石油实验地质2012，Vol.34Issue(2)：134-139,6.
柴达木盆地北缘马北地区碳酸盐胶结物特征及意义
Characteristics and significances of carbonate cements in northern Mahai region, northern margin of Qaidam Basin
摘要
Abstract
Based on lithology, mineralogy and geochemistry, the generation environment and source for carbonate cements in sandstone reservoirs in the lower position of the Paleogene Lower Ganchaigou Formation in the north of the Mahai Uplift which located in the northern margin of the Qaidam Basin were studied systematically. Two types of calcite cements were found, including xenomorphic micrite and hypidiotopic microcrystalline. Their carbon isotope values (δ13C) ranged from -7. L‰ to -3. 3‰ with the average of -4. 9‰, and the oxygen isotope values (δI8O) ranged from -11. 3‰ to -9. 6‰ with the average of -10.3‰. The Z-values of paleosalinity ranged from 107. 0 to 115.6 and the average value was 112. 1. The generation of carbonate cements in sandstone reservoirs in the study area might be related to the decarboxylation of organic matters during the early diagenetic stage. A little organic carbon also participated in the reaction. Diagenetic fluids mainly came from clast and atmospheric freshwater.关键词
氧同位素/碳同位素/碳酸盐胶结物/下干柴沟组/马海凸起/柴达木盆地Key words
carbon isotope/ oxygen isotope/ carbonate cement/ Lower Ganchaigou Formation/ Mahai Uplift/ Qaidam Basin分类
能源科技引用本文复制引用
孙国强,马进业,王海峰,陈吉,张永庶,贾艳艳,张生银,史基安..柴达木盆地北缘马北地区碳酸盐胶结物特征及意义[J].石油实验地质,2012,34(2):134-139,6.基金项目
国家重点基础研究发展计划(973计划)项目(2011CB201104)和中国科学院油气资源研究重点实验室开放基金(KFJJ2012-05)资助. （973计划）
