Cambrian Sedimentary Characteristics and Origin of High-Quality Dolomite Reservoirs in Eastern Tarim Basin
Received date: 2007-11-14
Revised date: 2008-01-14
Online published: 2008-02-10
The discovered Cambrian dolomites in Milan well 1 and Yingdong well 2 are important reservoir rocks in the carbonates of the Lower Paleozoic, Eastern Tarim basin. The high-quality dolomite reservoir rocks mainly occurred in carbonate shallow ramp deposits. Geochemical analyses of carbon and oxygen isotopes, ordering determination and inclusions suggest that the dolomites may be divided into two types: the first is the high temperature hydrothermal fluid dolomitization, the second is the seepage reflux dolomitization. The high temperature hydrothermal fluid dolomitization is crucial to the formation of high-quality dolomite reservoir rocks. The formation of high-quality dolomite reservoir rocks is the result of the seepage reflux dolomitization being overprinted by the high temperature hydrothermal fluid dolomitization in the region.
Key words： Eastern Tarim basin; Cambrian; Dolostones; Sedimentary characteristic; Genesis.
LIU Yong-fu ;YIN Jun ;SUN Xiong-wei ;JIN Ying-ai ;KADEER Tuo-hu-ti ;DANG Qing-ning . Cambrian Sedimentary Characteristics and Origin of High-Quality Dolomite Reservoirs in Eastern Tarim Basin[J]. Natural Gas Geoscience, 2008 , 19(1) : 126 -132 . DOI: 10.11764/j.issn.1672-1926.2008.01.126
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