川南地区灯影组白云岩地球化学特征及流体来源

doi:10.11743/ogg20160512

Abstract

Abstract: Dolomite of the Dengying Formation in southern Sichuan Basin has been studied a lot as an important kind of reservoir rocks for oil and gas.However,origin of the dolomite is still in controversy.This paper studied the geochemical characteristics and fluid origin of the dolomite in the Dengying Formation in southern Sichuan Basin through analyses of C-O isotopes and trace elements.The results show that the main types of dolomites are micritic dolomite,fine-medium dolomite and breccia-dolomite.The δ¹³C and δ¹⁸O values are 0.52‰~2.06‰ (PDB) and -11.9‰~-2.14‰ (PDB),respectively,which are lower than the original values of δ¹³C (4.43‰) and δ¹⁸O (-0.62‰) of carbonates of the same period.The dolomite has high U/Th ratio,low Sr and high Eu anomalies.It is believed that the dolomite formed in a burial diagenetic environment and was altered by hydrothermal fluid later.REE distribution patterns of the dolomite is similar to the dolomite originated from seawater.Salinity indexes(Z)of the dolomite is higher than those of normal seawater.Therefore,it can be inferred that the dolomitization fluids mainly originate from the condensed seawater trapped in the Formation.

Key words: fluid origin, geochemical characteristics, dolomite, Dengying Formation, Sichuan Basin

CLC Number:

TE135

Wu Tie, Xie Shuyun, Zhang Dianwei, Li Pengtao, Bao Zhengyu, He Zhiliang, Qian Yixiong, Jiao Cunli. Geochemical characteristics and fluid origin of the Dengying Formation dolomites in southern Sichuan Basin[J]. Oil & Gas Geology, 2016, 37(5): 721-730.

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Geochemical characteristics and fluid origin of the Dengying Formation dolomites in southern Sichuan Basin

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