鄂尔多斯盆地合水南部低阻砂岩油藏成因及其测井识别  

Genesis and logging identification of low resistance sandstone reservoirs in southern Heshui,Ordos Basin

作　　者：易涛 郁林军 陈建文 顿亚新 章宏波 邓海超 吴雨风 Yi Tao;Yu Linjun;Chen Jianwen;Dun Yaxin;Zhang Hongbo;Deng Haichao;Wu Yufeng(The 12th Oil Production Plant,Changqing Oilfield Branch,PetroChina,Qingyang 745400,China;School of Earth Science and Resources,Chang′an University,Xi′an 710054,China)

机构地区：[1]中石油长庆油田分公司第十二采油厂,甘肃庆阳745400 [2]长安大学地球科学与资源学院,陕西西安710054

出　　处：《能源与环保》2025年第2期131-139,共9页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：国家科技重大专项(2016ZX05056)。

摘　　要：为解决合水南部地区低电阻砂岩油藏油层低阻成因不明、识别困难等问题,基于测井二次解释理论,利用地层水地球化学数据,结合试采数据、测井数据等,分析了合水南部延7—长3段低阻砂岩油藏成因,总结了识别低阻油层的测井图版,为研究区调整剩余油开发方案提供了依据。研究结果表明,高矿化度的CaCl_(2)和MgCl_(2)型地层水是造成合水南部延7—长3段油层低阻(<20Ω·m)的主控因素,Na_(2)SO_(4)型地层水则会导致含油层电阻率较高(>20Ω·m);常规的电阻率—声波时差以及视电阻增大率—声波时差图版能区分低阻油藏中的纯水层与非纯水层,而视地层水电阻率特征值分布累积曲线能进一步区分非水层中的油层、油水同层,对精确识别低阻砂岩油甜点、调整低阻油藏开发方案意义重大。In order to solve the problem of low-resistance sandstone reservoir in the southern Heshui area,based on the logging secondary interpretation theory,using the geochemical data of the formation water combined with trial production data and well logging data,the formation of the low resistance sandstone reservoir was analyzed and the loggoing pattern for identifying the low resistance oil reservoirs was summarized,providing a basis for the adjustment of the remaining oil development scheme in the research area.The results show that the high salinity of MgCl_(2)and CaCl_(2)formation water is the main controlling factor of low resistance(<20Ω·m)of the Yan 7-Chang 3 oil reservoirs in the southern part of Heshui,Na_(2)SO_(4)formation water causes higher oil reservoir resistivity(>20Ω·m).The conventional resistivity-acoustic time difference and apparent resistivity increase rate-acoustic time difference charts can distinguish between pure water layers and non pure water layers in low resistance oil reservoirs.The cumulative distribution curve of the characteristic values of the apparent formation water resistivity can further distinguish oil reservoirs and oil-water reservoir in non water layers,which is of great significance for accurately identifying oil sweet-point in low resistance sandstone and adjusting the development scheme of low resistance reservoirs.

关 键 词：鄂尔多斯盆地 合水南部 低阻砂岩油藏 视地层水电阻率 甜点识别 

分 类 号：P618.13[天文地球—矿床学]