鄂尔多斯盆地志丹地区长8致密油储层“甜点”识别与优选——以永宁油田YT9井区为例  

The Identification and Optimization of the"Sweet Spot"in the Chang 8 Tight Oil Reservoir Located in the Zhidan Area of the Ordos Basin—Taking YT9 Well Area in Yongning Oilfield as an Example

作　　者：薛刚 张伟杰 郭梦炎 姜鹏飞 XUE Gang;ZHANG Weijie;GUO Mengyan;JIANG Pengfei(Zhidan Oil Production Plant,Yanchang Oilfield Co.,Ltd.,Yan′an 717500,China)

机构地区：[1]延长油田股份有限公司志丹采油厂,陕西延安717500

出　　处：《河北地质大学学报》2025年第2期50-58,共9页Journal of Hebei Geo University

基　　金：延长石油科研项目(ycsy2022qt-B-1-2-12-1)。

摘　　要：鄂尔多斯盆地志丹地区长8储层发育细粒长石砂岩,储层呈特低-超低渗透特征,属典型的致密砂岩储层。近几年永宁油田YT9井区长8致密油发现了一定的工业油流,但勘探开发进展较慢,有必要对该区域的储层“甜点”与识别进行优选。本文通过岩心观察、试验分析、录井、测井及生产测试等数据,以叠置交汇法对长8致密油储层岩性、物性、电性与含油性之间的四性关系进行了对比分析。结果表明:YT9井区可以有效开发的致密油储层“甜点”区位于YT7-YT9-Y207井区及YT6井区的长8_(2)储层,其四性下限取值为综合录井保持为油迹级以上,孔隙度大于8.0%、渗透率大于0.2 mD,电测参数下限值为声波时差223μs/m、电阻率25Ω·m,有效厚度为6 m以上,本次研究明确了永宁油田YT9井区长8致密油藏有效储层的识别标准,并按照储层含油性、综合录井显示、油层厚度等参数优选储层“甜点”,为区域长8致密油水平井开发规避了一定风险。The Chang 8 reservoir in Zhidan area of Ordos Basin is a typical tight sandstone reservoir with fine grained arkose and ultra-low permeability.In recent years,Chang 8 tight oil in YT9 well area of Yongning Oilfield has found a certain industrial oil flow.However,the progress of exploration and development is slow,and it is necessary to optimize the reservoir sweet spot and identification in this area.Based on the data of core observation,test analysis,logging,well logging and production testing,the relation between lithology,physical property,electrical property and oil content of Chang 8 tight oil reservoir is analyzed by means of overlapping intersection method.The results show that the"sweet spot"of tight oil reservoir in YT9 well area is located in YT7-YT9-Y207 well area and Chang 8_(2) reservoir in YT6 well area.The minimum requirements for its four properties are as follows:comprehensive logging should be maintained above the oil trace level,porosity should exceed 8.0%,permeability should exceed 0.2 mD,electrical measurement parameters should have a lower limit of 223μs/m and resistivity of 25Ω·m,and effective thickness should be no less than 6m.In this study,the identification criteria of effective reservoir of Chang 8 tight oil reservoir in YT9 well area of Yongning Oilfield are clarified,and the reservoir"sweet spot"is selected according to the parameters of reservoir oil content,comprehensive logging display,and oil thickness,which avoids certain risks for the development of regional Chang 8 tight oil horizontal Wells.

关 键 词：鄂尔多斯盆地 志丹地区 致密油 储层优选 “甜点”识别 

分 类 号：TE122[石油与天然气工程—油气勘探]