莺歌海盆地东方区黄流组一段小层划分及海底扇沉积演化主控因素  

Subdivision of the first member of Huangliu Formation in Dongfang area of Yinggehai Basin and the main factors controlling the sedimentary evolution of submarine fan

作　　者：杨朝强 周伟 王玉 彭旋 莫冯阳 刘圣乾 李华[2] 何幼斌[2] YANG Zhaoqiang;ZHOU Wei;WANG Yu;PENG Xuan;MO Fengyang;LIU Shengqian;LI Hua;HE Youbin(Hainan Branch, CNOOC China Limited, Haikou, Hainan 570312, China;School of Geosciences, Yangtze University, Wuhan, Hubei 430100, China)

机构地区：[1]中海石油(中国)有限公司海南分公司,海南海口570312 [2]长江大学地球科学学院,湖北武汉430100

出　　处：《中国海上油气》2022年第1期55-65,共11页China Offshore Oil and Gas

基　　金：湖北省自然科学基金“深水重力流水道沉积类型及形成机理研究(编号:2020CFB745)”;地质资源与地质工程一流学科开放基金项目“深水重力流水道形成机理研究(编号:2019KFJJ0818010)”部分研究成果。

摘　　要：莺歌海盆地东方区黄流组一段发育浅海陆架背景下的海底扇沉积,频繁的沉积及改造作用使得扇体内部小层难以对比,沉积微相平面展布复杂。基于岩心、测录井及三维地震资料,结合测井INPEFA分析技术,对海底扇砂体进行了小层划分,综合波阻抗岩性反演结果,对海底扇砂体沉积微相及演化进行了精细刻画。结果表明:东方区黄流组一段II气组自下而上可分为IIb-1、IIb-2和IIb-3三个小层,主要发育海底扇相中扇的水道(带)、堤岸、席状砂三种沉积微相。在构造背景及物源供给相对稳定的条件下,海底扇沉积作用主要受控于微观古地貌。通过对IIb扇体的沉积古地貌分析,识别出限制型侵蚀-充填-溢出和非限制型漫流两种沉积模式,认为微古地貌控制了沉积中心、沉积物搬运路径、海底扇沉积微相展布及沉积演化。该研究成果可用于精细储层预测,并指导后期钻井的部署与勘探开发。The first member of Huangliu Formation in Dongfang area of Yinggehai Basin has developed with submarine fan depositions under the backdrop of shallow water continental shelf.Frequent sedimentation and modification brought difficulties in sublayer correlation of the fan body,and the plane distribution of sedimentary microfacies is complex.Based on the core,logging and 3D seismic data,combined with INPEFA technique,the sublayers of the submarine fan sand body are divided,and then the acoustic impedance lithology inversion results are integrated to finely characterize the sedimentary microfacies and the evolution of the submarine fan sandbody.The results show that the gas layer II of the first member of Huangliu Formation in Dongfang area can be divided into three sublayers of IIb-1,IIb-2 and IIb-3 from bottom to top.There are mainly three sedimentary microfacies of water channel,levee and sheet sand in the middle fan of submarine fan facies.Under the condition of relatively stable tectonic backdrop and provenance supply,the sedimentation of submarine fan is mainly controlled by micro-paleomorphology.Based on the analysis of sedimentary paleogeomorphology of Fan IIb,two sedimentary modes of restricted scour-filling-overflow and unrestricted overflow are identified.It is considered that the micro-paleogeomorphology controls the sedimentary center,sediment transport passage,sedimentary microfacies distribution and sedimentary evolution of submarine fan.The study results can be used for fine reservoir prediction and guidance of the well deployment and development.

关 键 词：莺歌海盆地 黄流组 小层对比 海底扇 沉积演化 古地貌 

分 类 号：TE121.3[石油与天然气工程—油气勘探]