石油学报 ›› 2021, Vol. 42 ›› Issue (10): 1325-1336.DOI: 10.7623/syxb202110006

• 地质勘探 • 上一篇    下一篇

渤海湾盆地廊固凹陷杨税务潜山油气成藏的流体包裹体证据

杨德相1, 陈勇2, 李小冬3, 周振柱4, 田建章1, 侯凤香1, 王元杰1, 冯艳伟2, 高婷1, 李玉帮1, 王淼2, 张辉2, 刘听雨2   

  1. 1. 中国石油华北油田公司勘探开发研究院 河北任丘 062552;
    2. 中国石油大学(华东)地球科学与技术学院 山东青岛 266580;
    3. 中国石油华北油田公司勘探事业部 河北任丘 062552;
    4. 山东科技大学地球科学与工程学院 山东青岛 266580
  • 收稿日期:2020-12-09 修回日期:2021-05-26 出版日期:2021-10-25 发布日期:2021-11-03
  • 通讯作者: 陈勇,男,1976年2月生,1999年获石油大学学士学位,2006年获中国石油大学(华东)博士学位,现为中国石油大学(华东)教授,主要从事地质流体和油气成藏方面的研究工作。Email:yongchenzy@upc.edu.cn
  • 作者简介:杨德相,男,1966年3月生,1987年获成都理工大学学士学位,现为中国石油华北油田公司勘探开发研究院教授级高级工程师,主要从事石油地质方面的研究工作。Email:yjy_ydx@petrochina.com.cn
  • 基金资助:
    国家自然科学基金项目(No.41873070)和中国石油天然气股份有限公司科技重大专项(2017E-15)资助。

Evidence from fluid inclusions for hydrocarbon accumulation of Yangshuiwu buried hill in Langgu sag, Bohai Bay Basin

Yang Dexiang1, Chen Yong2, Li Xiaodong3, Zhou Zhenzhu4, Tian Jianzhang1, Hou Fengxiang1, Wang Yuanjie1, Feng Yanwei2, Gao Ting1, Li Yubang1, Wang Miao2, Zhang Hui2, Liu Tingyu2   

  1. 1. Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Hebei Renqiu 062552, China;
    2. School of Geoscience, China University of Petroleum, Shandong Qingdao 266580, China;
    3. Department of Exploration, PetroChina Huabei Oilfield Company, Hebei Renqiu 062552, China;
    4. College of Earth Science and Engineering, Shandong University of Science and Technology, Shandong Qingdao 266580, China
  • Received:2020-12-09 Revised:2021-05-26 Online:2021-10-25 Published:2021-11-03

摘要: 廊固凹陷杨税务潜山凝析油天然气藏是近年来渤海湾盆地的重要勘探发现,但对其油气成藏过程的认识还不够深入。通过对潜山储层中的流体包裹体进行岩相学、显微测温、拉曼光谱和PVT模拟等分析表明,储层中主要发育5类流体包裹体,即气液两相盐水包裹体、气体包裹体、气液两相烃类包裹体、气液两相富气包裹体和单液相烃类包裹体。杨税务潜山主要发育2期油气成藏过程,以晚期天然气充注为主。第1期烃类包裹体主要发蓝绿色荧光,单相烃类包裹体较多,气液两相烃类包裹体较少,共生盐水包裹体较少,未见含甲烷的富气包裹体,以原油充注为主,形成于东营组沉积期成藏阶段。第2期烃类包裹体以气液两相富气包裹体为主,其气液比相对较大,液相发蓝色荧光,为高成熟度凝析油,富气包裹体中含甲烷等气体,说明成藏的天然气为湿气,成藏期为明化镇组沉积期至今。成藏期的古压力计算表明,第1期成藏的压力系数在1.00~1.17,属于正常压力油气藏;第2期成藏的压力系数相对较高,在0.95~1.33,总体属于正常压力范围,个别井区达到异常高压范围(压力系数大于1.20)。杨税务潜山油气藏的古今压力系数变化不大,表明其封闭性较好,有利于油气保存。

关键词: 烃类包裹体, 成藏期, 杨税务潜山, 古流体压力, 渤海湾盆地

Abstract: Condensate gas reservoir in Yangshuiwu buried-hill of Langgu sag is an important exploration discovery in Bohai Bay Basin in recent years, but there is still no deep understanding of its hydrocarbon accumulation process. Through the analyses of petrography, microthermometry, Raman spectroscopy and PVT simulation of the fluid inclusions in buried-hill reservoirs, it is shown that five types of fluid inclusions are mainly developed in the reservoirs, including two-phase (vapor-liquid) aqueous inclusions, monophase all-vapor inclusions, two-phase (vapor-liquid) hydrocarbon inclusions, two-phase vapor-rich inclusions and monophase all-liquid hydrocarbon inclusions. There are two periods of oil and gas accumulation developed in Yangshuiwu buried hill area, dominated by late natural gas charging. The hydrocarbon inclusions in the first period mainly show blue-green fluorescence. Among them, there are more monophase hydrocarbon inclusions, less two-phase (vapor-liquid) hydrocarbon inclusions, less coeval aqueous inclusions, and no vapor-rich methane-bearing inclusions, indicating oil charging and accumulation in the sedimentary period of Dongying Formation. In the second period, hydrocarbon inclusions are dominated by two-phase vapor-rich inclusions. The vapor-liquid ratio is relatively large, and the liquid phase shows blue fluorescence, indicating high maturity condensate. The vapor-rich inclusions contain methane and other gases, indicating that the wet natural gas accumulated in the reservoir, and the accumulation period is from the sedimentary period of Minghuazhen Formation to the present. The calculation of paleo-fluid pressure in the accumulation period shows that the pressure coefficient in the first accumulation period is in the range of 1.00 to 1.17, indicating a normal pressure reservoir. The pressure coefficient in the second accumulation period is relatively high, ranging from 0.95 to 1.33. It is generally within the normal pressure range, but reaches to the abnormal high pressure range in several well areas (the pressure coefficient is greater than 1.20). The pressure coefficient of Yangshuiwu buried-hill oil and gas reservoir has little difference between the past and present, indicating that the reservoir has good sealing properties,which is conducive to oil and gas preservation.

Key words: hydrocarbon inclusions, accumulation period, Yangshui buried hill, paleo-fluid pressure, Bohai Bay Basin

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