Sedimentary Character istics of the CretaceousDesert Fac ies in Ordos Basin and The ir Hydrogeological Sign if icance

XIE Yuan; WANG Jian; JIANG Xin-sheng; LI Ming-hui; XIE ZHENG-wen; LUO Jian-ning; HOU Guang-cai; LIU Fang; WANG Yong-he; ZHANG Mao-sheng; ZHU Hua; WANG De-qian; SUN Yong-ming; CAO Jian-ke

During Cretaceous, Ordos Basin had gone two desert sedimentation evolution stages involved from Yijun- Luohe stage to Huanhe stage and from Luohandong stage to J ingchuan stage, controlled by areolation and hydro dyna- mism, under the climate evolution and tectonic lifting and subsidence. Luohe stage and Luohandong stage are two ma- jor sedimentation stages of desert facies, desert facies can be divided five sub-facies such as gobis, wades, dunes, inter-dunes, and desert lakes. Among them, sandstones of dunes are the most important desert sediments of Cretaceous; they have many pores, big thickness, stable distribution, lower salt content, and good capability of water-bearing, water-leading, water penetrating. So, dunes sediments not only have good groundwater occurrence-circulation condi- tions, but also bear groundwater of better quality.

1. Chengdu Institute of Geology and Mineral Resources,Chengdu610082;

2. Changqing Bureau of Petroleum Exploration,Xi'an710059;

3. Xi'an Institute of Geology and Mineral Resources,Xi'an710054;

4. Shaanxi Institute of Geological Survey,Xi'an710060;

5. Land and Resources Department of Shaanxi Province,Xi'an710060;

6. Ningxia Institute of Geological Survey,Yinchuan750000

Received Date: 2004-02-25

Rev Recd Date: 2004-06-29

Publish Date: 2005-03-10

Key words:

Ordos basin, Cretaceous, sedimentary Features, distribution and evolution of desert facies /
groundwater occurrence conditions /
groundwater circulation conditions /
groundwater quality /
/

Abstract: During Cretaceous, Ordos Basin had gone two desert sedimentation evolution stages involved from Yijun- Luohe stage to Huanhe stage and from Luohandong stage to J ingchuan stage, controlled by areolation and hydro dyna- mism, under the climate evolution and tectonic lifting and subsidence. Luohe stage and Luohandong stage are two ma- jor sedimentation stages of desert facies, desert facies can be divided five sub-facies such as gobis, wades, dunes, inter-dunes, and desert lakes. Among them, sandstones of dunes are the most important desert sediments of Cretaceous; they have many pores, big thickness, stable distribution, lower salt content, and good capability of water-bearing, water-leading, water penetrating. So, dunes sediments not only have good groundwater occurrence-circulation condi- tions, but also bear groundwater of better quality.

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Reference (1)

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Sedimentary Character istics of the CretaceousDesert Fac ies in Ordos Basin and The ir Hydrogeological Sign if icance

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