石油实验地质2012，Vol.34Issue(3)：309-313,5.
渤海湾盆地黄骅坳陷齐家务地区沙一下亚段湖相碳酸盐岩储层地球化学特征
Geochemical characteristics of lacustrine carbonate rocks in lower part of first member of Shahejie Formation in Qijiawu area of Huanghua Depression, Bohai Bay Basin
摘要
Abstract
Carbonate reservoirs dominate in the lower part of the first member of the Shahejie Formation in Qijiawu area of the Huanghua Depression, the Bohai Bay Basin. Through analyzing the chemical composition of rock, carbon and oxygen isotope and trace element of the core samples from over 10 wells, the results show that the contents of SiO2, A12O3 and CaO are relatively higher, while that of MgO varies with the differences of lithology. Meanwhile, SiO2 is positively correlated with A12O3 and K2O + Na2O. SiO2 is negatively associated with MgO. The enrichment of SiO2 shows that the sedimentary environment in the study area is lake carbonate facies. Carbon and oxygen isotope tests show that δ18OPDB, varies from -4.73‰ to -9.46‰ and δ13CPDB varies from -0.08‰ to 7.71‰, which is in line with the carbon and oxygen isotope characteristics of limited lake, reflecting the salinization and dilution effects happened in the study area. Trace tests show that the composition and content of trace element are so complex, that is to say, the content of Sr is higher than 1 000×10-6 in the limestone-based rock, but the content of Sr is less than 1 000 × 10-6 in the limestone with higher argillaceous. The content of B mostly distributes in (7.77-122) ×l0-6. For mud samples, the B/Ga ratio is greater than 4, and the Sr/Ba ratio is greater than 1. For carbonate samples, the Sr/Ba ratio ranges from 2.3 to 20.33, up to 33.98, and the B/Ga ratio is less than 10, mainly from 2 to 5, reflecting the alteration between freshwater and brackish sedimentary environments.关键词
微量元素/碳氧同位素/湖相碳酸盐岩/沙一段/齐家务地区/渤海湾盆地Key words
trace element/ carbon and oxygen isotope/ lacustrine carbonate rock/ first member of Shahejie Formation/ Qijiawu area/ Bohai Bay Basin分类
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高胜利,王连敏,武玺,高鹏鹏..渤海湾盆地黄骅坳陷齐家务地区沙一下亚段湖相碳酸盐岩储层地球化学特征[J].石油实验地质,2012,34(3):309-313,5.基金项目
国家重大专项项目(2008ZX05005-004-007HZ)资助. （2008ZX05005-004-007HZ）
