南海深水少井区浅层气储层地震预测技术及应用  

Seismic prediction and application of shallow gas reservoir in sparsely drilled deep water area of South China Sea

作　　者：宋鹏 李芳 孙万元 吴启斌 刘国昌[3] SONG Peng;LI Fang;SUN Wanyuan;WU Qibin;LIU Guochang(Hainan Branch Company,CNOOC,Haikou 570321,China;Hainan Energy Co.,Ltd.,CNOOC,Haikou 570312,China;College of Geophysics,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中海石油(中国)有限公司海南分公司,海口570321 [2]中海油海南能源有限公司,海口570312 [3]中国石油大学(北京)地球物理学院,北京102249

出　　处：《世界地质》2024年第4期526-540,共15页World Geology

基　　金：中海油科技项目(KJZH-2021-0002-00)。

摘　　要：为应对南海深水区浅层/超浅层气藏勘探中因测井资料匮乏且可靠性低而导致的岩石物理建模、地震识别及储层预测的难题,针对该区域的地质特点,笔者构建了疏松浅层岩石物理模型,建立了地震响应识别模板,提出了少井区地震反演低频模型的构建方法,有效获取了浅层储层弹性参数。利用岩石物理模板,科学预测了储层含气性。结果表明,南海深水区浅层气藏的纵波速度受含气饱和度显著影响,但饱和度超过10%后影响减弱。浅层气层的纵波阻抗和密度较低,低阻抗区域指示潜在气藏,但在饱和度预测时准确性有限,纵横波速度比识别游离气具有较好的效果。To solve the problems of petrophysical modeling,seismic recognition and reservoir prediction caused by the lack of well logging data and low reliability in exploration of shallow/ultra-shallow gas reservoirs in the deep water area of the South China Sea.According to the geological characteristics in this area,the authors constructed a loose shallow petrophysical model,established a seismic response recognition template,and proposed the construction method of a low-frequency seismic inversion model in sparsely drilled area.The elastic parameters of shallow reservoir were effectively obtained.Using the petrophysical template,the gas-bearing property of the reservoir was predicted scientifically.The results show that the P-wave velocity of shallow gas reservoirs in the deep water area of the South China Sea is significantly affected by the gas saturation,but the effect is weakened when the saturation exceeds 10%.The shallow gas layer has low P-wave impedance and density,and the low-impedance region indicates potential gas reservoir,but the accuracy is limited in saturation prediction,and velocity ratio of P-wave and S-wave is better than that of gas saturation identification.

关 键 词：浅层气 岩石物理建模 叠前同时反演 少井低频建模 地震响应 

分 类 号：P618.13[天文地球—矿床学]