东方B气田海底扇复杂砂体地震刻画

Seismic characterization of complex sand bodies of submarine fan in the Dongfang B gas field

晁彩霞,于俊峰,胡胜辉,杨丽,陈之贺

中海石油（中国）有限公司海南分公司，海南 海口 570312 2．广东石油化工学院，广东 茂名 525000

Hainan Branch of CNOOC Ltd., Haikou 570312, China Guangdong University of Petrochemical Technology, Maoming 525000, China

莺歌海盆地东方B气田黄流组一段为浅海重力流海底扇沉积，主要发育侵蚀水道、分流水道、水道侧缘及朵体等沉积微相。目前，对F8d井区黄流组一段沉积微相的认识存在争议，为此，文中在地震相分析的基础上，利用正反演技术，明确了该区为侵蚀水道沉积微相；同时，利用全局优化属性分析结合地震波形特征刻画了复合侵蚀水道砂体边界。在复合侵蚀水道砂体内部，利用地震相、全局优化属性切片，厘清了厚度大的单一水道砂体的沉积期次、叠置样式及平面展布范围，并运用高分辨率波形指示反演技术，预测了薄储层单一水道砂体叠置样式。预测结果表明，F8d井区为3期侧向迁移侵蚀水道沉积。该研究成果为后期开发调整井部署及挖潜提供了依据。

The first member of Huangliu Formation of Dongfang B gas field in Yinggehai basin is a shallow sea gravity flow submarine fan deposit, which mainly develops sedimentary microfacies such as erosion channel, distributary channel, channel side edge and flower body. At present, the understanding on sedimentary microfacies of the first member of Huangliu Formation in F8d well area is controversial. Therefore, on the basis of seismic facies analysis, combined with forward and inversion technology, it is clear that the area is eroded channel deposition. Through the global optimization attribute analysis, combined with the characteristics of seismic waveform, the sand body boundary of composite erosion channel is characterized. Within the complex erosion channel sand body, the sedimentary period, superposition style and plane distribution range of single channel sand body with large thickness are clarified through seismic facies and global optimization attribute slice. High resolution waveform indication inversion is used to predict the superposition style of single channel sand body in thin reservoir. The results show that F8d well area is deposited by three-stage lateral migration erosion channels. The research results provide a basis for the deployment of development adjustment wells and potential tapping in the later stage.

10.6056/dkyqt202201011