摘要
对大港滩海地区沙一段下部砂岩储层中方解石胶结物的12个样品进行了碳、氧同位素分析,结果表明碳同位素δ13C值分布 范围在-9.58‰～+13.61‰,平均为5.29‰;氧同位素δ18O值分布范围在-12.46‰～+0.09‰,平均为-6.28‰。探讨了碳酸 盐岩的成岩流体盐度及碳的来源和成因等问题,认为本区的方解石胶结物成岩流体为高盐度流体,方解石胶结物主要来自层内碎屑 碳酸盐颗粒或者邻近碳酸盐岩层的溶解,其碳来源主要为还原有机碳。
Composition of carbon and oxygen isotopes of calcite cement from 12 samples in sandstone reservoirs of the Lower Part of Number 1 of Shahejie Formation, Dagang beach area, are analyzed. The δ^(13)C va-lue of calcite cement varies from -9.58‰ to +3.61‰, and the average is 5.29‰; the δ^(18)O value varies from -12.46‰ to +0.09‰, and the average is -6.28‰. Discussion of diagenetic fluid salinity, carbon source and formation cause suggest that, diagenetic fluid salinity of calcite cement in this area is high, and the calcite cement comes from intrastratal clastic carbonate or dissolution of calcite from adjacent layers. Carbon mainly originates from organic carbon.
出处
《石油实验地质》
CAS
CSCD
2004年第6期590-593,共4页
Petroleum Geology & Experiment
关键词
碳、氧同位素
成岩流体盐度
碳来源
方解石胶结物
沙一下亚段
大港滩海
C/O isotope
diagenetic fluid salinity
carbon source
calcite cement
the Lower Part of Number 1 of Shahejie Formation
the Dagang beach area
