【摘要】：塔里木盆地塔河地區(qū)在早二疊世末存在2種性質(zhì)的巖漿活動,基性及中酸性巖漿,分別源自地幔和地殼,巖漿熱液流體作為一種化學(xué)活動性物質(zhì)在其運移過程中對奧陶系碳酸鹽巖儲層產(chǎn)生溶蝕改造。塔河?xùn)|南斜坡奧陶系縫孔洞方解石包裹體均一溫度達(dá)到247℃,鹽度遠(yuǎn)大于奧陶紀(jì)同期海水,δ~(18) O值為-15.38‰~-8.04‰,異常偏低,溶蝕區(qū)微量元素測定也反映了高Fe、高Mn、低Na的特征,指示了深部高溫?zé)嵋毫黧w作用的存在。~(87)Sr/~(86)Sr值為0.705 368~0.715 889,表現(xiàn)為高于和低于微晶灰?guī)r背景值2種類型,分別代表了殼源鍶和幔源鍶的特征。稀土元素配分曲線也表現(xiàn)為2種不同特征,一類右傾,正Eu異常,一類較平緩,負(fù)Eu異常,LREE/HREE值和(La/Yb)_N值也同時顯示為較高值和高值2個部分,與基性和中酸性巖漿巖的稀土特征相似。反映了海西晚期塔河?xùn)|南斜坡奧陶系受到了2種性質(zhì)巖漿來源熱液流體的影響,該熱液流體沿疏導(dǎo)層運移對碳酸鹽巖儲層進行溶蝕產(chǎn)生孔洞、孔隙,同時伴隨熱液礦物的沉淀,但顯著改善了儲集物性,仍具有一定的儲集意義,對深部碳酸鹽巖儲層的形成具有重要意義。
[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，

本文編號：2387508