岩性油气藏 ›› 2016, Vol. 28 ›› Issue (3): 58–67.doi: 10.3969/j.issn.1673-8926.2016.03.009

• 油气地质 • 上一篇    下一篇

鄂尔多斯盆地富县地区马五段白云岩储层特征与演化

李 维12,张军涛3,朱筱敏2,孙宜朴3,李淑筠3

  

  1. 1. 中国石化江苏油田分公司 勘探开发研究院,江苏 扬州 225009 ; 2. 中国石油大学(北京) 地球科学学院,北京 102249 ; 3. 中国石化石油勘探开发研究院,北京 100083
  • 出版日期:2016-05-20 发布日期:2016-05-20
  • 第一作者:李维( 1990- ),男,硕士,主要从事沉积与储层方面的研究工作。 地址:( 225009 )江苏省扬州市维扬路 188 号江苏油田勘探开发研究院。E-mail : liwei_1.jsyt@sinopec.com
  • 基金资助:

    国家重点基础研究发展计划( 973 )项目“中国早古生代海相碳酸盐岩层系大型油气田形成机理与分布规律”(编号: 2012CB214802 )和国家重大科技专项“海相碳酸盐岩层系优质储层分布与保存条件评价”(编号: 2011ZX05005-002 )及“岩性地层油气藏沉积体系、储层形成机理与分布研究”(编号: 2011ZX05001-002 )联合资助

Characteristics and evolution of the Ordovician dolomite reservoir of Ma 5 member in Fuxian area, Ordos Basin

Li Wei12, Zhang Juntao3, Zhu Xiaomin2, Sun Yipu3, Li Shujun3

  

  1. 1. Research Institute of Exploration and Development , Sinopec Jiangsu Oilfield Company , Yangzhou 225009 , Jiangsu , China ;2. College of Geosciences , China University of Petroleum , Beijing 102249 , China ; 3. Sinopec Research Institute of Petroleum Exploration and Production , Beijing 100083 , China
  • Online:2016-05-20 Published:2016-05-20

摘要:

鄂尔多斯盆地奥陶系马家沟组马五段发育一套风化壳储层。 通过岩心、岩石薄片、阴极发光、电子探针、碳与氧同位素和物性测试等实验分析并与中部气田区同类储层对比,研究了富县地区风化壳储层特征和形成演化规律,发现膏质结核溶模孔是本区最主要的储集空间,溶孔充填物多样且充填程度差异较大。 研究认为:沉积相直接影响孔隙度大小(结核溶孔大小与数量),并间接影响储层渗透性(孔间释压裂缝的发育程度);表生期成岩作用决定储层的储集性能,大气淡水的选择性溶蚀构建溶孔轮廓,古地貌低部位孔隙被方解石完全充填;埋藏期成岩改造作用有限。 明确了有利储层分布于马五段沉积期含膏云坪相和岩溶古地貌高部位叠置区域。 沉积相和古地貌的精细描述是下一步有利储层预测的关键。

关键词: 页岩气, 矿物组分, 有机碳, 储集空间, 构造保存, 龙马溪组, 大安寨段

Abstract:

There is a set of weathering crust reservoir developed in Majiagou Formation in Ordos Basin. Based on experimental analyses of cores, thin section examination, cathodoluminescence, electronic probe, carbon and oxygen isotope, and physical property, the characteristics and evolution of weathering crust reservoir in Fuxian area were studied. The result shows that gypsum and anhydrite mainly occurred as isolated nodules in Ma 5 penecontem poraneous dolomite in Fuxian area. These nodules were dissolved by meteoric water during Caledonian and experienced other diagenesis after buried, which forms the most significant reservoir spaces with diversiform filling degree and types. Sedimentary facies affects the porosity directly by controlling the size and quantity of nodules,and it could affect the reservoir permeability indirectly as the small quantity of nodules is not beneficial to the development of micro cracks among pores ( Anhydrite would dilate when absorbing water and increase formation pressure, and the pressure would decrease after the nodules were dissolved, which then generated micro cracks ) Reservoir properties are principally determined by epidiagenesis. Gypsum was dissolved by meteoric water and pores formed during that period, and the pores located in the lower part of paleo-landform generally suffered totally filling of calcite. The effect of burial diagenesis on reservoirs in the study area is fairly weaker than that on the samereservoirs in the Central Gas Field of Ordos Basin. The formation mechanism of highquality reservoirs was defined,and it is considered that favorable reservoirs are mainly located in overlapped areas between gypsum-bearingdolomite flat and paleohigh of karst geomorphology. Fine description about sedimentary facies and karst geomor-phology should be the key for the further reservoir prediction.

Key words: shale gas, mineral composition, organic carbon, reservoir space, tectonic preservation, Longmaxi Formation, Da’anzhai member

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