鄂尔多斯盆地志丹油区延长组长6致密砂岩 储层裂缝识别  

Fracture Identification of Chang-6 Tight Sandstone Reservoir in Yanchang Formation of Zhidan Oil Region,Ordos Basin

作　　者：王晓琳 张小莉 WANG Xiaolin;ZHANG Xiaoli(Department of Geology,Northwest University/National&Local Joint Engineering Research Center of Carbon Capture and Storage Technology,Xi’an,Shaanxi 710069,China)

机构地区：[1]西北大学地质学系/二氧化碳捕集与封存技术国家地方联合工程研究中心,陕西西安710069

出　　处：《测井技术》2020年第4期404-410,共7页Well Logging Technology

基　　金：国家油气重大专项“深层-超深层沉积岩成岩作用与储层表征”(2017ZX05005-002-004);国家高技术研究发展计划(863计划)项目“页岩气勘探开发新技术”(2013AA064501)。

摘　　要：裂缝是致密储层主要的储集空间和渗流通道,它们影响到优良储层的展布和油气的富集规律,也决定了油气田的开发方式和井网部署。以鄂尔多斯盆地志丹油区延长组长6致密砂岩储层为研究对象,采用野外露头观测、岩心观察及常规测井、成像测井识别等方法对致密储层裂缝进行研究,系统总结常规测井和成像测井裂缝的响应特征。结果显示:裂缝在岩心上主要为垂直裂缝,部分层段裂缝集中程度相对较高;裂缝展布整体以北东—南西向为主;电阻率测井对裂缝响应较好,岩性测井对裂缝响应最不明显;构建的砂岩裂缝识别参数基本可以反映砂岩地层中的裂缝特征,裂缝展布主要受控于区域地应力和局部地应力,应力相对集中部位有利于裂缝发育。Fractures are the main reservoir space and seepage channels in tight reservoirs,which affect the distribution of good reservoirs and the accumulation of oil and gas,and also determine the development mode and well pattern deployment of oil and gas fields.Taking the tight sandstone reservoir of Yanchang formation in Zhidan oil region of Ordos basin as the research object,the fractures in the tight reservoir were studied by outcrop observation,core observation,conventional logging and imaging logging identification,and the response characteristics of fractures in conventional logging and imaging logging are summarized systematically.The results show that the fractures are mainly vertical in the core,and the concentration of fractures in some strata is relatively high.The fracture distribution is mainly in NE-SW direction;The resistivity log has better response to fractures,while the lithologic log has the least obvious response to fractures.The fracture identification parameters constructed by this study can basically reflect the fracture characteristics in sandstone stratum.The fracture distribution is mainly controlled by regional and local geostress,and the position with relatively concentrated stress is favorable for fracture development.

关 键 词：测井解释 裂缝识别 致密储层 长6油层组 志丹油区 鄂尔多斯盆地 

分 类 号：P631.84文献标识码:A[天文地球—地质矿产勘探]