西南石油大学学报(自然科学版)

Previous Articles     Next Articles

Mechanism and Process Analysis of Calcareous Precipitation in the#br# Syndepositional Stage

SHAN Jingfu1*, ZHANG Qian2, PENG Miao2, GUO Bing3, GAO Huaixi4   

  1. 1. MOE Key Laboratory of Exploration Technologies for Oil and Gas Resources,Yangtze University,Wuhan,Hubei 430100,China
    2. Xinjiang Oilfield Company,PetroChina,Karamay,Xinjiang 834000,China
    3. No 1. Production Plant,Changqing Oilfield Company,PetroChina,Xi′ an,Shaanxi 716000,China
    4. Xinglongtai Oil Production Plant,Liaohe Oilfield Company,PetroChina,Panjin,Liaoning 124010,China
  • Online:2016-08-01 Published:2016-08-01

Abstract:

The caliche in the superficial arcose in paleodepositional environments is one of the important factors affecting
reservoir physical property. In paleodepositional surface environments,the concentration of calcium is generally in the form
of plates and flakes. The paper points out the origin of the Ca2+,the conditions of the concentration of the Ca2+ and the
mechanism and dominant factors of the caliche formation through physical-chemical study. The results show that the Ca2+
is dissociated from silicon aluminate particles,which is closely connected with the existence of the atmospheric acidic water.
When the climate is dry,with the evaporation larger than precipitation,the lake surface keeps decreasing,the river diverts or
the transition flow blocked,etc.,which are all beneficial for the decomposition of the heavy calcium carbonate,thus making
the plate-like and flaky caliches widely scattered. Therefore,we hold that a clear understanding of the mechanism and dominant
factors of calcium concentration is of significance in the efficient exploitation in the late period of production.

Key words: caliches, groundwater, atmospheric acidic water, paleodepositional environments, cause

CLC Number: