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周 超,张宁宁,曾倩,等. Tanganyika盆地南部地震相识别及沉积演化分析[J]. 科学技术与工程, 2020, 20(24): 9757-9763.
ZHOU Chao,Li Haowu,曾倩,et al.Seismic Facies Identification and Sedimentary Facies Analysisin South Tanganyika basin[J].Science Technology and Engineering,2020,20(24):9757-9763.
Tanganyika盆地南部地震相识别及沉积演化分析
Seismic Facies Identification and Sedimentary Facies Analysisin South Tanganyika basin
投稿时间:2019-08-23  修订日期:2020-05-31
DOI:
中文关键词:  Tanganyika盆地  地震层序 地震相  沉积演化
英文关键词:Tanganyika  Rift Basin  Seismic Sequence  Seismic Facies  Sedimentary Evolution
基金项目:“十三五”国家科技重大专项“全球油气资源评价与选区选带研究”(编号:2016ZX05029)
           
作者单位
周 超 中国地质大学(北京)
张宁宁 中国石油勘探开发研究院
曾倩 中国石油勘探开发研究院
孟德伟 中国石油勘探开发研究院
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中文摘要:
      东非裂谷系盆地近年来不断取得油气发现,Tanganyika盆地与已发现含油气盆地构造及沉积特征相似,具有较大的勘探潜力。本次研究根据地震反射界面接触关系及界面上下地震反射特征,识别出4个层序界面:T14、T12、T5、T2,相应地将盆地沉积地层划分为4个三级层序:SQ1-SQ4。在层序格架控制下,根据地震相外部反射形态及内部反射结构,识别出河道充填状、强振幅席状、弱振幅席状、楔状、透镜状、丘状、叠瓦状共7种地震相类型,反映河流、滨浅湖-深湖、深水等深流、扇三角洲等不同沉积体系。结果表明研究区SQ1层序时期,缓坡带孤立半地堑发育三角洲沉积,洼陷中心以滨浅湖-深湖相沉积为主;SQ2层序时期缓坡带作为统一的构造单元发育河流及三角洲沉积,洼陷中心以发育三角洲及浊流相沉积为特征;SQ3层序时期构造抬升,缓坡带发育大型曲流河沉积,洼陷中心三角洲及浊流沉积规模进一步扩大;SQ4层序时期裂陷进一步加剧,洼陷中心发育洼陷中心发育深水等深流沉积,边界断层陡坡带发育大规模扇三角洲及滑塌沉积。
英文摘要:
      Tanganyika Basin has a great exploration potential, because of the similarity of tectonic and sedimentary characters with those basins located in East Rife, which had many oil and gas discoveries in recent years. In this study, according to the seismic reflection characters and interface contact relationship, four reflectors were identified including T14, T12, T5 and T2, which correspond to four third-order sequences namely SQ1, SQ2, SQ3 and SQ4. Under the control of sequence framework and based on external and internal seismic reflections, seven types of seismic facies were identified, including Channel filling seismic face, strong amplitude sheet seismic face, weak amplitude sheet seismic face, wedge shapedSseismic face, lenticular shaped seismic face, mound-shaped seismic face and imbricate seismic face, which reflect river, shallow to deep lacustrine, contourite and fan delta sedimentary systems. The study results show that, during the sedimentary period of the SQ1, deltas were developed in the isolated half grabens on the gentle slope, and shallow-deep lacustrine deposits in the center of the sag; when the SQ2 deposited, fluvial and delta deposits were developed in the gentle slope zone as a unified tectonic unit, and delta and turbidite deposits in the center of the sag; during the depositionary period of the SQ3, as the structure uplifted, large meandering rivers appeared in the gentle slope zone, and delta and turbidite deposits further expanded in the center of the sag; and with the coming of the SQ4, active rifting made developed contourite in the center of the sag and large fan deltas and slump deposits in the steep slope of the boundary fault.
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