莺歌海盆地高温高压复杂气藏高精度储层预测及含气性识别  

High precision prediction and identification of high temperature and high pressure gas reservoir in Yinggehai Basin

作　　者：刘巍 李雷 马光克 LIU Wei;LI Lei;MA Guangke(CNOOC China Limited,Zhanjiang Branch,Zhanjiang,Guangdong 524023,China)

机构地区：[1]中海石油(中国)有限公司湛江分公司研究院,广东湛江524023

出　　处：《石油地球物理勘探》2020年第S01期64-71,7,共9页Oil Geophysical Prospecting

摘　　要：莺歌海盆地高温高压气藏储层为非典型重力流沉积体系,非均质性强,砂体叠置关系复杂。受上覆浅层气及泥底辟微裂隙影响,地震资料信噪比和分辨率低,存在地震成像模糊区,地震响应多解性强,无法准确区分气层与水层,严重影响气田储层预测和含气性评价精度。为此,以莺歌海盆地东方D气田中深层黄流组为例,提出了一套高温高压复杂气藏储层预测及含气性识别技术:首先通过高密度地震采集获得高品质原始资料,开展针对性地震振幅补偿处理,改善地震模糊区成像效果;在此基础上,开展宽频地质统计学反演,提高储层预测精度;同时应用分频调谐含气性预测技术,有效识别研究区含气范围,最终达到高温高压复杂气藏储层高精度预测及含气性识别的目的。The high temperature and high pressure gas reservoir in the Yinggehai Basin is an unclassical system of gravity flow deposits where the reservoir is very heterogenous,the contact between sand bodies is very complicated.Affected by shallow gas and diaper microfissures,the seismic resolution and SNR are low.There are fuzzy zones,and it is difficult to accurately distinguish the gas and water layers.The multiplicity of seismic attributes are not conducive to high precision reservoir and hydrocarbon identification.Taking the Huangliu formation in the Dongfang D gasfield as a case,a high precision reservoir and hydrocarbon identification technology for high temperature and high pressure complex gas reservoir is proposed.First,obtain high quality seismic data by high density seismic acquisition,then conduct seismic amplitude compensation and broadband geostatistical inversion by combining geostatistical inversion and broadband inversion,and finally identify the gas range by frequency tuning decomposition.The study result is useful for high precision reservoir and hydrocarbon identification at high temperature and high pressure conditions.

关 键 词：高温高压 复杂气藏 高密度地震 振幅补偿 储层预测 含气性识别 

分 类 号：P618.13[天文地球—矿床学] P631.4[天文地球—地质学]