西南石油大学学报(自然科学版) ›› 2011, Vol. 33 ›› Issue (3): 18-26.

• 地质勘探 • 上一篇    下一篇

靖边气田东侧马五1-2 储层成岩作用及孔隙演化

何刚1,2 卢涛3 雷卞军4 兰义飞3
  

  1. 1. 中国科学院地质与地球物理研究所,北京东城100029
    2. 中国石油天然气股份有限公司勘探与生产公司,北京东城100011;
    3. 中国石油长庆油田分公司勘探开发研究院,陕西西安710018
    4. 西南石油大学资源与环境学院,四川成都610500
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2011-06-20 发布日期:2011-06-20

Diagenesis and Porosity Evolution of the Reservoir of Ma51-2 Submember of Eastern Jingbian Gas Field

HE Gang 1,2 LU Tao 3 LEI Bian-jun 4 LAN Yi-fei 3
  

  1. 1. Institute of Geology and Geophysics,Chinese Academy of Sciences Dongcheng, Beijing 100029, China
    2. Exploration and Production Company,CNPC,Dongcheng Beijing, 100029, China
    3. Exploration and Development Research Institute of Changqing
    Oil Field Company,CNPC,Xi‘an, Shaanxi 710018, China
    4. School of Resources and Environment,Southwest Petroleum University,Chengdu, Sichuan 610500, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-06-20 Published:2011-06-20

摘要:

鄂尔多斯盆地马五1-2 亚段为陆表海蒸发碳酸盐潮坪相,靖边气田储层主要由含溶孔白云岩和细晶白云岩构成。有利于形成储层的岩相是潮上带(含)石膏结核泥晶—细粉晶白云岩和潮间带上部含石膏晶模泥晶—细粉晶白云岩。准同生期白云石化和石膏化作用奠定了储层的物质基础;表生岩溶期淡水选择性地溶解白云岩中石膏结核和晶体建立了储层的轮廓;溶孔中各种矿物(渗流粉砂白云石、自生石英、亮晶方解石、亮晶白云石和高岭石等)的充填作用和埋藏期溶解作用,决定了早期溶孔能否保存和储层的最终状况。将马五31小层划分为3 类共8 个成岩作用区。储层变化总体趋势是,从西往东马五31小层沉积微相有利条件逐渐变差(即沉积期白云岩中(硬)石膏含量逐渐减少),溶孔充填程度增高,孔隙发育程度变差;从北到南不同区块储层发育情况差别较大。

关键词:

靖边气田, 马家沟组, 白云岩, 成岩作用, 孔隙演化

Abstract:

Ma51-2 submember of Jingbian Gas Field in Ordos Basin belongs to evaporated carbonate tidal flat facies.
The reservoir of Jingbian Gas Field mainly constituts dolomite with dissolved pore and a little fine-crystal dolostone. The microfacies that are favorable for developing reservoirs are supratidal zone dolomite with anhydrite
nodule and upper part intertidal zone dolomite which have anhydrite crystal. Ma51-2 submember had undergone complex diageneses. Penecontemporaneous dolomitization and gypsification laid a material base for reservoirs. Epidiagenesis selective dissolution of anhydrite nodule and crystal in dolomite constructs the ambit of reservoirs. The sort and amount of mineral filling in dissolved pore(vadose silt dolomite,self-generation quartz,calcsparite calcite,dolomite cement,kaolinite etc.)and burial dissolution that determine the preservation condition of dissolved pore and the feature of reservoirs. The Ma 3 sublayer in eastern Jingbian Gas Field are divided into 3 categories,8 diagenesis blocks. Within region of interest,from west to east,the conditions of the sedimentary facies of Ma513 sublayer are gradually weakening(in other words:content of gypsum in dolomstone gradually decrease). When the filled degree of dissolved pore gradually increases,the voidage of the reservoir gradually deteriorates. On the other hand,from north to south,the degree of reservoirs developped in different blocks are obviously variational.

Key words:

Jingbian Gas Field, Majiagou Formation, dolomite, diagenesis, porosity evolution

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