天然气地球科学

• 天然气地质学 • 上一篇    下一篇

裂缝对致密砂岩气成藏富集与高产的控制作用 — 以库车前陆盆地东部侏罗系迪北气藏为例

芦慧,鲁雪松,范俊佳,王喜捍,付晓飞,魏红兴,张宝收   

  1. 1.东北石油大学地球科学学院,黑龙江 大庆 163318;
    2.中国石油天然气集团公司盆地构造与油气成藏重点实验室,北京 100083;
    3.中国石油勘探开发研究院,北京 100083;
    4.中国石油大港油田滩海开发公司,天津 300280;
    5.中国石油塔里木油田勘探开发研究院,新疆 库尔勒 841000
  • 收稿日期:2014-09-30 修回日期:2014-12-31 出版日期:2015-06-10 发布日期:2015-06-10
  • 通讯作者: 鲁雪松(1982-),男,安徽安庆人,工程师,博士,主要从事油气成藏综合分析及油气资源评价研究. E-mail:luxs@petrochina.com.cn.
  • 作者简介:芦慧(1989-),女,新疆昌吉人,硕士研究生,主要从事油气成藏和油气资源评价研究. E-mail:duguyunjian@sina.com.
  • 基金资助:

    国家科技重大专项“前陆盆地油气成藏规律、关键技术及目标评价”(编号:2011ZX05003);中国石油天然气股份有限公司科学研究与技术开发项目“前陆盆地油气成藏规律研究与关键技术攻关”( 编号:2011B-04)联合资助 )

The Controlling Effects of Fractures on Gas Accumulation and Production in Tight Sandstone:  A Case of Jurassic Dibei Gas Reservoir in the East Kuqa Foreland Basin

LU Hui,LU Xue-song,FAN Jun-jia,WANG Xi-han,FU Xiao-fei,WEI Hong-xing,ZHANG Bao-shou   

  1. 1.College of Geosciences,Northeast Petroleum University,Daqing 163318,China;2.Key Laboratory of Basin Structure and
    Hydrocarbon Accumulation,CNPC,Beijing 100083,China;3.Research Institute of Petroleum Exploration and Development,
    PetroChina,Beijing 100083,China;4.Shallowwater Development Company of Dagang Oilfield,Tianjin 300280,China;
    5.Research Institute of Petroleum Exploration& Development,PetroChina Tarim Oilfield Company,Korla 841000,China
  • Received:2014-09-30 Revised:2014-12-31 Online:2015-06-10 Published:2015-06-10

摘要:

以库车前陆盆地东部侏罗系迪北致密砂岩气藏为例,探讨了裂缝对致密砂岩储层储集空间、渗流能力的影响机理,以及裂缝对致密砂岩气成藏富集与高产的控制作用。根据激光共聚焦显微镜观测统计,该区显微构造裂缝宽度半径主要分布在8~25μm之间,伴生微裂缝宽度半径主要分布在4~10μm之间,而喉道半径主要分布在1~4μm之间,裂缝宽度要大于喉道半径,作为主要渗流通道。饱和水岩心天然气充注物理模拟实验、压汞实验和气水两相渗透率实验表明,同等孔隙度条件下,裂缝发育的储层样品天然气更容易注入,排驱压力降低,进汞饱和度增加,气相渗透率增大。结果表明:裂缝对致密储层物性的改善起到关健作用,裂缝沟通孤立的孔隙形成连通的储集空间,沿裂缝易发育溶蚀形成新的孔隙,裂缝自身也可作为储集空间;裂缝提高了致密储层的渗流能力,降低了天然气运移所需的启动压力梯度,提高了天然气有效渗透率,使天然气充注效率增加,也有利于天然气的产出;裂缝发育的时间和空间位置不同,对致密砂岩气藏成藏富集及高产的控制作用也不同。

关键词: 裂缝, 致密砂岩气, 渗流, 启动压力, 相对渗透率, 成藏富集, 迪北气藏

Abstract:

Taking Dibei tight sandstone gas reservoir in the east Kuqa Foreland Basin as an example,this paper provides a detailed discussion of how fractures to affect the storage space and gas flow capacity,and thus how to control gas accumulation,enrichment and prolific production in tight sandstone reservoir.According to the statistics of laser confocal fluorescent microscopy observation,the micro-structural fracture width in Dibei gas reservoir is mainly in 8-25μm and the associated micro-fractures width is mainly in 4-10μm,while throat radius are mainly in 1-4μm.The fractures width is much wider than throat radius and serves as a main channel of gas flowing.Based on physical simulation experiment of gas charging into core samples with saturated water,mercury injection and gas-water two-phase permeability experiment,it illustrated that the fractures developed samples are easier for gas to flow under equal porosity condition,because of the lower expulsion pressure,higher mercury injection saturation and increased gas relative permeability.Based on these analyses,it had been deduced that the fractures control tight gas in many aspects:(1)Fractures play a significant role in reservoir property improvement.The isolated pores are linked by fractures to form connective reservoir spaces,and the solutions are prior to occur along the fractures forming new pores,and the fractures mostly with width bigger than the throat radius can provide reservoir space themselves.(2)Fractures can increase fluid flow capacity because fractures will decrease the starting pressure gradient,increase gas effective permeability and thus improve gas injection efficiency as well as gas production.(3)The fractures developed in different time and spatial places have different effects on gas accumulation,enrichment and production in tight sandstone reservoirs.

Key words: Fracture, Tight sandstone gas, Fluid flow, Starting pressure, Relative permeability, Gas accumulation and enrichment, Dibei gas reservoir

中图分类号: 

  • TE122.3

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