岩石热解实验在页岩油储层含油性评价中的应用——以川东北地区侏罗系凉高山组为例

doi:10.3969/j.issn.1672-7703.2024.01.013

摘要/Abstract

摘要： 页岩油是保障国家长期稳产和上产的重要战略资源，含油性及可动性评价在页岩油勘探甜点预测中具有重要指导意义。采用液氮冷冻取制样和岩石热解实验方法，对川东北地区侏罗系凉高山组页岩油层系开展含油性及可动性评价实验研究和含油性影响因素分析，取得以下4点认识：（1）液氮冷冻取制样技术可有效避免样品中的轻烃损失，所获含油性参数可更为真实地反映储层含油性；（2）分段岩石热解方法可通过游离油、束缚油及固态烃含量表征储层含油性，并通过最大可动油量占比（游离油含量/总含油量）表征原油可动性；（3）凉高山组页岩油储层含油性和可动性受有机质丰度、成熟度、岩性和烃源体系的运移排烃及烃类运聚作用的共同影响，有机质丰度越大储层含油性越好，成熟度越高原油可动性越强，但储层含油性越好和可动性越强，原油越容易在储层中发生短距离运聚现象，从而改变储层含油性；（4）综合分析凉一段、凉三段的含油性、可动性、地球化学特征、物性和页岩油井的开发需求，发现凉一段为优质页岩油勘探层段。岩石热解实验手段为页岩油含油性及可动性评价提供了新思路和新方法，可有效支撑页岩油甜点区预测和开发方案设计。

关键词: 页岩油, 冷冻取制样, 分段岩石热解, 含油性, 可动性, 川东北, 凉高山组

Abstract: Shale oil is an important strategic resource to ensure China’s long-term steady and increase of oil production. The evaluation of oil-bearing property and oil mobility has an important guiding significance in sweet spot prediction in shale oil exploration. By applying the liquid nitrogen freezing sampling and rock pyrolysis experiment methods, experimental research on oil-bearing property and mobility evaluation of shale oil series in the Jurassic Lianggaoshan Formation in northeastern Sichuan Basin is conducted, and the influencing factors of oil-bearing property are analyzed. As a result, understanding is obtained in the following four aspects: (1) The liquid nitrogen freezing sampling technology effectively avoids the loss of light hydrocarbons in samples, and the obtained oil-bearing property parameters can better reflect the oil-bearing property of the reservoir; (2) By using the multi-stage rock pyrolysis method, the oil-bearing property is characterized by free oil, bound oil, and solid hydrocarbon content, and the oil mobility is characterized by the proportion of maximum mobile oil content (free oil/total oil content); (3) The oil-bearing property and mobility of shale oil reservoir in Lianggaoshan Formation are jointly affected by organic matter abundance, maturity, lithology, as well as hydrocarbon expulsion, migration, and accumulation in the source rock system. The greater the organic matter abundance, the higher the oil-bearing property of the reservoir, and the higher the maturity, the better the oil mobility. However, a better oil-bearing property and oil mobility will more easily cause the short-distance oil migration and accumulation in the reservoir, thus changing the oil-bearing property of the reservoir; (4) After the comprehensive analysis of oil-bearing property, oil mobility, geochemical characteristics, physical properties of the first and the third members of Lianggaoshan Formation, as well as the development demands of shale oil wells, it is found that the first member of Lianggaoshan Formation is a high-quality interval for shale oil exploration. The rock pyrolysis experiment provides a new idea and method for the evaluation of shale oil-bearing property and oil mobility, which effectively supports the prediction of shale oil sweet spot area and the design of development plan.

中图分类号:

TE125.3

陈曼霏, 王丽, 何家欢, 谭杰, 洪海涛, 赵丹, 孔令明, 蔡长宏, 谭雅倩. 岩石热解实验在页岩油储层含油性评价中的应用——以川东北地区侏罗系凉高山组为例[J]. 中国石油勘探, 2024, 29(1): 166-176.

Chen Manfei, Wang Li, He Jiahuan, Tan Jie, Hong Haitao, Zhao Dan, Kong Lingming, Cai Changhong, Tan Yaqian. Application of rock pyrolysis experiment in oil-bearing property evaluation of shale oil reservoir: a case study of the Jurassic Lianggaoshan Formation in the northeastern Sichuan Basin[J]. China Petroleum Exploration, 2024, 29(1): 166-176.

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