莺歌海盆地东方区中新统黄流组一段高精度层序地层特征与隐蔽油气藏预测

发布时间：2018-08-17 17:33

【摘要】：莺歌海盆地东方区中深层高温高压领域是近年来油气勘探的热点,并在黄流组一段取得了领域性突破,但对其高精度层序地层特征、储层沉积微相与演化、圈闭特征尚有待系统查明。综合利用岩心、钻井、测井以及三维地震数据,构建了东方区黄流组一段高精度层序地层格架,查明了各高频层序单元内沉积微相类型、特征及时空配置,揭示了有利储层特征、隐蔽圈闭类型及分布,探讨了该区油气勘探方向。黄流组一段层序可细分为5个准层序组单元,从下到上依次为Ps1、Ps2、Ps3、Ps4和Ps5;其中Ps1、Ps2和Ps3位于低位体系域,Ps4和Ps5分别对应海侵体系域和高位体系域。低位体系域主要发育浅海浊积扇和浅海相,其中浅海浊积扇系低位扇,由中扇和外扇亚相构成,并以中扇为主体,包括浊积水道、水道间漫溢沉积和天然堤3种微相;海侵体系域与高位体系域均以浅海砂坝和陆架泥为主。浊积水道砂岩为该区最主要的储集体类型,低位体系域为最重要的勘探层位。在底辟构造带内主要发育构造岩性复合油气藏,在底辟构造带翼部发育砂岩上倾尖灭型岩性油气藏,在东方区西侧非底辟构造带则以砂岩透镜体岩性油气藏为主。
[Abstract]:The mid-deep high temperature and high pressure field in the eastern area of Yinggehai Basin is a hot spot in oil and gas exploration in recent years, and a breakthrough has been made in the first section of the Huangliu formation. However, the high-precision sequence stratigraphic characteristics, sedimentary microfacies and evolution of the reservoir have been obtained. The characteristics of traps need to be systematically investigated. Based on the core, drilling, logging and 3D seismic data, the high-precision sequence stratigraphic framework of the first section of the Huangliu formation in the eastern region is constructed, and the types, characteristics and space-time disposition of sedimentary microfacies in each high-frequency sequence unit are identified. The characteristics of favorable reservoir, the types and distribution of subtle traps are revealed, and the exploration direction of oil and gas in this area is discussed. The first member of the Huangyu formation can be subdivided into five quasequence units, and from the bottom to the top are Ps1, Ps2, Ps3, Ps4 and Ps5, in which Ps1, Ps2 and Ps3 are located in the lowstand system tract, Ps4 and Ps5, respectively, corresponding to the transgressive system tract and the high system tract, respectively. The lowstand system tracts mainly develop shallow sea turbidite fan and shallow sea facies, among which the shallow sea turbidite fan system is composed of middle fan and outer fan subfacies, with middle fan as main body, including turbidite channel, overflowing deposit between waterways and natural embankment. Transgressive system tracts and high system tracts are dominated by shallow sand dams and shelf mud. The turbidite channel sandstone is the most important reservoir type in this area, and the low system tract is the most important exploration horizon. In the diapir structural belt, the lithologic complex reservoirs are mainly developed, the sandstone updip dip-out lithologic reservoirs are developed in the wing of the diapir structural belt, and the sandstone lenticular lithologic reservoirs dominate in the non-diapir structural zones in the west of the eastern region.
【作者单位】：中海石油北京研究中心;中国地质大学(武汉)资源学院;广州海洋地质调查局;
【基金】：国家自然科学基金(编号:41472084) 国家“十三五”科技重大专项(编号:2016ZX05026)联合资助
【分类号】：P618.13;P539.2

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