塔中地区下奥陶统鹰山组白云岩成因研究

doi:10.3969/j.issn.1673-8926.2012.01.004

Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (1): 20-25.doi: 10.3969/j.issn.1673-8926.2012.01.004

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Origin of dolomite of Lower Ordovician Yingshan Formation in Tazhong area

WANG Zhenyu¹， YANG Liuming¹， MA Feng²， YANG Liuyan²， ZANG Shiqing¹， LUO Xinsheng³

1. College of Resource and Environment， Southwest Petroleum University， Chengdu 610500， China； 2. PetroChina Research Institute of Petroleum Exploration & Development， Beijing 100083， China； 3. Research Institute of Exploration and Development， PetroChina Tarim Oilfield Company， Korla 841000， China

Online:2012-02-20 Published:2012-02-20

Abstract

Abstract:

Yingshan Formation of Lower Ordovician in Tazhong area of Tarim Basin becomes an important object for marine carbonate rocks exploration, and it developed large amounts of qualified dolomite reservoirs. Due to the deep burial and low degree of exploration of dolomite, the cognition of its origin is not perfect. The well drilling data from 8 wells were applied to analyze the petrology and geochemistry characteristics of the dolomite of Yanshan Formation. The result shows that there developed 5 types of dolomites; the C and O isotope is generally negative and Sr isotope is positive. Combined with trace elements, cathodoluminescence and other geochemistry characteristics, it was considered that there are three origin mechanisms, including deep burial origin, hydrothermal origin and near surface evaporation seawater origin.

Key words: natural gas, production, reserve-production ratio, recovery percentage, reserves displacement rate

WANG Zhenyu，YANG Liuming，MA Feng，YANG Liuyan，ZANG Shiqing，LUO Xinsheng. Origin of dolomite of Lower Ordovician Yingshan Formation in Tazhong area[J].Lithologic Reservoirs, 2012, 24(1): 20-25.

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