
第28卷第4期 2014年8月
现代地质 GEOSCIENCE
渗透回流模式白云石化作用对碳酸盐岩
储层的影响
杨冰,李佳琦,杨磊磊,许天福
(吉林大学地下水资源与环境教育部重点实验室,吉林长春130021)
Vol. 28No. 4
Aug.2014
摘要:白云石化作用对含油气的碳酸盐岩储层有明显的改造作用,而前人的研究大部分是针对白云石的成因模式,未对其形成过程给出具体描述,更未对白云石化作用对储层的改造程度做出定量分析。针对白云石化中的“渗透回流模式”,建立了白云石化作用的一维模型,利用多组分、多相流溶质运移模拟软件TOUGHREACT,研究渗透回流模式对储层物性影响的深度范围。结果表明,当高Mg/Ca比的浓缩海水进人含水层后,导致方解石溶解,白云石沉淀,储层孔隙度与渗透率均比初始值大,模拟5万年时,依靠重力作用,渗透回流白云石化作用能够影响到50m深的储层范围,产生一定规模的白云岩储层。
关键词:白云石化:渗透回流:储层物性;TOUGHREACT
中图分类号:TE122.2
文献标志码:A
文章编号:10008527(2014)04081707
AStudy of theEffect of theDolomitizationontheCarbonateReservoir
intheSeepageRefluxMode
YANG Bing, LI Jia-qi, YANG Lei-lei, XU Tian-fu
( Key Laboratory of Grounduater Resources and Eneironment, Ministry of Education, Jilin Unizersity, Changchun, Jilin130021, China)
Abstract: Dolomitization has a significant influence on the carbonate rock reservoirs which contain oil and gas resources. Previous studies mainly focus on formation models of the dolomite, however, a fair description of its formation process is quite rare, needless to say a reasonable quantitative analysis for the transformation level of the reservoir by dolomitization. In this paper, a 1 - D model was set up based on the seepage reflux dolomitiza-tion model. Under the comprehensive advantage of TOUGHREACT, a multicomponent multiphase flow and sol-ute transport simulation software, the exploration on the transformation of the reservoir by dolomitization is fully re-alized. As the obvious results illustrate : when the concentrated sea water with high Mg/Ca ratio intrudes into the aquifer, calcite dissolution and dolomite precipitation are inevitable and actually happen in this case. The porosity and permeability are greater than the initial value. In 50,o00 years, by force of gravity, seepage reflux dolomiti
zation can affect 5O m depth of the reservoir resulting in the formation of a certain scale dolomite reservoir. Key Words: dolomitization; seepage reflux; physical properties of reservoir; TOUGHREACT
0引言
资源。近年来研究表明:碳酸盐岩中的油气储量占全球油气资源总储量的50%,产量更高达60%
碳酸盐岩中常常赋存重要的油气资源和矿产以上,而碳酸盐岩储层有一半为白云岩。此外,收稿日期:2014-01-12;改回日期:2014-03-15;责任编辑:孙义梅。
基金项目:中国石油天然气股份有限公司科学研究与技术开发项目(2011A-0207):吉林大学研究生创新基金资助项目
(2014026)。
作者简介:杨冰,男,硕士研究生,1988年出生,地下水科学与工程专业,主要从事地下水多组份反应溶质运移方面的工
作。Email;yangbing12@mails. jlu. edu.cn。