大庆长垣扶余油层砂岩中方解石胶结物的碳、氧同位素特征及其成因

doi:10.11743/ogg20150210

Abstract

Abstract:

Calcite is one the most widely spreading cements in deep sandstone reservoirs in Daqing Placanticline.It has also been regarded as the main factor for facilitating the formation of tight reservoirs in oil-bearing Fuyu layer.Thin section,scanning electron microscope,X-ray diffraction,fluid inclusion and carbon/oxygen isotope analyses were carried out on calcite from cored wells penetrating the layer to identify its isotope composition and genesis.The results show that the reservoirs are mainly feldspar lithic and lithic feldspar sandstone with clay minerals represented by I/S+I+K assemblage.The cement has its δ¹³C(PDB)value ranging between -20.3‰ and -3.2‰ and the δ¹⁸O(PDB)value varying from -25.3‰ to -20.3‰ with an average value of -22.67‰.Calculation shows that the paleosalinity Z is between 73.92 and 109.89,indicating a fresh water environment with high salinity for the formation of carbonate.The temperature for the calcite to be formed is between 80 ℃ and 100 ℃ based on converted temperature of isotopes and homogenization temperature of fluid inclusions.Isotope diagrams reveal that the formation of the calcite cement is probability connected with organic acid decarboxylation,inferring an “organic carbon” origin for the carbon in the cement.

Key words: carbon and oxygen isotope, calcite cement, petrology, oil-bearing Fuyu layer, Daqing Placanticline

CLC Number:

TE122.1

Song Tushun, Ma Feng, Liu Li, Meng Qi'an, Yu Yanlong, Liu Na, Yu Miao. Features and genesis of carbon-oxygen isotopes in calcite cement from sandstone in oil-bearing Fuyu layer of Daqing Placanticline[J]. Oil & Gas Geology, 2015, 36(2): 255-261.

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Features and genesis of carbon-oxygen isotopes in calcite cement from sandstone in oil-bearing Fuyu layer of Daqing Placanticline

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