基于地震波形分类的三角洲储层刻画与应用——以西湖凹陷J气田为例  

Depiction and Application of Delta Reservoir Based on Seismic Waveform Classification:A Case Study of J Gas Field in Xihu Sag

作　　者：黎祺 陆嫣 何贤科 段冬平 马恋 胡伟 LI Qi;LU Yan;HE Xian-ke;DUAN Dong-ping;MA Lian;HU Wei(Shanghai Company of CNOOC Co., Ltd., Shanghai 200020, China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200020

出　　处：《科学技术与工程》2022年第17期6847-6856,共10页Science Technology and Engineering

基　　金：国家科技重大专项(2016ZX05027-004);中海油七年行动计划科技项目(CNOOC-KJ-135-ZDXM-39-SH01)。

摘　　要：西湖凹陷J气田是东海主要产量贡献的油气田之一,随着开发生产的深入,主力气井E开始见水,逐渐停产,对气田油气产量带来了较大影响,急需对储层展布范围及水体能量进行分析。以精细岩心观察描述为基础,根据岩石类型、沉积构造、沉积旋回及测录井资料,对研究区内平湖组沉积环境及相类型进行了分析,在此基础上对研究区主力层P7开展了基于地震波形分类的精细地震解释,识别并统计了3类地震波形分类标志,通过地震正演技术,初步验证了解释成果的可靠性;结合现代沉积模式,对P7层储层平面展布进行了刻画。研究表明:研究区主要发育3个三角洲朵叶体,据此计算P7气藏的水体倍数约20倍,主要来水方向为北偏东方向,更新后的油藏数值拟合效果较好,对研究区出水井治理及挖潜具有重要指导意义。J gas field of Xihu Sag is one of the major production contribution fields in the East China Sea.With the further development and production,the main gas well E began to produce water and gradually stopped production,which had a great impact on the oil and gas production in the gas field.It is urgent to analyze reservoir distribution and water energy.Based on the core observation description,the sedimentary environment and facies of Pinghu Formation in the study area were analyzed according to the rock types,sedimentary structures,sedimentary cycles and logging data.On this basis,seismic interpretation based on seismic waveform classification was carried out for the main layer P7,and three types of seismic waveform classification signs were identified and counted.According to seismic forward modeling,the reliability of interpretation results was preliminary verified.Combined with modern sedimentary model,the reservoir distribution of P7 was depicted.The results show that there are three delta lobes in the study area.Accordingly,the water multiple of P7 gas reservoir is about 20 times,and the main inflow direction is north to east,and the updated reservoir numerical effect is well fitted,which has important guiding significance for the treatment of well extraction and potential exploitation.

关 键 词：西湖凹陷 波形结构 储层预测 正演模拟 平湖组 

分 类 号：P588.2[天文地球—岩石学]