摘要
大港油田沧东凹陷官东地区页岩油井钻井过程中,大量钻井新工艺技术的采用,使得钻速加快、岩屑细碎,导致录井岩性难以识别和层位划分困难,为此在现场录井过程中采用了元素录井技术。基于该区域页岩油井的钻探目的,选取了Ek1底部-Ek2顶部、C 1底部-C 2-C 3顶部等关键目的层位进行了元素分析,进行元素数据统计、变化规律分析及曲线特征识别等研究,10口井的元素录井技术应用结果表明该区域关键目的层位元素录井参数变化有规律可循,由Ek1底部-Ek2顶部,Si元素降低,Ca、Mg、Fe、K、S、Mn元素均有不同程度升高;由C 1底部-C 2-C 3顶部,Si、Fe、Al元素先升高后降低,Ca、Mg元素先降低后升高,最终形成了该区域元素录井地层划分方法,为沧东凹陷官东地区下步页岩油井钻探提供了地层划分依据和借鉴。
During the drilling of shale oil wells in Guandong area of Cangdong Sag,Dagang Oilfield,a large number of new drilling techniques accelerated the drilling rate and finely fragmented cuttings,resulting in difficult lithology identification for mud logging and difficulty in formation division.For this reason,element logging technology is applied in on-site mud logging.Based on the drilling propose of shale oil wells in this area,the key target horizons such as the bottom of Ek1-the top of Ek2,and the bottom of C 1-C 2-the top of C 3 were selected for element analysis,and element data statistics,variation law analysis and curve feature identification were performed.The application results of element logging technology in 10 wells show that the logging parameters of the key target horizons in this area change regularly.From the bottom of Ek1-the top of Ek2,Si element decreases,and the Ca,Mg,Fe,K,S and Mn elements increase to varying degrees.From the bottom of C 1-C 2-the top of C 3,Si,Fe and Al elements first increase and then decrease,and Ca and Mg elements first decrease and then increase.A method for stratigraphic division for element logging in this area was finally formed,providing the basis and reference for stratigraphic division for shale oil wells drilling in Guandong area,Cangdong Sag.
作者
杨绍存
李长洪
董峰
王建伟
张阳
殷文荣
施宝海
姜波
范世强
YANG Shaocun;LI Changhong;DONG Feng;WANG Jianwei;ZHANG Yang;YIN Wenrong;SHI Baohai;JIANG Bo;FAN Shiqiang(No.1 Mud Logging Company,BHDC,CNPC,Tianjin 300280,China;Staff Education and Training Center,BHDC,CNPC,Tianjin 300280,China)
出处
《录井工程》
2020年第S01期7-12,共6页
Mud Logging Engineering
关键词
元素录井
页岩油
卡层
沧东凹陷
沉积相
地层划分
岩屑
element logging
shale oil
strata determination
Cangdong Sag
sedimentary facies
stratigraphic division
cutting
