南海深水中央峡谷下切水道识别及对储层非均质性影响  

Identification of undercut channel in deep water central Canyon of South China Sea and its influence on reservoir heterogeneity

作　　者：刘巍 胡林 廖仪 王玲玲 贾曙光 吴为正 LIU Wei;HU Lin;LIAO Yi;WANG Lingling;JIA Shuguang;WU Weizheng(Research Institute of Hainan Company,CNOOC(China)Co.,Ltd.,Haikou,Hainan 570100,China;Beijing Jinhai Nengda Science&Technology Co.,Ltd.,Beijing 102299,China)

机构地区：[1]中海石油(中国)有限公司海南分公司研究院,海南海口570100 [2]北京金海能达科技有限公司,北京102299

出　　处：《石油地质与工程》2022年第2期54-61,共8页Petroleum Geology and Engineering

摘　　要：琼东南盆地以多期次复合水道砂体为主要储集类形,后期泥质下切水道侵蚀储层,控制着砂体圈闭发育位置和规模,影响着储层平面非均质性。结合正演模拟方法,从波组剖面和地貌平面特征识别下切水道,并从储层砂体之间的接触关系和连通性分析下切水道对储层平面非均质性的影响。研究表明,下切水道在剖面上出现“U”形或“V”形边界和内部弱振幅波谷特征;融合相干属性、波阻抗和孔隙度反演解释了泥质下切水道平面“树枝状”展布规律。多属性分析表明,W1井区周边储层砂体分布稳定、厚度大、均质性强,是主力含气区。W5井区东北部存在多条水道分支,属性特征变化快、分割性强、非均质性强。The multi-stage composite channel sand body is the main reservoir type in Qiongdongnan basin.In the later stage,the argillaceous undercut channel erodes the reservoir,controls the development position and scale of sand body traps,and affects the plane heterogeneity of the reservoir.Combined with the forward simulation,the undercut channel is identified from the wave group profile and geomorphic plane characteristics,and the influence of the undercut channel on the reservoir plane heterogeneity is analyzed from the two aspects of contact relationship and connectivity between reservoir sand bodies.The research results show that the undercut channel has the characteristics of"U"or"V"boundary and internal weak amplitude trough on the profile.Integrating coherence attribute,wave impedance and porosity inversion,the plane"dendritic"distribution law of argillaceous undercut channel is explained.Multi attribute analysis shows that the reservoir sand body around W1 well block is the main gas bearing area with stable distribution,large thickness and strong homogeneity.There are several water-channel branches in the northeast of W5 well block,with fast change of attribute characteristics,obvious segmentation and strong heterogeneity.

关 键 词：琼东南盆地 下切水道 平面非均质性 正演模拟 纵波阻抗反演 

分 类 号：TE121[石油与天然气工程—油气勘探]