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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,δ18O值为-15.38‰~-8.04‰,异常偏负,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.87Sr/86Sr值为0.705368~0.715889,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.
There are two types of magmatic, basic and intermediate magmatic magma in Tahe area at the end of Early Permian, which are derived from mantle and crust respectively. Magmatic hydrothermal fluid, as a kind of chemical active material, The dissolution and modification of the Tao-Carboniferous reservoirs resulted in the homogenization of the inclusions in the Ordovician stratums in the southeastern slope of the Tahe River at a temperature of 247 ℃, much higher than that of the Ordovician seawater during the same period. The δ18O values ranged from -15.38 ‰ to -8.04 ‰ , And the anomaly is negative. The determination of trace elements in the dissolution zone also reflects the characteristics of high Fe, high Mn and low Na, indicating the existence of deep high temperature hydrothermal fluids. The values of 87Sr / 86Sr range from 0.705368 to 0.715889, showing above and below There are two types of microcrystalline limestone background values, which represent the characteristics of crustal source strontium and mantle source strontium, respectively. There are two different characteristics of REE distribution curve, one is right-dip and positive Eu anomalies, one is relatively flat and negative The Eu anomaly, LREE / HREE and (La / Yb) N values also show two parts of higher and higher values, which are similar to those of basic and intermediate magmatic rocks, reflecting the late Hercynian Tahe River southeast The slope Ordovician was affected by two magmatic source magmatic hydrothermal fluids along the The migration of the guide layer leads to the formation of vugs and pores in the carbonate reservoirs, accompanied by the precipitation of hydrothermal minerals, but significantly improves the reservoir properties, which still has some reservoir significance. For the deep carbonate reservoirs The formation of great significance.