地质学报2012，Vol.86Issue(10)：1688-1695,8.
黄骅坳陷齐家务地区储层地球化学特征及其相关问题讨论
Geochemical Characteristics and Dicussion on Related Problems of Sha 1 Sub-member Carbonate Reservoirs in the Qijiawu Area in Huanghua Depression
摘要
Abstract
The lower first member of Shahcjic Formation (Sha 1 Sub-member) in the Qijiawu area in Huahua depression is dominated by carbonate reservoirs. Lithochemical analysis of 10 cores, carbon and oxygen isotopic and trace element compositions show that the content of Si()2 , AI2 O3 and Ca() are relatively high, while the content of MgC) varies with the difference of lithology. SiO2 is positively correlated with AI2():; so SiO2 and K2O I Na2O, but is negatively associated with the MgO, indicating that SiO2 enrichment is subject to terrestrial material source and pH value of water in lake basin. With linearly increasing of ALO3 and K2O+Na2O, increasing MgO is against SiO2 enrichment. Most of C and () isotopic Z-value in each layer are higher than 120, indicating that frequent marine transgression resulted in salinization of water in which lacustrine carbonatic rock deposited. Decreasing δ18 O value shows that C()2 and CO contained in hydrothermal fluid migrating along fault during deposition of Shal sub-member in the study resulted in further depletion of δJ18O value in lacustrine carbonatic rock due to fractionation under the high temperature and pressure. The reason for relatively high contents of metals (such as Cu, Pb, Zn, Cr, Ni, and Ga) in various carbonatic rocks is related to frequent marine transgression and strong reduction environment, while change of Sr, Ba and B are restrained by addition of terrestrial material and ancient weather condition. Detailed studies of petrochemical composition, C and O isotopic analysis, and trace elements contents establish the geochemical basis for reconstructing ancient geographical environment of Sha 1 sub member rock facies and predicting favorable reserves zones in the studying area.关键词
齐家务地区/沙一下段/碳酸盐岩储层/湖盆沉积/碳氧同位素/微量元素Key words
Qijiawu Area/ first member of Shahejie Formation/ carbonate reservoir/ lake basin sedimentation/ carbon and oxygen isotope/ trace elements引用本文复制引用
高胜利,王连敏,武玺,李泽敏,高鹏鹏..黄骅坳陷齐家务地区储层地球化学特征及其相关问题讨论[J].地质学报,2012,86(10):1688-1695,8.基金项目
本文为国家重大专项项目(编号2008ZX05005-004-007HZ)资助的成果. （编号2008ZX05005-004-007HZ）
