川东南涪陵地区五峰—龙马溪组硅质页岩的生物成因及其油气地质意义

卢龙飞; 秦建中; 申宝剑; 腾格尔; 刘伟新; 张庆珍

doi:10.11781/sysydz201604460

川东南涪陵地区五峰—龙马溪组硅质页岩的生物成因及其油气地质意义

doi: 10.11781/sysydz201604460

卢龙飞^1,2,
秦建中^1,2,
申宝剑^1,2,
腾格尔^1,2,
刘伟新^1,2,
张庆珍^1,2

1.
中国石化油气成藏重点实验室, 江苏无锡 214126
2. 中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126

基金项目: 国家自然科学基金（U1562106）和中国石化科技部项目（P15097）资助。

详细信息

作者简介:
卢龙飞(1977—),博士,从事油气地球化学和非常规油气地质研究。E-mail:lulf.syky@sinopec.com。

中图分类号: TE122.1
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出版历程
- 收稿日期: 2016-03-10
- 修回日期: 2016-06-10
- 刊出日期: 2016-07-28

Biogenic origin and hydrocarbon significance of siliceous shale from the Wufeng-Longmaxi formations in Fuling area, southeastern Sichuan Basin

1.
SINOPEC Key Laboratory of Hydrocarbon Accumulation, Wuxi, Jiangsu 214126, China
2. Wuxi Research Institute of Petroleum Geology, Wuxi, Jiangsu 214126, China

摘要

摘要: 为研究川东南地区五峰—龙马溪组富有机质硅质页岩的成因，选取川东南涪陵页岩气探区钻井岩心样品，采用X射线衍射（XRD）、光学显微镜、环境扫描电子显微镜和能谱仪开展了岩石的矿物组成、微观形貌和成分与结构特征研究。五峰组和龙马溪组下段页岩的矿物组成以石英为主，向上至龙马溪组中部和上部石英含量逐渐降低，黏土矿物含量明显增加。镜下观察到大量具清晰圈层状生长结构和针状结构的生物残体和碎屑，特别是在五峰组和龙马溪组下段尤为丰富，外观具有放射虫和海绵骨针的典型形貌特征。前者内部具有明显的圈层和外部裙边状结构，碎屑骨架与内部充填物质均为微晶石英；碎屑间更小粒级的石英颗粒则多呈不规则球状或椭球状，自形程度低，充填在矿物基质中，应属生物硅质溶解再沉淀形成的自生石英。后者则以较完整和碎屑两种形式呈分散状分布在矿物基质中。五峰—龙马溪组高丰度硅质生物及其硅质重结晶产物的存在，为该段硅质页岩的生物成因提供了直接证据，具有古生产力恢复、水体沉积环境追溯、微观孔隙结构和岩石力学分析等多方面重要的油气地质意义。
- 石英 /
- 生物成因硅 /
- 硅质页岩 /
- 五峰—龙马溪组 /
- 涪陵地区 /
- 川东南
Abstract: Drill core samples were collected from the Fuling area in the southeastern Sichuan Basin to study the origin of siliceous shale rich in organic matter in the Wufeng-Longmaxi formations. X-ray diffraction, optical microscopy, scanning electron microscopy and energy dispersive spectroscopy were applied to study the mineral components, micro-morphology and structure of the samples. Quartz is dominant in the lower part of Wufeng-Longmaxi formations, and decreases gradually upwards, while clay content increases. Abundant biological residue and debris with circled growth structure and needle structure were clearly observed, especially in the Wufeng Formation and the lower part of Longmaxi Formation. The circled structure has a skirt-like boundary, and was filled with microcrystalline quartz. Smaller quartz grains among biological residues are like irregular balls or ellipsoids. They are not idiomorphic, and are authigenic quartz via silica precipitation from siliceous organism dissolution. Debris scattered in mineral matrix, either in complete or clastic form. The enrichment of siliceous organisms and siliceous recrystallization provide direct biogenic evidence for siliceous shale in the Wufeng-Longmaxi formations, which has an important significance for potential hydrocarbon recovery, water sedimentary environment trace, micro-pore and fracture structure, and rock mechanics analysis.
- quartz /
- biogenic silica /
- siliceous shale /
- Wufeng-Longmaxi formations /
- Fuling area /
- southeastern Sichuan Basin

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