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大港滩海地区沙一段下部砂岩储层中方解石胶结物碳、氧同位素研究
石油实验地质
2004年 26卷 第6期
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Title
CARBON AND OXYGEN ISOTOPES OF CALCITE CEMENT IN THE LOWER PART OF THE SHA-1 FORMATION, THE DAGANG BEACH AREA
Authors
DONG Fu-xiang
LIU Li
MA Yan-ping
单位
长春工程学院, 国土资源系, 吉林, 长春, 130021
2. 吉林大学, 地球科学学院, 吉林, 长春, 130061
Organization
Land and Resources Department, Changchun Institute of Technology, Changchun, Jilin 130021, China
2. Scool of Earth Sciences, Jilin University, Changchun, Jilin 130061, China
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.
Abstract
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 δ13C va-lue of calcite cement varies from -9.58‰ to +3.61‰, and the average is 5.29‰; the δ18O 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.
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;
Keywords:
CO isotope;
diagenetic fluid salinity;
carbon source;
calcite cement;
the Lower Part of Number 1 of Shahejie Formation;
the Dagang beach area;
DOI
https://doi.org/10.11781/sysydz200406590
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