基于缝洞方解石包裹体测试分析塔北轮南地区奥陶系古岩溶期次及环境  

Analysis of Palaeokarst Periods and its Environmental in Lunnan Ordovician of Tarim Basin :From Fluid Inclusion Test of Calcite in Fracture or Vug

作　　者：淡永[1,2] 梁彬[1,3] 曹建文[1,3] 张庆玉[1,3] 

机构地区：[1]中国地质科学院岩溶地质研究所,广西桂林541004 [2]成都理工大学沉积地质研究院,四川成都610059 [3]国土资源部/广西岩溶动力学重点实验室,广西桂林541004

出　　处：《新疆地质》2015年第1期95-100,共6页Xinjiang Geology

基　　金：国家自然基金青年基金(41302122);973计划项目(2011CB201001);国土资源部公益性行业科研专项(201211082);所控项目(201305)共同资助

摘　　要：塔里木盆地轮南地区奥陶系岩溶缝洞发育,但多期水-岩作用对缝洞改造复杂。基于轮南地区岩溶缝洞方解石包裹体测试,总结了该地区包裹体的物理、化学特征,发现轮南地区以单液相、气液两相包裹体为主,并按包裹体盐度-均一温度将气液两相包裹体划分为6类不同成因类型包裹体。结合埋藏史分析,认为轮南地区上述包裹体可能形成于4期岩溶作用阶段,包括表生期暴露淡水岩溶、浅埋藏岩溶、中埋藏岩溶及深埋藏岩溶。以上研究为判断轮南地区奥陶系风化壳岩溶缝洞形成后,埋藏阶段多期水-岩作用对缝洞的改造效应提供依据。It is widely development that palaeokarst fracture-vug are in the Ordovician in Lunnan area of Tarim Basin,but palaeokarst fracture-vug reconstruucted intricately by multi-period water-rock interaction later. Based on the test of calcite inclusion in karst fracture-vug in Lunnan area, the physical and chemical characteristics of inclusions are summarized.It is found that single liquid phase and gas-liquid phase inclusions are mainly inclusions in Lunnan area.According to homogenization temperature and concentration of calcite inclusion,gas-liquid phase inclusions are divided into six different genetic types of inclusions. Finally,combined with burial history analysis of Lunnan area,it is suggested inclusions mentioned above may be formed during four period karstification stage,including the supergene period of exposure to fresh water karst, shallow buried karst,medium buried karst and depth buried karst.These research results can provide evidence for reservoir reconstruction during burial stage,which are by multi-period water-rock interaction,after Ordovician weathering crust palaeokarst fracture-vug formed in Lunnan area.

关 键 词：轮南古潜山 鹰山组 埋藏岩溶 均一温度 埋藏史 岩溶作用 

分 类 号：P618.13[天文地球—矿床学] P534.42[天文地球—地质学]