陕北志丹地区长6低电阻率油层成因机制研究  

Genetic mechanism research of Chang 6 low resistivity oil layer in Zhidan region,Northern Shaanxi

作　　者：谢青[1,2] 杨兴科[1] 梁莉 

机构地区：[1]长安大学地球科学与资源学院,陕西西安710054 [2]西安石油大学地球科学与工程学院,陕西西安710065 [3]中国石油西部管道兰州输气分公司,甘肃兰州730070

出　　处：《西安科技大学学报》2015年第2期214-220,共7页Journal of Xi’an University of Science and Technology

基　　金：陕西省自然科学基础研究项目(2010JM5003);中国地调局项目(12120113039900)

摘　　要：低电阻率油藏作为一种非常规油藏已被人们所认知,由于成因机制复杂,识别难度大,常被人们遗漏或错判。为了详细研究陕北志丹地区低电阻率油层的成因机制,以长6储层为研究目的层位,采用实验分析、测井曲线重叠法、交会图等方法,建立相关的平、剖面图,并结合研究区试油试采成果,对长6储层低电阻率油层的成因机制进行了深入分析。认为志丹油区低阻油层发育众多,资源潜力大,约占其总储量的40%,分布广泛,成因机制复杂,很难用常规方法进行识别;多数油层电阻率主要介于2~21Ω·m之间,甚至小于0.6Ω·m.最终得出沉积砂体控制作用、岩性细,束缚水饱和度高、粘土附加导电性和高放射性砂岩是长6低电阻率油层发育的主要因素;由于区域地质状况的差异,初步探索出了适合研究区的低电阻率油层识别标准,以便为以后研究低阻油藏提供参考与借鉴。Low resistivity reservoirs have been cognitive as a kind of unconventional reservoirs. Due to its complex genetic mechanisms and difficult identification,thus a large number of oil and gas resources are abandoned or miscalculation. In order to research genetic mechanism of resistivity reservoir in Zhidan region,northern Shaanxi,Chang 6 reservoir as a research layer,using experimental analysis,well logging curve overlapping,cross-plot method,et al,setting up relevant plans and profiles,combined with oil and production test,a in-depth research of the genetic mechanism of Chang 6 low resistivity reservoir has been made. Research results show： many low resistivity oil layers developed in Zhidan region,the resource potential is tremendous,which accounts for about 40% of its total oil-gas resource with wide distribution and complexity genetic mechanism,and it＇s difficult to identify them with traditional methods;Most of the oil layers resistivity are mainly from 2 to 21 Ω·m,some of them are lower than 0. 6 Ω·m.Sedimentary sand body rhythm control,fine lithology,high irreducible water saturation,clay with conductive ability and highly radioactive sandstone are the main causes for the Chang 6 low resistivity oil layers; Because of the difference of regional geological conditions,the suitable identifying standards of low resistivity reservoir are explored in the study area,to provide more references for the later research on low resistivity oil layer.

关 键 词：低电阻率油层 成因机理 识别标准 志丹地区 

分 类 号：TE311[石油与天然气工程—油气田开发工程]