阿克库勒凸起中-上奥陶统地层划分及加里东中期第Ⅰ幕古喀斯特特征  

Stratigraphic division of Middle-Upper Ordovician and characteristics of the first episode karstification of Middle Caledonian in Akekule uplift,Xinjiang,China

作　　者：刘存革[1,2] 李涛[2] 吕海涛[2] 丁勇[2] 

机构地区：[1]中国石油大学盆地与油藏研究中心,北京102249 [2]中国石化西北油田分公司,乌鲁木齐830011

出　　处：《成都理工大学学报（自然科学版）》2010年第1期55-63,共9页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家重点基础研究发展规划"973"项目(2005CB422108)

摘　　要：随着阿克库勒凸起奥陶系油气勘探向外围拓展,需要重新认识中-上奥陶统地层划分方案和加里东中期第Ⅰ幕古喀斯特作用。通过岩心、FMI成像测井、自然伽马能谱测井和古生物资料的对比分析,认为恰尔巴克组GR尖峰下面的含泥灰岩段归于上奥陶统,恰尔巴克组厚度受一间房组上段滩相沉积底形的控制,含泥灰岩段起到填平补齐的作用;FMI成像测井和自然伽马能谱测井中KU和KThU两个参数能较好地划分该界线,新方案在塔北具有借鉴意义。根据该地层划分方案,中-上奥陶统在S109-S119-S114井以南地区为连续沉积,以北的地区存在暴露剥蚀。加里东中期第Ⅰ幕喀斯特对北部的于奇地区影响较大。It is necessary to newly study the stratigraphic division of Middle-Upper Ordovician and the characteristics of the first episode karstification of Middle Caledonian along with the oil and gas exploration in the peripheral regions of the Akekule uplift in Xinjiang. Through comparing and analysing the bore cores, FMI image logging, NGS and conodont fossil, the argillaceous limestone segment under the GR peak of O3q （Upper Ordovician Qiaerbake Formation） belongs to Upper Ordovician, and the thickness of O3q is controlled by the bed form of shoal facies of O2yj （Middle Ordovician Yijianfang Formation）. The argillaceous limestone developed in depression areas. FMI and two parameters of NGS, Ku and KThu are effective means for this borderline, and this scheme is important for the north of Tarim area. According to this stratigraphic division scheme, thc areas to the south of Wells S109-S119-S114 are successive sedimentation for Middle-Upper Ordovician, and those to the north are exposed to the wether. The Yuqi regions in the north arc greatly influenced by the first episode karstification of Middle Caledonian.

关 键 词：阿克库勒凸起 中-上奥陶统 地层划分 古喀斯特 

分 类 号：TE121.3[石油与天然气工程—油气勘探]