西湖凹陷平北斜坡带隐蔽圈闭地球物理识别技术  

Geophysical identification techniques ofsubtle reservoirs in Pingbei slope belt of Xihu Sag

作　　者：刘春锋 邹玮 唐健程 周平 熊志武 LIU Chunfeng;ZOU Wei;TANG Jiancheng;ZHOU Ping;XIONG Zhiwu(Shanghai Company,CNOOC(China)Co.,Ltd.,Shanghai 200335,China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《石油地质与工程》2023年第6期1-7,14,共8页Petroleum Geology and Engineering

摘　　要：平北斜坡带成藏条件优越,不同圈闭类型的大中型油气田成群成带分布,是西湖凹陷近年来的主要勘探区域,但随着地质认识进步和勘探程度推进,平北斜坡带传统的构造、岩性圈闭勘探已步入中后期,亟需寻找新的勘探领域。基于平北斜坡带西高东低斜坡和洼隆相间的平面构造特征,结合区内碎屑岩地层和火山岩共生的沉积充填背景,以隐蔽圈闭评价为着眼点,通过构造、沉积、地震综合分析,认为平北斜坡带还发育地层岩性圈闭、古潜山圈闭、火山岩圈闭等三种隐蔽圈闭。根据区内不同隐蔽圈闭地球物理响应特征,建立了不同隐蔽圈闭的地球物理识别技术。其中,不同频率的频谱分解技术可以有效识别具体的地层尖灭点,进而有效实现地层岩性圈闭的识别;振幅/频率属性体可有效识别风化淋滤带,蚂蚁体裂缝识别技术可有效识别裂缝发育位置,从而实现古潜山圈闭的识别;多Z值解释技术和三维体雕刻岩性储层识别技术可有效识别火山岩圈闭。以上识别技术在应用中取得了良好的评价效果,可为平北斜坡带隐蔽圈闭勘探提供较好的技术指导。With superior reservoir forming conditions,large and medium-sized oil and gas fields of different trap types in Pingbei slope belt are distributed in groups and belts,which is the main exploration area of Xihu Sag in recent years.However,with the improvement of geological understanding and exploration degree,the exploration of traditional structural and lithologic reservoirs has entered the middle and late stage and it’s urgent to find new exploration areas.Based on structural patterns of alternating depression and uplifts with high west and low east of Pingbei slope in the plane view,combined with the sedimentary filling background of clastic rocks in symbiosis with volcanic rocks in this area,focusing on the evaluation of subtle traps,through comprehensive analysis of structure,sedimentation and seismic,it is believed that the Pingbei slope belt also develops three types of subtle traps,including stratigraphic-lithologic traps,buried hill traps,and volcanic traps.In view of the geophysical response characteristics of different subtle traps,different geophysical identification techniques have been established.Spectral decomposition technique with different frequencies can identify specific stratigraphic pinch points,thereby effectively identifying stratigraphic-lithological traps.Amplitude/frequency attribute volume can identify weathering leaching zones.Ant body crack identification technology can identify the location of crack development,thus achieving the identification of paleo-buried hill traps.The above techniques have achieved good evaluation in application,and can provide a good technical guidance for subtle traps exploration in Pingbei slope belt.

关 键 词：平北斜坡带 隐蔽圈闭 地层圈闭 潜山 圈闭评价技术 

分 类 号：P618.13[天文地球—矿床学]