少井条件下深层单河道内部结构地震综合表征技术  

Seismic comprehensive characterization technology for internal structures of deep single channels with few wells

作　　者：王健伟[1] 雷蕾 孙莉[1] 刘梦颖[1] 吴文雯 刘舒 WANG Jianwei;LEI Lei;SUN Li;LIU Mengying;WU Wenwen;LIU Shu(Exploration and Development Research Institute,SINOPEC Shanghai Offshore Oil&Gas Company,Shanghai City,200120,China)

机构地区：[1]中国石化上海海洋油气分公司勘探开发研究院,上海200120

出　　处：《油气地质与采收率》2025年第2期72-80,共9页Petroleum Geology and Recovery Efficiency

基　　金：中国石油化工股份有限公司科技项目“西湖凹陷巨厚气藏描述及开发技术政策研究”(P23056)。

摘　　要：海上A气田花港组为大型复合河道沉积,河道横向迁移、纵向叠置,目的层埋深大、已钻井少、地震资料品质差,河道砂体地震识别难度大,难以满足开发精度需求。结合经典河道沉积样式及已钻井特征,利用正演模拟技术明确不同河道沉积样式地震响应。在此基础上利用地层切片技术刻画复合河道带,综合中小角度叠加数据体、大角度叠加数据体等精确追踪单河道边界,最后在河道内部优选泊松阻抗反演定量预测优势砂体,形成逐级约束的少井条件下深层单河道内部结构地震综合表征技术。根据表征结果在不同河道优势砂体部署调整井位4口,实钻证实不同河道均存在不同的气水界面,表明发育多条河道形成的岩性-构造气藏且具有不同的气水系统,证实了单河道刻画的可靠性。4口井投产后获得平均日产气量20×104m3/d的高产,进一步证实了优势砂体刻画的准确性。该方法有力支撑了A气田的开发调整,天然气地质储量及日产气量均实现突破。Huagang Formation in offshore A gas field is a large composite channel deposit with horizontal migration and vertical superposition of channels.The target layer has a large burial depth,few drilled wells,and poor-quality seismic data.It is difficult to identify the channel sand bodies based on seismic data,and the development accuracy requirements are not supported.Based on the classic channel deposit styles and the characteristics of drilled wells,the seismic responses of different channel deposit styles were clarified by forward modeling technology.On this basis,the composite channel zones were characterized by using strata slice technology,and single channel boundaries were accurately tracked by combining near-angle stacked data volume and far-angle stacked data volume.The Poisson impedance inversion was selected to predict the dominant sand bodies in channels quantitatively.Finally,the seismic comprehensive characterization technology was formed for the internal structures of deep single channels with few wells and stepwise constraints.Based on the characterization results,four wells were deployed in the dominant sand bodies of different channels.The actual drilling confirmed that there were different gas-water interfaces in different channels,indicating that lithologic-structural gas reservoirs formed by multiple channels were developed and have different gas-water systems,which confirmed the reliability of single channel characterization.All four wells have achieved an average high gas yield of 20×104 m3/d after production,which further confirmed the accuracy of dominant sand body characterization.This method strongly supports the development and adjustment of the gas field,and the geological reserves and daily gas production of natural gas have achieved breakthroughs.

关 键 词：地震响应特征 复合河道沉积 分角度叠加数据体 单河道识别 泊松阻抗反演 优势砂体定量预测 

分 类 号：TE122.2[石油与天然气工程—油气勘探]