摘要
黔北习水地区在五峰-龙马溪组广泛发育优质页岩。本文对习科1井和习科2井五峰-龙马溪组页岩岩芯样品的地球化学特征、孔隙发育特征和含气量进行了分析,并评价了该地区的页岩气资源潜力。研究结果表明:习水地区五峰-龙马溪组优质页岩(TOC>2%)的厚度约为30 m,成熟度较高,脆性矿物含量高,孔隙发育,含气量大。另外,我们运用PetroMod软件恢复了习科1井的埋藏史和热演化史,模拟结果显示习水地区主要经历了4期剥蚀事件和1期热异常事件;该地区五峰-龙马溪组页岩的最大埋深约为5300 m,现今成熟度约为2.20%。总体上讲,习水背斜北西翼地区的构造稳定,五峰-龙马溪组页岩的埋藏适中,容易形成超压的保存条件,拥有良好的页岩气勘探开发前景。
High-quality marine shale occurs in the Wufeng-Longmaxi Formation in the Xishui Area,North Guizhou.We evaluated the shale gas resource of the Wufeng-Longmaxi Formation in the Xishui Area based on the analysis of geochemical characteristics,pore structure,and gas content of core samples from Wells XK1 and XK2.The research showed that the thickness of high-quality shale(TOC>2%)of the Wufeng-Longmaxi Formation was about 30 m,and the characteristics of high-quality shale were of high thermal maturity,high brittle minerals and high gas content.In addition,we recovered the burial and thermal histories of the Wufeng-Longmaxi Formation of Well XK1 by using PetroMod software.The basin modeling results showed that the Xishui Area had experienced four erosion events and one abnormal heat-flow event.The deepest burial depth of the Wufeng-Longmaxi shale was 5300 m,and the current thermal maturity(Ro)is 2.20%.Based on the results above,the Wufeng-Longmaxi shale of the northwestern limb zone of the Xishui anticline is prospective for exploration and development of shale gas,because the shale in this area has moderate burial depth,stable tectonic conditions,and better preservation conditions than other areas.
作者
史树勇
孙宇
郭慧娟
邓瑞
陈承声
王云鹏
SHI Shu-yong;SUN Yu;GUO Hui-juan;DENG Rui;CHEN Cheng-sheng;and WANG Yun-peng(State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《地球化学》
CAS
CSCD
北大核心
2019年第6期567-579,共13页
Geochimica
基金
中国科学院战略性先导科技专项(B类)(XDB10010300)
中国科学院战略性先导科技专项(A类)(XDA14010103)
中国科学院广州地球化学研究所“一三五”项目(135TP201602)
国家油气重大专项(2017ZX05008-002-030)
关键词
五峰-龙马溪页岩
含气量
埋藏史
热演化史
保存条件
习水地区
Wufeng-Longmaxi shale
gas content
burial history
thermal history
preservation condition
Xishui Area
