摘要
研究区C油田位于东海西湖凹陷中央背斜带南部,主力产层为渐新统花港组H3碎屑岩储层。H3储层砂体横向迁移摆动频繁,垂向多期次叠加,沉积微相及展布规律认识不清。针对海上井资料少、地质特征复杂的特点,综合应用研究区岩心、测井、地震数据及实验室分析数据等相关资料,明确目的层相标志、微相类型,分析了东海西湖凹陷C油田H3沉积微相平面展布及纵向演化特征。研究结果表明本区发育浅水辫状河三角洲前缘亚相,发育水下分流河道、支流间湾微相,水下分流河道进一步细分为主水道、次级水道及水道边缘,其中主水道是本区有利相带,呈条带状分布为主,复合砂体内部连通性较差,开发中后期往往易形成剩余油富集区;水下分流河道末端多发育孤立型储层,砂体规模较小,与沟源断层搭接可形成向上倾方向尖灭的构造-岩性复合油气藏。该研究明确有利沉积相带与油气分布的关系,对本地区及其它地区调整井的部署具有重要的指导意义。
The C oilfield in the study area is located in the south of the central anticlinal belt of Xihu Depression,East China Sea.The H3 clastic rock reservoir of Huagang Formation in the C oilfield of Xihu Depression in East China Sea is the primary production layer.The sand body of the H3 reservoir has the characteristics of frequent lateral migration and swing,vertical stacking of multiple periods.The understanding of sedimentary microfacies and distribution patterns is relatively blind.Considering the characteristics of little offshore well data and complex geological features,by comprehensively utilizing relevant data such as cores,well logging,seismic data,and laboratory analysis in the study area,the target layer facies indicators and microfacies types were studied.The planar distribution and vertical evolution characteristics in H3 of C oilfield in Xihu Depression of East China Sea were analyzed.Research results suggested that the target area developed shallow braided river delta front subfacies,along with sedimentary microfacies such as underwater distributary channel and distributary bay.The underwater distributary channel can be further subdivided into main channel,secondary channel,and channel edge.Among them,the main channel is the favorable zone in this area,which mainly strip-like distributes,and the internal connectivity of the composite sand body is poor.So it is easy to form remaining oil rich area in the middle and late development stage.At the end of the underwater distributary channel,there are many isolated reservoirs with small sand bodies,which can form composite structure-lithology oil and gas reservoirs by overlapping with gully source fault on updip direction.Identifying the relationship between favorable sedimentary facies zones and oil-gas distribution is of great guiding significance for the deployment of adjustment wells in this and other areas.
作者
刘舒
左一苇
方沛杰
孙莉
阴国锋
徐晨
张彦霞
LIU Shu;ZUO Yiwei;FANG Peijie;SUN Li;YIN Guofeng;XU Chen;ZHANG Yanxia(SINOPEC Shanghai Offshore Oil&Gas Company,Shanghai 200120,China;Wuxi Research Institute of Petroleum Geology,SINOPEC,Wuxi Jiangsu 214126,China)
出处
《海洋石油》
CAS
2024年第2期7-14,共8页
Offshore Oil
关键词
东海西湖凹陷
花港组H3
浅水辫状河三角洲前缘
相标志
微相类型
主水道
Xihu Depression in East China Sea
H3 of Huagang Formation
shallow braided river delta front
facies marks
microfacies types
main channel
