摘要
文中针对南海东部惠州A油田开发中遇到的油层局部低幅度微构造预测不准确的难题展开研究,认为该问题与浅层粉砂质泥岩有关——研究区浅层粉砂质泥岩地震波速度相对泥岩更高,泥岩沉积背景下厚度变化频繁的粉砂质泥岩形成了“速度陷阱”。针对研究区测井声波数据浅层缺失而无法指导速度研究的问题,采用地震融合属性描述异常地质体平面分布,并进一步提出有限列举最优化层速度体建模时深转换方法予以解决。该方法在已知范围内等间隔给定有限个数的速度异常校正量,用于优化构造格架约束下的初始层速度模型,然后根据所选定标志层的误差变化趋势,确定速度校正量最优值,更新层速度模型后进行时深转换,获得了更准确的等深图。目的层H1油藏老构造图存在南北2个含油区,新构造图鞍部抬升,南北含油区连片。研究成果有效指导了开发井位优化,并得到了钻井证实。
The uncertainty of structure map encountered in the development of Huizhou A oilfield in the eastern South China Sea is studied,considering that the problem is related to shallow silty mudstone--the seismic wave velocity of the shallow silty mudstone is higher than that of the mudstone.The silty mudstone cause a velocity snare,which thickness changes rapidly under the background of mudstone deposition.Aiming at the problem that the logging acoustic data in the study area cannot guide the velocity research due to the lack of shallow layers,seismic attribute fusion is used to describe the plane distribution of abnormal geological bodies,and a finite enumeration optimization velocity modeling method is proposed.The method gives a finite number of velocity anomaly corrections at equal intervals within a known range,which is used to optimize the initial layer velocity model under structural lattice constraints.Then the optimal velocity correction value is determined according to the error variation trend of the selected marker layer.After updating the layer velocity model,depth structural map can be obtained more accurately by the time-depth conversion.There are the northern and southern oil-bearing areas in the old structural map of H1 reservior,and the saddle of the new structural map is uplifted and the oil-bearing areas in the north and south are contiguous.The research result effectively guides the optimization of the development well location and is confirmed by drilling.
作者
刘振
李熙盛
沈水荣
闫正和
李伟
黄余金
LIU Zhen;LI Xisheng;SHEN Shuirong;YAN Zhenghe;LI Wei;HUANG Yujin(Shenzhen Branch of CNOOC Ltd.,Shenzhen 518000,China)
出处
《断块油气田》
CAS
CSCD
北大核心
2021年第6期823-828,共6页
Fault-Block Oil & Gas Field
基金
中海油总公司“十三五”重大项目“海相砂岩‘双特高’开发后期提高采收率技术”(CNOOC-KJ 135 ZD XM 22 SZ)。
关键词
粉砂质泥岩
高速异常
有限列举最优化求解方法
速度模型
微构造
silty mudstone
high velocity anomaly
finite enumeration optimization method
velocity model
micro-structure
