油气藏评价与开发 ›› 2019, Vol. 9 ›› Issue (5): 40-44.

• 页岩气地质 • 上一篇    下一篇

彭水及邻区五峰—龙马溪组成烃生物特征及意义

杨振恒1,2,翟常博1,2,邓模1,2,鲍云杰1,2,张培先3,张庆珍1,2,谢小敏1,2   

  1. 1. 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
    2. 页岩油气富集机理与有效开发国家重点实验室,江苏 无锡 214126
    3. 中国石化华东油气分公司勘探开发研究院,江苏 南京 210011
  • 收稿日期:2019-07-09 出版日期:2019-10-26 发布日期:2019-10-26
  • 作者简介:杨振恒(1979 —),男,硕士,高级工程师,从事非常规油气研究工作。通讯地址:江苏省无锡市蠡湖大道2060号无锡石油地质研究所,邮政编码:214126。E-mail:yangzh. syky@sinopec.com
  • 基金资助:
    国家科技重大专项“生物烃演化对常压页岩气富集的控制作用”(2015ZX05061001);国家自然科学基金重点项目“复杂构造—成岩背景下海相页岩有机孔隙演化与晚期差异保存研究”(41972164);“十三五”国家科技重大专项“彭水地区常压页岩气勘探开发示范工程”(2016X05061)

Characteristics and significance of hydrocarbon-forming organisms of Wufeng-Longmaxi formation in Pengshui and its adjacent areas

YANG Zhenheng1,2,ZHAI Changbo1,2,DENG Mo1,2,BAO Yunjie1,2,ZHANG Peixian3,ZHANG Qingzhen1,2,XIE Xiaomin1,2   

  1. 1. Wuxi Petroleum Geology Research Institute, Sinopec Petroleum Exploration and Production Research Institute, Wuxi, Jiangsu 214126, China
    2. State Key Laboratory of Shale Oil and Gas Accumulation Mechanism and Effective Development, Wuxi, Jiangsu 214126, China
    3. Exploration and Development Research Institute, Sinopec East China Oil and Gas Company, Nanjing, Jiangsu 210011, China
  • Received:2019-07-09 Online:2019-10-26 Published:2019-10-26

摘要:

通过全岩光片有机显微组分和扫描电镜观察,对彭水及邻区典型取心井上奥陶统五峰组—下志留统龙马溪组黑色页岩成烃生物系统进行镜下观察、分类和研究。结果表明,彭水及邻区五峰—龙马溪组页岩主要成烃生物类型有藻类体(浮游藻、疑源类、底栖藻等)、动物碎屑(笔石、放射虫、几丁虫和有孔虫)和细菌等。其中五峰—龙马溪组富有机质页岩(TOC≥2.0 %)主要成烃生物类型有浮游藻、疑源类、细菌、笔石等,富有机质页岩段成烃生物具有较高的丰度和分异度。成烃生物不仅仅是油气的主要来源,而且其经过复杂热演化作用后生成的有机孔还是页岩气赋存的主要载体。因此,在五峰—龙马溪组富有机质页岩段,存在较好的源储耦合关系,是最佳的地质甜点层。

关键词: 彭水及邻区, 五峰—龙马溪组;, 成烃生物, 组合特征, 有机孔

Abstract:

By the observation of the organic microscopic composition and scanning electron microscopy of the whole rock, the black shale of the Upper Ordovician Wufeng-Lower Silurian Longmaxi formation in Pengshui and its adjacent core wells Microscopic observation, classification and research of hydrocarbon-forming organism systems. It is found that the main hydrocarbon-forming organism types of shale in Pengshui and its adjacent areas are alginite(phytoplankton, suspected sources, benthic algae, etc.), animal debris(graptolite, radiolarian, chitinozoa and foraminifera) and bacteria, etc. Among them, the main hydrocarbon-forming organisms in organic-rich shale in Wufeng-Longmaxi formation(TOC≥2.0 %) are phytoplankton, suspected sources, bacteria, graptolite, etc., which have high abundance and differentiation. Hydrocarbon-forming organisms are the main source of oil and gas, meanwhile, the organic pores formed after its complex thermal evolution are the main carriers of shale gas occurrence. As there is a good coupling relationship between source and reservoir in the organic-rich shale section of Wufeng-Longmaxi formation, it is supposed to be the best geological sweet spot layer.

Key words: Pengshui and its adjacent area, Wufeng-Longmaxi formation, hydrocarbon-forming organism, combined characteristic, organic pore

中图分类号: 

  • TE122