石油学报 ›› 2011, Vol. 32 ›› Issue (6): 968-975.DOI: 10.7623/syxb201106006

• 地质勘探 • 上一篇    下一篇

松辽盆地北部深层火山岩气藏的充注:来自流体包裹体的证据

肖  骏 1,2  陈汉林 1  杨树锋 1  章凤奇 1  林秀斌 1  余  星 3  庞彦明 4  舒  萍 4   

  1. 1浙江大学地球科学系  浙江杭州  310027; 2中国地质大学期刊社  湖北武汉  430074; 3国家海洋局第二海洋研究所  浙江杭州  310012; 4大庆油田有限责任公司勘探开发研究院  黑龙江大庆  163712
  • 收稿日期:2011-05-07 修回日期:2011-08-26 出版日期:2011-11-25 发布日期:2012-01-17
  • 通讯作者: 肖 骏
  • 作者简介:肖 骏,女,1983年2月生,2011年获浙江大学理学博士学位,现为中国地质大学(武汉)期刊社编辑。
  • 基金资助:

    中国博士后科学基金面上项目(20070421162)资助。

Gas charging of deep volcanic reservoirs in the northern Songliao Basin:Evidence from fluid inclusions

XIAO Jun 1,2  CHEN Hanlin 1  YANG Shufeng 1  ZHANG Fengqi 1  LIN Xiubin 1  YU Xing 3  PANG Yanming 4  SHU Ping 4   

  • Received:2011-05-07 Revised:2011-08-26 Online:2011-11-25 Published:2012-01-17

摘要:

厘清松辽盆地北部徐家围子断陷营城组火山岩气藏天然气的来源和充注特征对天然气的勘探开发具有重要意义。系统研究了营城组储层中次生流体包裹体的成分和均一温度,旨在揭示天然气气藏的来源和充注特征。研究结果表明该储层中发育了富CH4和富CO2两类流体包裹体。富CH4流体包裹体均一温度出现频率最高的区间包括:160~163℃、185.2~225℃和233~243.4℃,说明存在3期含烃流体;富CO2流体包裹体均一温度为235.2~269.1℃,为一期充注。均一温度高于烃源岩沙河子组地层的最高埋深温度(230℃)的富CO2流体包裹体和高温富CH4流体包裹体内的天然气可能来源于深部。流体包裹体主要成分和气藏天然气主要成分对比表明,本区天然气充注存在3种充注方式:①一期天然气充注形成;②多期混合充注形成;③前期充注被后期天然气充注取代形成。

关键词: 松辽盆地, 流体包裹体, 火山岩气藏, 充注方式, 幔源成因

Abstract:

Gas sources and charging models of volcanic reservoirs are of significance in gas exploration and development, the present paper examined CH4- and CO2-rich fluid inclusions discovered in the Yingcheng Formation of the Xujiaweizi fault depression, northern Songliao Basin to delineate source and charging characteristics of gas reservoirs. The result indicates that homogenization temperatures of CH4-rich fluid inclusions in various samples range from 160℃ to 243.4℃ with three most frequent intervals between 160~163℃, 185.2~225℃ and 233~243.4℃, suggesting three episodes of hydrocarbon fluid charging, while those of CO2-rich fluid inclusions vary from 235.2℃ to 269.1℃, indicating only one episode of CO2-rich fluid charging. Therefore, CH4- and CO2-rich fluid inclusions that have homogenization temperatures higher than 230℃, the highest burial temperature of Shahezi Formation source rocks, is most likely derived from deeper sources. The comparison of main components between fluid inclusions and natural gases in reservoirs indicated that three charging modes might occur in this area: (1) single episode gas charging; (2) multi-episode gas charging; and (3) replacement gas charging of the former by the latter.

Key words: Songliao Basin, fluid inclusion, volcanic gas reservoir, charging mode, mantle origin