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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2014  >  36(5): 650-655
Huang Chenggang, Yuan Jianying, Cao Zhenglin, Zhang Shiming, Wang Ying, She Min, Mi Haijie. Simulation experiment for ankerite dissolution in clastic reservoir of saline lacustrine basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2014, 36(5): 650-655. doi: 10.11781/sysydz201405650
Citation: Huang Chenggang, Yuan Jianying, Cao Zhenglin, Zhang Shiming, Wang Ying, She Min, Mi Haijie. Simulation experiment for ankerite dissolution in clastic reservoir of saline lacustrine basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2014, 36(5): 650-655. doi: 10.11781/sysydz201405650
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Simulation experiment for ankerite dissolution in clastic reservoir of saline lacustrine basin

doi: 10.11781/sysydz201405650
  • 1.

    Key Laboratory of Reservoir Description (NWGI), Research Institute of Petroleum Exploration and Development-Northwest, PetroChina, Lanzhou, Gansu 730020, China

  • 2. Key Lab of Carbonate Reservoir, Hangzhou Research Institute of Geology, PetroChina, Hangzhou, Zhejiang 310023, China

  • 3. No.2 Geology and Mineral Exploration Institute, Bureau of Geology and Mineral Exploration and Development of Gansu Province, Lanzhou, Gansu 730020, China

  • Received Date: 2013-08-10
  • Rev Recd Date: 2014-07-03
  • Publish Date: 2014-09-28
    Abstract
  • It is generally believed that carbonate minerals can easily dissolve. This process will lead to the formation of secondary pores, thereby enlarging the reservoir space and improving the permeability of reservoir rocks. In the Qaidam Basin, clastic reservoirs of the Lower Eocene Gancaigou Formation are deposits of saline lacustrine basin, with plaster and ankerite well developed in rock flacks as revealed by polarized light microscopy and scanning electron microscope. Experimental results of fluid-rock dynamic stimulation show that the ankerite dissolution can generate secondary pores, and gypsum catalyzes the dissolution. The iron and magnesium ions generated are reactants in the transformation from koalinite to chlorite. The foliated chlorite easily blocks thin throat, leading to the decrease of permeability, while the dissolution of easily soluble minerals like ankerite increases porosity.

     

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