter pores. Organic-matter pores display various shapes and are distributed heterogeneously. Especially when they are well developed, the internal structure is a honeycomb connecting component in the layered framework. Temperature, overburden pressure, inorganic mineral and fluid are the external conditions influencing the development of organic-matter pores and organic matter type, while maturity and content are the internal factors controlling the development of organic-matter pores. Organic-matter pores of both Paleogene shale samples in Subei Basin and the thermal simulations have the characteristics of episodic evolution, which is closely related to the fabric evolution and hydrocarbon-generating mechanism during the process of hydrocarbon generation from Kerogen.
Key words:  organic-matter pore  type and characteristic  external condition  maceral composition  total organic carbon  maturity  evolution rule