石油学报 ›› 2012, Vol. 33 ›› Issue (S2): 74-81.DOI: 10.7623/syxb2012S2007

• 地质勘探 • 上一篇    下一篇

四川盆地东北部飞仙关组储层流体包裹体特征

夏茂龙 1,2  范 毅 1  江蓉蓉 2,3  张 婷 4  洪海涛 1  王一刚 1  刘 鑫 1,2  陈 文 1   

  1. 1.中国石油西南油气田公司勘探开发研究院 四川成都 610041; 2.成都理工大学能源学院 四川成都 610059;3.中国石化西南油气公司勘探开发研究院 四川成都 610081; 4.南京大学地球科学系 江苏南京 210093
  • 收稿日期:2012-07-02 修回日期:2012-10-12 出版日期:2012-12-25 发布日期:2013-03-01
  • 通讯作者: 夏茂龙
  • 作者简介:夏茂龙,男,1982年12月生,2005年获西北大学地质学系学士学位,现为中国石油西南油气田公司勘探开发研究院工程师、成都理工大学硕士研究生,主要从事石油、天然气地质与地球化学研究工作。
  • 基金资助:

    国家重大科技专项(2011ZX05004-005与2011ZX05007-003)及中国石油天然气股份有限公司重大科技专项(2008E-0705)资助。

The characteristics of fluid inclusions in Feixianguan Formation, northeastern Sichuan Basin, China

XIA Maolong 1, 2  FAN Yi 1  JIANG Rongrong 2, 3 ZHANG Ting 4  HONG Haitao 1  WANG Yigang 1  LIU Xin 1, 2  CHEN Wen 1   

  • Received:2012-07-02 Revised:2012-10-12 Online:2012-12-25 Published:2013-03-01

摘要:

四川盆地东北部下三叠统飞仙关组鲕滩气藏储层成岩矿物中的流体包裹体主要有盐水溶液包裹体、含烃包裹体和烃类包裹体3大类。拉曼光谱成分测试表明,气相烃类包裹体以含CH4为主,平均含量为82.94%;H2S平均含量为7.29%,但H2S含量变化较大,为2.17%~13.08%,包裹体中的H2S平均含量较现今气藏低一些,且变化范围更大,为气藏不同演化阶段所捕获。含烃气液两相包裹体中H2O、CH4和H2S的含量变化都比较大,为盐水溶液和天然气在不混溶条件下捕获。高含H2S的含烃包裹体和气态烃包裹体基本不含CO2,这一现象与TSR反应产生CO2和H2S,CO2参与储层溶蚀作用而被大量消耗有关。CO2参与储层溶蚀作用,碳酸盐沉淀作用加强,白云石、方解石在孔隙及裂缝中结晶沉淀,并捕获以含CH4和H2S为主、不含或微含CO2的包裹体,因此川东北飞仙关组气藏具有CO2含量相对H2S显著亏损的特征。

关键词: 飞仙关组, 流体包裹体, 均一温度, 拉曼光谱, TSR反应, 储层溶蚀作用, 四川盆地

Abstract:

The fluid inclusions that occurred in diagenetic minerals of oolitic beach gas reservoirs in the Lower Triassic Feixianguan Formation in northeastern Sichuan mainly included saline aqueous inclusions, hydrocarbonaceous inclusions, and hydrocarbon inclusions. Raman spectra showed that the gas hydrocarbon inclusions were mainly comprised of CH4, accounting for 82.94% on average. The average content of H2S was 7.29%, ranging from 2.17% to 13.08%. The average content of H2S in fluid inclusions was lower than that in the present gas reservoirs, varying in a larger range and captured by gas reservoirs in different evolutionary stages. In the hydrocarbonaceous two-phase gas-liquid inclusions, the contents of H2O, CH4 and H2S substantially varied and were captured by saline aqueous solution and natural gas under immiscible conditions. The hydrocarbonaceous inclusions and gas hydrocarbon inclusions with abundant H2S generally lacked CO2. The low content of CO2 was closely related to the production of CO2 and H2S in the thermochemical sulfate reduction(TSR) and substantial CO2 consumption in the reservoir dissolution. Due to the involvement of CO2 in reservoir dissolution and enhancement of carbonate precipitation, dolomite and calcite crystals precipitated in pores and cracks, further capturing fluid inclusions with high contents of CH4 and H2S and low content or lack of CO2. Therefore, the gas reservoirs of Feixianguan Formation in northeastern Sichuan were characterized with significant CO2 losses relative to the H2S content.

Key words: Feixianguan Formation, fluid inclusions, homogenization temperature, Raman spectroscopy, thermochemical sulfate reduction(TSR), reservoir dissolution, Sichuan Basin