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Evidence for origin and mixing of oillield waters from Paleozoic strata in Tazhong area
Author(s): 
Pages: 504-510
Year: Issue:  5
Journal: GEOCHIMICA

Keyword:  稳定同位素水化学油田水成因地质流体塔里木盆地;
Abstract: 塔中地区奥陶系、志留系和石炭系油田水的主元素、微量元素、87Sr/86Sr、δ18O、δ18O及全岩的87Sr/86Sr测试结果表明,油田水相对于海水蒸发曲线,富Sr2+、Ca2+、CF而贫K+、Mg2+,系水-岩反应改造的产物,远高于海水的87Sr/86Sr值表明油田水具有钾长石等矿物溶解的影响.油田水87Sr/86Sr-1/Sr的关系显示具有两种混合趋势,一种是奥陶系油田水向上运移与志留系和石炭系油田水的混合,以及侧向上来自西北部富87Sr的油田水向东运移;另一种是低Sr的淡水与油田水的混合作用.油田水的运移与混合方向指示了油气运移或调整再分配的方向.
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