塔里木盆地轮古西地区奥陶系残留地层古岩溶形成及储渗能力分析

STUDY ON THE FORMATION AND PERMEABILITY OF THE PALAEOKARST IN ORDOVICIAN RESIDUAL STRATA IN WESTERN LUNGU, TARIM BASIN

摘要: 塔里木盆地轮古西地区奥陶系地层受海西早期大幅度抬升影响，剥蚀厚度较大，古岩溶十分发育，仅存中晚奥陶世鹰山组及蓬莱坝组，并受岩性和地质构造控制，具有较好的储渗能力.通过对轮古西地区的地质背景、古岩溶状况进行了研究，探索了该地区古岩溶的形成机理、控制因素，并对其储渗能力进行了分析.

Abstract: The Ordovician strata in Western Lungu, Tarim Basin is considerably eroded by the Early Hercynian uplifting, with well developed palaeokarst. The only outcropped strata are the Middle and Late Ordovician Yingshan and Penglaiba formations, which are controlled by lithology and structure, with capable reservoir and permeation. Based on the analysis of the palaeokarst with the geological background in the area, the forming mechanism and control factors, as well as the capacity of reservoir and permeation, are studied.