塔里木盆地塔河油田东南斜坡海西晚期奥陶系热液作用
发布时间：2018-12-20 05:37
【摘要】：塔里木盆地塔河地区在早二叠世末存在2种性质的岩浆活动,基性及中酸性岩浆,分别源自地幔和地壳,岩浆热液流体作为一种化学活动性物质在其运移过程中对奥陶系碳酸盐岩储层产生溶蚀改造。塔河东南斜坡奥陶系缝孔洞方解石包裹体均一温度达到247℃,盐度远大于奥陶纪同期海水,δ~(18) O值为-15.38‰~-8.04‰,异常偏低,溶蚀区微量元素测定也反映了高Fe、高Mn、低Na的特征,指示了深部高温热液流体作用的存在。~(87)Sr/~(86)Sr值为0.705 368~0.715 889,表现为高于和低于微晶灰岩背景值2种类型,分别代表了壳源锶和幔源锶的特征。稀土元素配分曲线也表现为2种不同特征,一类右倾,正Eu异常,一类较平缓,负Eu异常,LREE/HREE值和(La/Yb)_N值也同时显示为较高值和高值2个部分,与基性和中酸性岩浆岩的稀土特征相似。反映了海西晚期塔河东南斜坡奥陶系受到了2种性质岩浆来源热液流体的影响,该热液流体沿疏导层运移对碳酸盐岩储层进行溶蚀产生孔洞、孔隙,同时伴随热液矿物的沉淀,但显著改善了储集物性,仍具有一定的储集意义,对深部碳酸盐岩储层的形成具有重要意义。
[Abstract]:At the end of the early Permian, there were two kinds of magmatic activities in Tahe area, Tarim Basin, which originated from mantle and crust, respectively. Magmatic hydrothermal fluid, as a kind of chemical active material, has been dissolved in Ordovician carbonate reservoir during its migration. On the southeast slope of Tahe River, the homogenization temperature of calcite inclusions in the Ordovician joint cavity is 247 鈩，
本文编号：2387508
[Abstract]:At the end of the early Permian, there were two kinds of magmatic activities in Tahe area, Tarim Basin, which originated from mantle and crust, respectively. Magmatic hydrothermal fluid, as a kind of chemical active material, has been dissolved in Ordovician carbonate reservoir during its migration. On the southeast slope of Tahe River, the homogenization temperature of calcite inclusions in the Ordovician joint cavity is 247 鈩，
本文编号：2387508
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