石油勘探与开发 >

2020 , Vol. 47 >Issue 2: 297 - 308

DOI: https://doi.org/10.11698/PED.2020.02.08

油气勘探

孟加拉湾若开盆地D区块上新统异重流特征与沉积模式

  • 周立宏 ,
  • 孙志华 ,
  • 汤戈 ,
  • 肖敦清 ,
  • 蔡铮 ,
  • 王海强 ,
  • 苏俊青 ,
  • 滑双君 ,
  • 葛维 ,
  • 陈长伟
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  • 1. 中国石油大港油田公司,天津 300280;
    2. 中国石油天然气勘探开发公司,北京 100034
周立宏（1968-）,男,河北故城人,博士,中国石油大港油田公司教授级高级工程师,主要从事油气勘探开发科研与管理工作。地址：天津市滨海新区大港油田公司机关,邮政编码：300280。E-mail: zhoulh@petrochina.com.cn 联系作者简介：汤戈（1985-）,男,安徽阜阳人,硕士,中国石油大港油田公司勘探开发研究院高级工程师,主要从事沉积储集层研究与综合地质评价工作。地址：天津市滨海新区幸福路1278号,大港油田公司勘探开发研究院,邮政编码：300280。E-mail: tangge@petrochina.com.cn

收稿日期: 2019-05-23

  修回日期: 2020-02-26

  网络出版日期: 2020-03-21

基金资助

中国石油海外科技专项"缅甸若开盆地深水区域油气风险勘探"（CNODC/CAL/KJZX/2015-016）

收起

Pliocene hyperpycnal flow and its sedimentary pattern in D block of Rakhine Basin in Bay of Bengal

  • ZHOU Lihong ,
  • SUN Zhihua ,
  • TANG Ge ,
  • XIAO Dunqing ,
  • CAI Zheng ,
  • WANG Haiqiang ,
  • SU Junqing ,
  • HUA Shuangjun ,
  • GE Wei ,
  • CHEN Changwei
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  • 1. Dagang Oilfield Company, PetroChina, Tianjin 300280, China;
    2. China National Oil and Gas Exploration and Development Corporation, Beijing 100034, China

Received date: 2019-05-23

  Revised date: 2020-02-26

  Online published: 2020-03-21

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摘要

基于岩心、测井、分析化验及地震资料,以孟加拉湾若开盆地D区块为例,开展海相深水异重流特征及沉积模式分析,研究异重流储集砂体展布规律,提出异重流有利储集相带预测方法,建立异重流油气成藏模式,预测勘探潜力区带与井位目标。D区块上新统发育典型的异重流沉积：岩性组合为一套夹持于厚层海相泥岩中的中—细砂岩;岩心发育一系列成对出现的逆粒序与正粒序;测井曲线见底部渐变且齿化严重的箱形、钟形和舌形测井相;地震剖面可见明显多期深水水道,地层切片能识别出明显的高弯曲水道。单期异重流形成的沉积体发育侵蚀谷（供给水道）、水道复合体、分支水道、天然堤及无水道席状砂等5种微相类型,空间上具有多分支、多世代、多期次发育特征,形成了平面呈条带状分布、纵向叠置发育的优质储集砂体,储集体物性较好,其中水道复合体微相沉积砂岩厚度大、粒度粗、物性好,是最有利的勘探相带。基于异重流沉积模式指导,利用地震反射结构解析、频谱波形特征分析、切片与属性融合研究精细刻画水道复合体微相分布,结合构造特征分析,明确了有利钻探目标区带,有效指导了区块的勘探部署。图10表1参42

关键词： 孟加拉湾; 若开盆地; 上新统; 重力流; 异重流; 沉积模式; 储集层; 油气勘探

本文引用格式

周立宏 , 孙志华 , 汤戈 , 肖敦清 , 蔡铮 , 王海强 , 苏俊青 , 滑双君 , 葛维 , 陈长伟 . 孟加拉湾若开盆地D区块上新统异重流特征与沉积模式[J]. 石油勘探与开发, 2020 , 47(2) : 297 -308 . DOI: 10.11698/PED.2020.02.08

Abstract

Based on core, logging, lab test and seismic data, sedimentary characteristics and pattern of marine hyperpycnal flow, the distribution rules of hyperpycnal flow reservoir, prediction method of favorable hyperpycnal flow reservoir zones, hydrocarbon accumulation model in hyperpycnal flow reservoir in D block of Bay of Bengal were investigated, and the favorable exploration zone and well sites were predicted. Pliocene in D block has typical hyperpycnal flow sediment, which is a set of fine-medium sandstone held between thick layers of marine mudstone and features a series of reverse grading unit and normal grading unit pairs. The hyperpycnal flow sediment appears as heavily jagged box shape, bell shape and tongue shape facies on log curves with linear gradient, and corresponds to multiple phases of deep channels on the seismic section and high sinuous channel on stratal slices. The sedimentary bodies formed by a single phase hyperpycnal flow which include five types of microfacies, namely, supply channel (valley), channel complex, branch channel, levee and sheet sand. The hyperpycnal flow sediments appear in multiple branches, multiple generations and stages in space, forming high-quality reservoirs in strips on the plane and superposition vertically, with fairly good physical properties. The channel complex sandstone, with large thickness, coarse particle size and good physical properties, is the most favorable exploration facies. Based on the guidance of the sedimentary model, distribution of the channel complex microfacies was delineated in detail by seismic reflection structure analysis, spectrum waveform characteristic analysis, slice and attribute fusion, and combined with the structural feature analysis, the favorable drilling zone was sorted out, effectively guiding the exploration deployment of the block.

Key words： Bay of Bengal; Rakhine Basin; Pliocene; gravity flow; hyperpycnal flow; sedimentary pattern; reservoir; oil and gas exploration

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