基于波形差异性的缝洞体内部结构预测方法  

Prediction method of internal structure of fracture-vuggy body based on waveform difference

作　　者：杨赟昊 朱博华 冉琦 李晶晶 卢志强 常健强 张胜寒 梁舒瑗 赵军 YANG Yunhao;ZHU Bohua;RAN Qi;LI Jingjing;LU Zhiqiang;CHANG Jianqiang;ZHANG Shenghan;LIANG Shuyuan;ZHAO Jun(Geophysical Research Institute Co.,Ltd.,SINOPEC,Nanjing 211103,China;School of Ocean and Earth Science,Tongji University,Shanghai 200092,China;Research Institute of Exploration and Development,Northwest Oilfield Company,SINOPEC,Urumqi 830011,China)

机构地区：[1]中石化石油物探技术研究院有限公司,江苏南京211103 [2]同济大学海洋与地球科学学院,上海200092 [3]中国石化西北油田分公司勘探开发研究院,新疆乌鲁木齐830011

出　　处：《断块油气田》2025年第1期102-107,共6页Fault-Block Oil & Gas Field

基　　金：中国石化科技部项目“顺北深层断溶体油藏描述及可采储量定量表征”(P21064-1)。

摘　　要：碳酸盐岩缝洞体油气藏内部结构的精细描述是该类储集体高效井位部署和效益开发的关键技术之一。研究区缝洞体地震响应为串珠状,内部多为小尺度栅状结构,横向上具有分隔性。文中基于波形差异,改进了互相关相干算法的地震道组合方式,减小横向分析窗口,进行缝洞体内部结构分析;设计理论模型进行正演模拟并偏移成像,揭示小尺度缝洞储集体内部栅状结构地震响应特征;统计研究区实钻井储层段,并与预测结果进行吻合度比对;减小地震资料处理面元,预测的串珠状缝洞体内部栅状结构有效刻画储层段和边界;在井轨迹上标定储层段,进行三维刻画,吻合精度较高。研究结果表明,相较于常规地震资料,显著提高预测精度,降低了地震资料解释的多解性。这一方法为有利油气靶区优选和井轨迹设计优化工作提供了可靠的地震解释依据。Fine characterization of the internal structure of carbonate fracture-vuggy reservoirs is one of the key technologies for efficient well location deployment and profitable development of such reservoirs.The seismic response of fracture-vuggy body in the study area is bead-shaped,and the interior is mostly small scale grid structure,which is separated laterally.In this paper,based on waveform difference,the seismic trace combination method of cross-correlation coherence algorithm is improved,the lateral analysis window is reduced,and the internal structure of the fracture-vuggy body is analyzed.A theoretical model is designed for forward simulation and migration imaging to reveal the seismic response characteristics of the grid structure in the small scale fracture-vuggy reservoir.The actual drilling reservoir segments in the study area were counted and the coincidence was compared with the predicted results.With the reduction of seismic data processing surface elements,the predicted grid structure inside the beaded fracture-vuggy body can effectively characterize the reservoir segments and boundaries.The reservoir segment is demarcated on the well trajectory and three-dimensional characterization is carried out with high accuracy.The results show that,compared with conventional seismic data,the prediction accuracy is significantly improved,and the non-uniqueness of seismic data interpretation are reduced.This method provides a reliable seismic interpretation basis for the optimization of favorable oil and gas target area and well trajectory design.

关 键 词：互相关相干算法 缝洞体油气藏 栅状结构 塔里木盆地 

分 类 号：TE132.1[石油与天然气工程—油气勘探]