石油与天然气地质 ›› 2004, Vol. 25 ›› Issue (3): 274-278.doi: 10.11743/ogg20040307

• 油气地质 • 上一篇    下一篇

川东北天然气成藏特征

徐言岗1,2, 贺自爱2, 曾凡刚3   

  1. 1. 成都理工大学,四川成都 610059;
    2. 中国石化石油勘探开发研究院新区勘探研究所,湖北荆州 434100;
    3. 中国人民大学环境学院,北京 100872
  • 收稿日期:2004-02-26 出版日期:2004-06-25 发布日期:2012-01-16
  • 基金资助:

    中国石化科技项目(YTB-2003-11)

Characteristics of gas accumulation in northeastern Sichuan basin

Xu Yangang1,2, He Ziai2, Zeng Fangang3   

  1. 1. Chengdu University of Technology, Chengdu, Sichuan;
    2. Jingzhou Institute of Frontier Petroleum Exploration, Exploration & Production Research Institute, SINOPEC, Jingzhou, Hubei;
    3. College of Environment, Renmin University of China, Beijing
  • Received:2004-02-26 Online:2004-06-25 Published:2012-01-16

摘要:

川东北天然气藏分布于早寒武世—志留纪(∈1—S)、早二叠世—早三叠世(P1—T1)及晚三叠世—中侏罗世(T3—J2)等3个异常超压系统内,具有多层叠置的特点。成藏规模取决于超压条件下水溶相天然气的脱溶程度,以埋深4500m为界,界线之上产气,界线之下产水,且产气量随地层抬升幅度增大而增大。川东北天然气藏的形成与保存由燕山期的埋深、喜山期的抬升及异常压力系统的保持情况三者共同决定,压力封闭为成藏的关键因素。因此,川东北天然气藏勘探应着眼于异常压力系统此一整体,立足于叠置多层勘探。

关键词: 天然气藏, 超压系统, 水溶气, 压力封闭, 川东北

Abstract:

Gas reservoirs in northeastern Sichuan basin are distributed in three overpressured systems,i.e.Lower Cambrian-Silurian(∈1-S),Lower Permian-Lower Triassic(P1-T1)and Upper Triassic-Middle Jurassic(T3-J2),and are characterized by multilayer superimposition.The scale of gas accumulations depends on degasification of water-soluble gas under overpressured condition.A burial depth of 4500m can be taken as boundary,under which water is produced,while above which gas is produced,and gas output increases along with the increase of uplifting.Formation and preservation of gas accumulations in northeastern Sichuan basin are determined by burial depth in Yanshan period,elevation in Himalayan period and preservation of abnormal pressure system.Pressure sealing is the key factor to gas accumulation.Therefore,gas exploration in this area should be based on prospecting the superimposed multilayers,and aiming at the overall abnormal pressure system.

Key words: gas accumulation, overpressured system, water-soluble gas, pressure seal, northeastern Sichuan basin

中图分类号: