沧东凹陷孔二段低熟页岩纳米孔隙特征及主控因素

doi:10.3969/j.issn.1006-6535.2021.02.003

特种油气藏 ›› 2021, Vol. 28 ›› Issue (2): 20-26.DOI: 10.3969/j.issn.1006-6535.2021.02.003

沧东凹陷孔二段低熟页岩纳米孔隙特征及主控因素

张盼盼^1,2,3, 刘小平^1,2, 关铭^1,2, 孙彪^1,2

1.油气资源与探测国家重点实验室,北京 102249;
2.中国石油大学(北京),北京 102249;
3.中国地质大学(北京),北京 100083

收稿日期:2020-05-08 修回日期:2020-12-30 出版日期:2021-04-25 发布日期:2022-02-16
通讯作者: 刘小平(1971—),男,副教授,博士生导师,1993年毕业于西南石油学院石油地质勘查专业,2002年毕业于石油大学(北京)矿产普查与勘探专业,获博士学位,现从事石油地质学教学与研究工作。
作者简介:张盼盼(1990—),女,讲师,2012年毕业于中国石油大学(北京)地质工程专业,2015年毕业于该校矿产普查与勘探专业,获硕士学位,现主要从事页岩油气调查研究工作。
基金资助:
国家自然科学基金面上项目“辉绿岩侵入作用对陆相页岩油源储系统的影响机理研究——以苏北盆地为例”(42072150)、“湖相未熟—低熟页岩油形成与聚集机理”(41372144);国家科技重大专项“中国陆相页岩油资源潜力与地质评价研究”(2017ZX05049001-008)

Study on Characteristics and Main Controlling Factors of Nano-pores in Low-maturity Shale Reservoirs in Member 2 of Kongdian Formation in Cangdong Sag

Zhang Panpan^1,2,3, Liu Xiaoping^1,2, Guan Ming^1,2, Sun Biao^1,2

1. State Key Laboratory of Petroleum Resources and Prospecting (China University of Petroleum (Beijing)), Beijing 102249, China;
2. China University of Petroleum (Beijing), Beijing 102249, China;
3. China University of Geosciences (Beijing), Beijing 100083, China

Received:2020-05-08 Revised:2020-12-30 Online:2021-04-25 Published:2022-02-16

摘要/Abstract

摘要： 为深入研究湖相低熟页岩储层纳米孔隙特征和主控因素,选取黄骅坳陷沧东凹陷孔二段12块样品分别进行X衍射、有机地球化学测试、扫描电镜、低温氮气吸附等测试工作,对孔二段页岩储层进行分析。结果表明:沧东凹陷孔二段页岩总有机碳含量为0.48%~7.23%,有机质热演化程度为0.45%~0.84%,整体上处于低熟阶段;页岩纳米孔隙的晶间孔、溶蚀孔隙、有机质收缩缝发育丰度较高,有机质孔次之;纳米孔隙形态整体上呈较开放的状态,孔隙结构以中孔和宏孔为主;页岩孔体积的变化受机械压实、有机质生烃、黏土矿物转化等因素的综合影响,孔体积与黏土矿物含量和总有机碳含量呈一定的正相关性,有机质的赋存形式是页岩有机质孔发育的关键因素。该成果为湖相低熟页岩储层评价提供了理论依据,对湖相低熟页岩资源评价具有一定的参考价值。

关键词: 页岩储层, 影响因素, 孔隙特征, 低成熟, 孔二段, 沧东凹陷

Abstract: In order to deeply study the characteristics and main controlling factors of nano-pores in lacustrine low-mature shale reservoirs, 12 samples was taken from the Member 2 of Kongdian Formation in Cangdong Sag, Huanghua Depression, and tested for X-ray diffraction, organic geochemical testing, electron microscopy scanning, and low-temperature nitrogen adsorption to analyze the shale reservoirs in Member 2 of Kongdian Formation. The results indicated that the total content of organic carbon of the shale in the Member 2 of Kongdian Formation in Cangdong Sag was 0.48% to 7.23%, and the thermal evolution of organic substances was 0.45% to 0.84%, indicating that the shale was in the low-mature stage as a whole; the nano-pores in the shale were developed with an abundance of intercrystal pores, dissolved pores and shrinkage joints of organic substances, followed by organic substance pores; the nano-pores were relatively open as a whole, and mainly composed of mesopores and macropores in structure; the shale pore volume was changed mainly by the comprehensive effects of mechanical compaction, hydrocarbon generation of organic substances, transformation of clay minerals, and other factors; there was a positive correlation between pore volume and mineral content in clay and total content of organic carbon; the occurrence form of organic substances was the key factor for pore development of organic substances in shale. The results provide a theoretical basis for the evaluation of lacustrine low-maturity shale reservoirs, and serve as references for the evaluation of lacustrine low-maturity shale resources.

Key words: shale reservoirs, influencing factors, pore characteristics, low maturity, in Member 2 of Kongdian Formation, Cangdong Sag

中图分类号:

TE122

张盼盼, 刘小平, 关铭, 孙彪. 沧东凹陷孔二段低熟页岩纳米孔隙特征及主控因素[J]. 特种油气藏, 2021, 28(2): 20-26.

Zhang Panpan, Liu Xiaoping, Guan Ming, Sun Biao. Study on Characteristics and Main Controlling Factors of Nano-pores in Low-maturity Shale Reservoirs in Member 2 of Kongdian Formation in Cangdong Sag[J]. Special Oil & Gas Reservoirs, 2021, 28(2): 20-26.

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沧东凹陷孔二段低熟页岩纳米孔隙特征及主控因素

Study on Characteristics and Main Controlling Factors of Nano-pores in Low-maturity Shale Reservoirs in Member 2 of Kongdian Formation in Cangdong Sag

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