摘要
“串珠状”反射是塔中地区缝洞型储层典型的主要反射特征,实际钻遇储层显示的放空漏失或溢流位置与串珠状反射相位对应关系复杂,钻井轨迹设计多解性严重。本文总结分析了塔中地区钻遇缝洞体及其组合对应的地震串珠状反射特征类型,设计了纵横向尺度、充填速度、形态及空间组合方式等要素不同的缝洞体模型,基于波动方程正演模拟和地震响应特征分析,明确了钻井放空漏失位置与串珠状反射特征类型及反射相位的对应关系,指出其“串珠状”反射的强波谷和强波峰之间的零相位附近最有可能是单个溶洞发育中心位置,或者是多个纵横向缝洞体组合中心并偏向速度最低的缝洞体位置,这些认识可为钻井轨迹设计提供指导。
Beadlike reflection is a typical reflection feature of fractured-vuggy reservoirs in Tazhong area.The corresponding relationship between the location of venting leakage or overflow and the beadlike reflection phase shown in the actual drilled reservoir is complex,and the design of drilling trajectory is very ambiguous.In this paper,the beadlike reflection characteristic types of fractured caves and their combinations in Tazhong area are analyzed and summarized.The fractured caves with different factors such as vertical and horizontal scale,filling speed,shape and spatial combination mode are designed.The corresponding relationship between the leakage position of drilling venting and the beadlike reflection characteristic types and reflection phases is clarified based on modeling of wave equation and analysis of seismic reflection.It is pointed out that near the zero phase between the strong trough and peak of its beadlike reflection is most likely the development position of a single karst cave,or the combined center of multiple vertical and horizontal karst caves biased towards the position of the karst cave with the lowest velocity.
作者
沈春光
桂文杰
丁肇媛
吴江勇
程钊
敬兵
顾汉明
Shen Chunguang;Gui Wenjie;Ding Zhaoyuan;Wu Jiangyong;Cheng Zhao;Jing Bing;Gu Hanming(Tarim Oilfield Company of PetroChina,Korla Xinjiang 841000,China;State Energy Key Laboratory of Carbonate Oil and Gas,Korla Xinjiang 841000,China;Key Laboratory of Carbonate,CNPC,Korla Xinjiang 841000,China;Institute of Geophysics and Geomatics,China University of Geosciences,Wuhan Hubei 430074,China)
出处
《工程地球物理学报》
2024年第3期403-415,共13页
Chinese Journal of Engineering Geophysics
基金
国家自然科学基金(编号:41974154)。
关键词
串珠状反射
缝洞体要素
正演模拟
钻井轨迹设计
beadlike reflection
elements of fracture-cave
forward modelling
drilling trajectory design
