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Reflection seismic interpretation of deepwater fold-thrust structures, Niger Delta.

机译：尼日尔三角洲深水褶皱-冲断构造的反射地震解释。

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摘要

Structural and stratigraphic interpretation of 2D and 3D seismic data sets across the zone of compression referred to as the eastern fold-thrust belt (EFTB) suggests that the EFTB is characterized by a regional imbricate fan-thrust system and fault propagated folds. The imbricate fan-thrust system is subdivided into three distinct imbricate fan-thrust subsystems.; The EFTB is interpreted to be the compressional downdip part of an active deformation cell. This deformation cell is characterized by an up-dip area of extensional deformation, a translational middle area, and a down-dip area of compressional deformation (FTBs). An estimated 26% shortening is accommodated by these thrust and fold structures. It is anticipated that the amount of extension updip, which is the focus of future studies, will approximately equal to the estimated amount of compression within the EFTB.; Seismic facies analysis of one of the thrust blocks within the EFTB reveals the existence of alternating depth intervals of high and low amplitude seismic event packages. These are interpreted as channel-levee systems alternating with thin shale drapes (beds). They represent confined gravity flow subsystems within basin floor fan complex. The seismic facies at deeper stratigraphic levels are interpreted as unconfined gravity flows also part of the basin floor fan complex.; In terms of prospective hydrocarbon traps, both structural and stratigraphic traps could exist. The structural traps will probably include simple four-way dip closures (anticlinal folds) or thrust fault-assisted closures. Estimated shale gouge ratio (SGR) across the thrust plane ranges between 10% and 50%. Areas of 20% SGR and above have a high probability of sealing and trapping hydrocarbon. The existence of a deformed thrust plane zone however introduces a risk factor to these prospective thrust assisted closures. Channel-levee systems of deepwater environments proximal to the EFTB, or other basins analogous to the Niger Delta, are associated with prolific hydrocarbon fields. It is therefore probable that the interplay of sand and shale bodies within the interpreted multi-story channel-levee system will enhance chances that stratigraphic traps could significantly contribute to the hydrocarbon prospectivity in this fold-thrust belt.
机译：在被称为东部褶皱冲断带（EFTB）的压缩带中，对2D和3D地震数据集的结构和地层解释表明，该EFTB的特征是区域性的扇状扇冲冲系统和断层扩展褶皱。盘状扇形推力系统可细分为三个不同的盘状扇形推力子系统。 EFTB被解释为是主动变形单元的压缩下倾部分。该变形单元的特征在于延伸变形的上倾区域，平移中间区域和压缩变形（FTB）的下倾区域。这些推力和折叠结构估计可缩短26％。可以预料的是，延伸扩展量是未来研究的重点，大约等于EFTB内的压缩量。 EFTB内的一个逆冲块的地震相分析揭示了高振幅和低振幅地震事件组合的交替深度间隔的存在。这些被解释为与薄页岩悬垂物（床）交替的河道堤防系统。它们代表了盆底风机综合体内的受限重力流子系统。地层深处的地震相被解释为无约束重力流，也是盆地底板扇群的一部分。就潜在的油气圈闭而言，构造圈闭和地层圈闭均可存在。结构圈闭可能包括简单的四向倾角封闭（倾斜褶皱）或逆冲断层辅助封闭。推力平面上的估计泥浆比（SGR）在10％至5​​0％之间。 SGR大于或等于20％的区域极有可能封堵碳氢化合物。然而，变形的止推平面区域的存在为这些预期的止推辅助封闭件引入了危险因素。 EFTB附近的深水环境或类似尼日尔三角洲的其他盆地的河道堤坝系统与大量油气田有关。因此，解释的多层河道-堤坝系统中砂岩和页岩体的相互作用很可能会增加地层圈闭可能对这一褶皱-冲断带中的油气远景做出重大贡献的机会。

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  • 作者

    Akingbade, Atinuke Olubunmi.;

  • 作者单位

    University of Missouri - Rolla.;

  • 授予单位 University of Missouri - Rolla.;
  • 学科 Geophysics.; Geology.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 203 p.
  • 总页数 203
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地球物理学;地质学;
  • 关键词

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