超低渗致密砂岩浅层气特征与识别方法  

The Characteristics and Recognition Method of Shallow Layer Gas in Ultra-low Permeability Tight Sandstone

作　　者：张添锦 郭爱华[2] 张金良[2] 彭红霞[3] ZHANG Tian-jin;GUO Ai-hua;ZHANG Jin-liang;PENG Hong-xia(College of Petrol and Environmental Engineering,Yan＇an University,Yan＇an 716000,China;Yanchang Petroleum.Co.Ltd.,Xingzichuan Oilfield,Yan＇an 717400,China;Yanchang Petroleum.Co.Ltd.,Dingbian Oilfield,Yulin,718600,China)

机构地区：[1]延安大学石油学院,陕西延安716000 [2]延长油田股份有限公司杏子川采油厂,陕西安塞717400 [3]延长油田股份有限公司定边采油厂,陕西榆林718600

出　　处：《延安大学学报（自然科学版）》2018年第2期47-52,共6页Journal of Yan'an University：Natural Science Edition

基　　金：延安市科技局项目(2017WZZ-01-02);延安大学青年项目(YDQ2017-21)资助

摘　　要：针对超低渗致密砂岩浅层气识别不清,导致油井井喷、井涌事故多发的问题,以安塞真武洞浅气层为例,利用录井、测井和试气资料,研究了浅气层识别和分类方法,分析浅层气气测和电测特性,制定浅层气的分类和识别模板,结果表明:浅层气可进一步分为浅层气层和浅层油层气,浅层气层气测特征C1/C2、C1/C3、C1/C4均高于油层气的比值;C1百分含量和C2/C3的比值更具有明显的差异,其电测特征表现在电阻率和声波时差上,浅层气层声波时差普遍高,声波时差一般大于270μs/m;油层气声波时差一般介于230~270μs/m之间。利用气测图版及和声波时差与电阻率图版可以有效的识别和划分浅层气层和浅层油层气。Because the classification and enrichment regularity of the shallow gas was unclear,well blowout and well kick has happened several times,as Zhenwudong oilfield of Ansai area for example. The property of shallow gas including resistance and gas-logging has been analysed,using the data of mud logging,well logging and oil testing. The identification and classification of shallow gas has been studied,and the chart of classification and identification of shallow gas has been made. The results showed that the shallow gas can be divided into shallow gas-bearing layer and associated gas reservoir,and the ratio of C1/C2,C1/C3 and C1/C4 of shallow gas-bearing layer was higher than that of associated gas reservoir. The percentage of C1 and C2/C3 of shallow gas-bearing layer was apparently different from that of associated gas reservoir,the data of ILD and DT of shallow gas-bearing layer was obviously different from that of associated gas reservoir. The DT of shallow gas-bearing layer was generally higher than 270 μs/m,while that of associated gas reservoir was generally between 230 and 270 μs/m. The shallow gas-bearing layer and associated gas reservoir can be identified effectively by using of parameters including C1 and C2/C3 or the chart of DT and ILD.

关 键 词：致密砂岩 浅层气层 油层气 含气单砂体 

分 类 号：TE122[石油与天然气工程—油气勘探]