岩性油气藏 ›› 2016, Vol. 28 ›› Issue (4): 67–77,94.doi: 10.3969/j.issn.1673-8926.2016.04.009

• 油气地质 • 上一篇    下一篇

珠江口盆地陆丰南地区文昌组层序地层及沉积体系研究

陈锋1,2,朱筱敏1,2,葛家旺1,2,黎明3,吴陈冰洁1,2   

  1. 1.中国石油大学(北京)油气资源与探测国家重点实验室,北京102249;2.中国石油大学(北京)地球科学学院,北京102249;3.中海石油(中国)有限公司深圳分公司研究院,广东深圳510240
  • 出版日期:2016-07-20 发布日期:2016-07-20
  • 第一作者:陈锋(1992-),男,中国石油大学(北京)在读硕士研究生,研究方向为沉积学与层序地层学。地址:(102249)北京市昌平区府学路18 号中国石油大学(北京)地球科学学院。E-mail:wuhancf@gmail.com
  • 通信作者: 朱筱敏(1960-),男,博士,教授,主要从事沉积、储层与层序地层学的教学和科研工作。E-mail:xmzhu@cup.edu.cn。
  • 基金资助:

    国家科技部油气重大专项“岩性地层油气藏沉积体系、储层形成机理与分布研究”(编号:2011ZX05001-002)与国家油气重大专项“海洋深水区油气勘探关键技术”(编号:2011ZX05025-005-02)联合资助

Sequence stratigraphy and depositional systems of Wenchang Formation in the southern Lufeng area, Pearl River Mouth Basin

Chen Feng 1,2,Zhu Xiaomin 1,2,Ge Jiawang 1,2,Li Ming 3,Wu Chenbingjie 1,2   

  1. 1. State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China;2. College of Geosciences,China University of Petroleum,Beijing 102249,China;3. Research Institute of Shenzhen Branch,CNOOC,Shenzhen,510240,Guangdong,China
  • Online:2016-07-20 Published:2016-07-20

摘要:

陆丰凹陷是一个已被证实的富生烃凹陷,目前钻井油气显示多集中于凹陷南部,其为当前珠江口盆地的重点研究地区。由于陆丰南地区文昌组沉积期构造活动复杂且钻井较少,研究区沉积特征及演化过程尚不清楚,制约了该区下一步的油气勘探。以沉积学与层序地层学原理为依据,综合应用岩心、录井、测井和地震等资料,对珠江口盆地陆丰南地区古近系文昌组进行了层序地层划分,建立了三维层序地层格架,并在层序地层格架内分析了沉积体系展布特征。根据各层序边界在地震、岩性和测井资料上的响应特征,认为陆丰南地区文昌组整体为一个二级层序,可划分为6 个三级层序,它们构成了湖盆从初始裂陷、强烈裂陷、弱裂陷、热坳陷的完整沉积充填与演化过程。在研究区识别出波状、亚平行或乱岗状地震相,平行、亚平行席状地震相,楔形杂乱充填地震相,帚状或楔形前积反射地震相,斜交型或S 型前积反射地震相和低幅丘形地震相,它们在垂向上具有关联性。研究区主要发育辫状河三角洲、近岸水下扇、扇三角洲、湖泊与浊积扇等沉积相类型,受控于湖盆演化的各个阶段,沉积体系在垂向上具有明显的旋回性特征。综合分析认为:SQ2 层序内辫状河三角洲前缘亚相为陆丰南地区勘探的有利相带,SQ3 和SQ4 层序内近岸水下扇、扇三角洲和浊积砂体均为潜在的勘探目标。

Abstract:

Lufeng Depression is a proven rich?hydrocarbon accumulation area in the Pearl River Mouth Basin. The drilling of oil and gas mainly focused on the Wenchang Formation in the southern Lufeng depression in the past years.Because of multiple tectonic movements and limited amounts of drilling wells, the evolution of depositional systems and favorable reservoirs distribution are unclear, which restricts further hydrocarbon exploration in Lufeng Depression. Under the guidance of sedimentology and sequence stratigraphy, the sequence stratigraphy framework and depositional systems were discussed based on the comprehensive analyses of core, logging and new acquired 3D seismic data.According to the characteristics of seismic reflection and wireline logging changes, the Wenchang Formation is a second?order sequence, and it can be subdivided into six third-order sequences, which represent a complete sedimentary filling process of the lacustrine basin including initial rifting, intensive rifting, weak rifting and thermal depression from bottom to top. According to seismic reflection characteristics, several types of seismic facies were recognized including subparallel-hummoky seismic facies, parallel-subparallel sheet-shaped seismic facies, wedge-chaotic infilling seismic facies, fastigiate or wedge progradational seismic facies, progradational seismic facies(oblique or sigmodial)and moundy seismic facies. The distribution of these seismic facies of Wenchang Formation is related in the vertical profile.Depositional systems composed of braided river delta, nearshore subaqueous fan, fan delta, lacustrine and turbidity fan are developed during the Wenchang depositional stage. Controlled by rifting stages, the depositional systems display obvious cycling characteristics vertically. This study points out that the braided river delta front sandstone in SQ2 would be the favorable exploration targets. The nearshore subaqueous fan, fan delta and turbidity fan in SQ3 and SQ4 are the potential exploration targets.

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