摘要
针对松辽盆地古龙页岩页理缝发育,孔隙度、渗透率极低,页岩油难以动用的问题,利用古龙页岩天然柱塞岩心,基于核磁共振扫描分析,分别开展离心法和气驱法2种方法的页岩可动流体饱和度评价,并与古龙地区致密砂岩进行了对比实验分析。结果表明:普通砂岩离心力选择标准已经不适合古龙页岩油,离心法也已经不适用于古龙页岩油可动流体评价,采用离心机最高转速,页岩岩心出现了严重的破碎,可动流体饱和度最高只达到了6.32%,远小于普通砂岩的可动流体饱和度,采用CO_(2)驱替可动用的页岩油达到了32.61%,远高于离心实验结果,显示CO_(2)驱替法在研究页岩油可动流体方面优于离心法。该方法评价古龙页岩油的可动流体饱和度是可行的,为古龙页岩油高效益开发提供了理论依据。
In view of the problems of lamellation fractures developed,the extremely low porosity and permeability and difficulty for producing oil of Gulong shale in Songliao Basin,2 methods including centrifugation and gas drive are respectively applied in evaluation on movable fluid saturation of shale by using natural core plugs of Gulong shale and based on NMR scanning analysis,and comparison experimental analysis with tight sandstone in Gulong area is performed.The research shows that the centrifugal force selection criteria for conventional sandstone is not suitable for Gulong shale oil,and centrifugation method is not suitable for movable fluid evaluation of Gulong shale oil.When using maximum rotational speed of centrifuge,shale cores are seriously broken,and maximum movable fluid saturation is only 6.32%,much less than movable fluid saturation of conventional sandstone,while producible shale oil by CO_(2)displacement is 32.61%,much higher than centrifugation experimental results,showing that CO_(2)displacement is better than centrifugation method in studying movable fluid of shale oil.This method is feasible to evaluate movable fluid saturation of Gulong shale oil,and provides theoretical basis for high-efficiency development of Gulong shale oil.
作者
李斌会
邓森
刘勇
曹胜
金大伟
董大鹏
LI Binhui;DENG Sen;LIU Yong;CAO Sheng;JIN Dawei;DONG Dapeng(Exploration and Development Research Institute of PetroChina Daqing Oilfield Co Ltd,Daqing 163712,China;Heilongjiang Provincial Key Laboratory of Reservoir Physics&Fluid Mechanics in Porous Medium,Daqing 163712,China)
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2022年第3期130-138,共9页
Petroleum Geology & Oilfield Development in Daqing
基金
中国石油天然气股份有限公司重大科技专项“大庆古龙页岩油勘探开发理论与关键技术研究”(2021ZZ10)。
