柳27区长2低阻油层主控因素分析及有效识别  

Analysis and effective identification of main controlling factors of formation of Chang2 low-resistance oil layer in Liu27 block

作　　者：黄闯 李硕 宁涛 宜海友 申锦江 任宇飞 周武 HUANG Chuang;LI Shuo;NING Tao;YI Haiyou;SHEN Jinjiang;REN Yufei;ZHOU Wu(Exploration and Development Research Center,Yanchang Oil Field Co.,Ltd.,Shaanxi Yan′an 716000,China;Headquarters of Watet Injection Project Area,Yanchang Oil Field Co.,Ltd.,Shaanxi Yan′an 716000,China)

机构地区：[1]延长油田勘探开发技术研究中心,陕西延安716000 [2]延长油田注水项目区管理指挥部,陕西延安716000

出　　处：《非常规油气》2021年第6期32-39,共8页Unconventional Oil & Gas

基　　金：延长油田股份有限公司科技项目“延长油田主力油区综合地质研究”(ycyt2020ky-C-02)。

摘　　要：低阻油层是一类特殊的油气层,其电阻率和水层相近,在测井解释中不易与水层区分,给油田开发带来极大困扰。通过对吴起地区柳27区块长2低阻油层形成原因进行综合分析,确定该区低阻油层形成的主控因素为低构造幅度、高地层水矿化度和高束缚水饱和度。在成因分析的基础上,应用ΔlgR技术选取研究层段水层电阻作为基线,将长2段声波时差曲线和深电阻率曲线反向叠合,砂岩段曲线分开的层段即为油层,经验证试油最终符合率高达97.1%。该技术显著提高了研究区低阻油层的识别能力,对其他地区低阻油层判别具有一定的指导意义。Low-resistance oil layer is a special kind of oil and gas layer, whose resistivity is similar to that of water layer, and it is not easy to distinguish from water layer in logging interpretation, which brings great diffculties to oilfield development.Through comprehensive analysis of the reasons for the formation of the Chang2 low-resistance oil layer in Liu27 block in Wuqi Area, low structural amplitude, high mineralization degree’s formation water and high irreducible water saturation are the main controlling factors for the formation of the low-resistance oil layer in this area.Based on the analysis of the causes, the water layer resistance of the study layer is regard as the baseline by ΔlgR technology, by which the Chang2 segment sonic time difference curve and the deep resistivity curve are reversely superimposed. The interval separated by the sandstone curve is the oil layer, and the final coincidence rate of the oil test is as high as 97.1%.The technology significantly improves the ability to identify low-resistance oil layers in the study area, and will play a guiding role for recognizing low-resistance oil layers in other areas.

关 键 词：长2油层 低阻油层 主控因素 ΔlgR 

分 类 号：TE122[石油与天然气工程—油气勘探]