石油与天然气地质 ›› 2022, Vol. 43 ›› Issue (2): 456-466.doi: 10.11743/ogg20220217

• 方法技术 • 上一篇    下一篇

四川盆地中部高石梯-磨溪地区震旦系灯影组储层沥青拉曼光谱分析

李纯泉1,2(), 陈红汉1,2, 肖雪薇1,2, 汪泽成3, 姜华3   

  1. 1.中国地质大学(武汉) 构造与油气资源教育部重点实验室,湖北 武汉 430074
    2.中国地质大学(武汉) 资源学院石油地质系,湖北 武汉 430074
    3.中国石油 勘探开发研究院,北京 100083
  • 收稿日期:2020-08-07 修回日期:2022-01-20 出版日期:2022-04-01 发布日期:2022-03-11
  • 作者简介:李纯泉(1974—),男,博士、副教授,油气成藏和流体包裹体系统分析。E?mail: chunquanli@cug.edu.cn
  • 基金资助:
    国家科技重大专项(2016ZX05004-001)

Raman spectroscopy of bitumen from the Sinian Dengying Formation reservoirs, Gaoshiti-Moxi area, central Sichuan Basin

Chunquan Li1,2(), Honghan Chen1,2, Xuewei Xiao1,2, Zecheng Wang3, Hua Jiang3   

  1. 1.Key Laboratory of Tectonics and Petroleum Resources,Ministry of Education·China University of Geosciences (Wuhan),Wuhan,Hubei 430074,China
    2.Department of Petroleum Geology,School of Earth Resources,China University of Geosciences (Wuhan),Wuhan,Hubei 430074,China
    3.Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083,China
  • Received:2020-08-07 Revised:2022-01-20 Online:2022-04-01 Published:2022-03-11

摘要:

拉曼光谱分析是刻画有机质成熟度的一种有效技术方法。通过对四川盆地中部高石梯-磨溪地区21块震旦系灯影组储层样品中的沥青开展系统的拉曼光谱分析,并用经验公式获取沥青的等效镜质体反射率,表征了沥青所处的成熟阶段,进而探讨了储层经历的热演化及改造作用。结果表明,高石梯-磨溪地区震旦系灯影组储层溶蚀孔洞及裂缝充填沥青绝大多数都处于高-过成熟阶段,占比达81.1 %;沥青拉曼光谱参数在等效镜质体反射率3.0 %处存在明显的转折点,构成两段式变化趋势特征。沥青等效镜质体反射率偏离正常演化趋势的异常高值,记录了储层经历的热异常,是明显的高温热流体活动响应,其空间上的分布特征反映了热流体活动的多期性,表明储层经历了多期热液蚀变改造,佐证了原油裂解成气而构成现今全是气藏分布的格局。

关键词: 拉曼光谱, 成熟度, 储层沥青, 灯影组, 震旦系, 高石梯-磨溪地区, 四川盆地

Abstract:

As an effective technique to characterize the maturity of organic matter, Raman spectroscopy was employed to analyze bitumen in 21 samples from the Sinian Dengying Formation reservoirs in the Gaoshiti-Moxi area, central Sichuan Basin. The equivalent vitrinite reflectance values of the bitumen were calculated with empirical equations to determine the maturity stage of the bitumen and the thermal alternation of reservoirs sampled. The results indicate that most bitumen (81.1 %) filled dissolved pores and fractures are highly to over mature. The Raman spectrums change drastically near the equivalent vitrinite reflectance of 3.0 %, suggesting a two-section evolving trend. Anomalous high equivalent vitrinite reflectance values are typical responses of hot fluid activities, indicating thermal anomalies experienced by the reservoirs. The spatial distribution of the equivalent vitrinite reflectance values also points to the possibility of multiple thermal alteration, which may serve to confirm the assumption that gas is generated from oil cracking and to explain the distribution of current gas reservoirs in the area.

Key words: Raman spectroscopy, maturity, reservoir bitumen, Dengying Formation, Sinian, Gaoshiti-Moxi area, Sichuan Basin

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