Three-dimensional analyses of syndepositional faults and synkinematic sediments, Niger Delta, Nigeria

尼日利亚尼日尔三角洲同沉积断层和同运动沉积物的三维分析

• 批准号: 48759011
• 负责人: Privatdozent Dr. Stefan Back
• 金额: --
• 依托单位: Lehrstuhl für Geologie und Paläontologie (GIA)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/48759011?language=en
• 关键词: Three; dimensional; analyses; syndepositional; faults

Several important issues concerning the understanding of synsedimentary deltaic faulting and fault-controlled deltaic sedimentation are yet not fully understood, including 1) the explanation of the initiation, maintenance, and abandonment of deltaic faults, 2) the controlling mechanisms for the often diverse spatial and temporal development of synsedimentary faults (growth faults) in large deltas that is characterized either by fault propagation through time into hanging-wall terrain or by the backstepping of deltaic faults into footwall areas, and 3) the delineation of the parameters controlling the reactivation of deltaic faults. This study tackles the above issues by applying a detailed tectonic and seismicstratigraphic analysis to a large-scale, state-of-the-art industry dataset of the shallow-water offshore Niger Delta (3D seismic block, 129 wells) that will form the base for an incremental, quantitative restoration of the movement history associated with growth structures imaging at the same time the development of the subsurface stratigraphy in great detail. The results of this combined tectonic and sedimentological Niger-Delta research approach are expected to 1) comprise generally applicable, quantitative end-member models for the “life-cycle” of growth faults in large deltas, 2) describe and quantify the associated growth stratigraphy, and 3) increase the fundamental understanding of the influence (or dependence?) of synsedimentary faulting on delta sedimentation.

关于同沉积三角洲断裂和断层控制三角洲沉积作用的认识，有几个重要问题尚未完全弄清楚，包括：（1）三角洲断层的形成、维持和废弃的解释;（2）同沉积断裂在时间和空间上的多样性控制机制（生长断层）在大型三角洲中，其特征是断层随时间传播到上盘地形或三角洲断层后退到下盘区域，（3）控制三角洲断裂活动的参数的确定。本研究通过对近海尼日尔三角洲（3D地震区块，129口威尔斯井）的大规模、最先进的工业数据集进行详细的构造和地震地层分析，解决了上述问题，该数据集将为增量、定量恢复与生长构造成像相关的运动历史奠定基础，同时非常详细地开发地下地层。这种结合构造和沉积学的三角洲研究方法的结果，预计1）包括普遍适用的，定量的端员模型的“生命周期”的生长断层在大三角洲，2）描述和量化相关的生长地层，和3）增加的影响（或依赖？）同沉积断层作用对三角洲沉积的影响。