鄂西建始地区五峰-龙马溪组黑色页岩生物地层特征  

Biostratigraphic Characteristics of Black Graptolite Shale in Wufeng Formation and Longmaxi Formation in Jianshi Area of West Hubei

作　　者：周志 姜振学 李世臻 徐桂红[3] 王胜建 郭天旭 童川川 Zhou Zhi;Jiang Zhenxue;Li Shizhen;Xu Guihong;Wang Shengjian;Guo Tianxu;Tong Chuanchuan(Institute of Unconventional Natural Gas Research,China University of Petroleum,Beijing 102249,China;Oil and Gas Survey Center,China Geological Survey,Beijing 100083,China;School of Energy Resources,China University of Geosciences,Beijing 100083,China)

机构地区：[1]中国石油大学非常规油气科学技术研究院,北京102249 [2]中国地质调查局油气资源调查中心,北京100083 [3]中国地质大学能源学院,北京100083

出　　处：《地球科学》2021年第2期432-443,共12页Earth Science

基　　金：国家科技重大专项(No.2016ZX05034001-001);中国地质调查局项目(No.DD20189812)。

摘　　要：鄂西建始地区五峰组-龙马溪组黑色页岩发育,尚未建立古生物地层序列.基于建地1井及湘鄂渝地区23个穿越奥陶系和志留系钻井、剖面资料,研究建始地区五峰组-龙马溪组黑色页岩笔石序列,分析湘鄂水下高地演化模式及其对页岩气成藏影响.建地1井从奥陶系Dicellograptus complexus(WF2)带至志留系Stimulograptus sedgwickii(LM8)带,共包含8个笔石带,缺失了Perculpto gr.perculptus(LM1)、Akidograptus ascensus(LM2)和Parakido gr.acuminatus(LM3)三个笔石带,表明建始地区在赫南特期至鲁丹早期处在湘鄂水下高地范围内.受控于全球海平面变化和广西运动双重作用,湘鄂水下高地整体呈现出自凯迪期至鲁丹早期不断隆升、影响范围逐渐扩大,鲁丹中晚期再逐渐回缩的演化模式;在其范围内普遍缺失WF3-LM4部分笔石带富有机质页岩,导致页岩气藏抗构造破坏能力差,勘探风险较大.The black shale of Wufeng Formation of Upper Ordovician and Longmaxi Formation of Lower Silurian is developed in Jianshi area of West Hubei,but no paleontological stratigraphic sequence has been established.Based on drill core of Well JD-1,the top and bottom boundaries and black graptolite shale sequences from the Wufeng Formation to the Longmaxi Formation in Jianshi area are studied.The evolution model of Xiang’e underwater highland during the Ordovician-Silurian boundary period and its influence on shale gas exploration are discussed.Well JD-1 occured eight graptolitic biozones between Late Ordovican(Katian)Dicellograptus complexus Zone and Llandovery(Aeronian)Stimulograptus sedgwicki Zone,missing three graptolitic biozones,including the Perculpto gr.perculptus Zone,Akidograptus ascensus Zone and Parakido gr.acuminatus Zone.It is confirmed that Jianshi area was located in the Xiang’e underwater highland during the period from the Hernant to the early Ludan.The Xiang’e underwater highland is developed in the border area of Hubei and Hunan provinces,which is mainly controlled by global sea level change and the Guangxi movement caused by agglomeration and ablation of Gondwana continental glacier,and the overall situation shows that the evolution is constantly rising from the Kaidi to the Early Rhuddanian,the influence scope is gradually expanding,and then gradually shrinks back in the Early-Middle Rhuddanian.The results suggest that the ability of shale gas reservoirs to resist structural damage is weak and the exploration risk is high in Jianshi area,due to the lack of organic-rich shale from WF3 to LM4.

关 键 词：建地1井 建始地区 五峰组 龙马溪组 湘鄂水下高地 页岩气 石油地质 

分 类 号：P618.13[天文地球—矿床学]