Character Study and Analysis of Dolomite of Mesozoic in Qingzang Plateau

WANG Xing tao; ZHANG Qing shi; ZHANG Ji; ZHOU Shu xin; LI Jing wei

After dolomites of Qiangtang Basin and Cuoqin Basin in Qingzang Plateau are observed and described in the field, vertical and horizontal distribution rules of dolomite in the study area are reduced. Applying structure index, cathode shining index and oxygen isotope index, genesis of dolomite are effectively judged by use of systematically indoor analysis and laboratory test method. Then it is concluded that dolomites of the study area are all produced by metasomatism or dolomitation, not originally. According to size and shape of crystals and inner structure of dolomites, dolomiting phase are divided into three phases: quasi-contemporaneous phase, diagenesis and catagenesis. Features of each phase are introduced. It is found that dolomites formed in diagenesis can be a good reservoir rock.Through selecting typical sections, two kinds of genetic models of dolomite in the study area are put forward, i.e. capillary concentration model and mixed water model.

1. Daqing Petroleum Institute, Anda Heilongjiang 151400

Received Date: 1999-08-31

Rev Recd Date: 1999-12-27

Publish Date: 2000-08-10

Key words:

Abstract: After dolomites of Qiangtang Basin and Cuoqin Basin in Qingzang Plateau are observed and described in the field, vertical and horizontal distribution rules of dolomite in the study area are reduced. Applying structure index, cathode shining index and oxygen isotope index, genesis of dolomite are effectively judged by use of systematically indoor analysis and laboratory test method. Then it is concluded that dolomites of the study area are all produced by metasomatism or dolomitation, not originally. According to size and shape of crystals and inner structure of dolomites, dolomiting phase are divided into three phases: quasi-contemporaneous phase, diagenesis and catagenesis. Features of each phase are introduced. It is found that dolomites formed in diagenesis can be a good reservoir rock.Through selecting typical sections, two kinds of genetic models of dolomite in the study area are put forward, i.e. capillary concentration model and mixed water model.

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Reference (8)

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Character Study and Analysis of Dolomite of Mesozoic in Qingzang Plateau

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