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首页> 外文期刊>Journal of African Earth Sciences >Hydrocarbon leads and prospects opportunities across a cluster of fields in parts of Onshore Niger Delta Basin
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Hydrocarbon leads and prospects opportunities across a cluster of fields in parts of Onshore Niger Delta Basin

机译：尼日尔三角洲陆上盆地部分地区的整个油田群中的碳氢化合物线索和勘探机会

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摘要

The increase in oil and gas production over the years from already discovered fields at relatively shallower intervals, and corresponding decrease in the discovery of new fields has led to observable decline in the available hydrocarbon reserves within the Niger Delta Basin of Nigeria. Therefore, there is need to grow or add to the existing reserves through "searching wider and drilling deeper" across the onshore sector of the Niger Delta Basin, which is the focus of this work. Although, there has been several hydrocarbon prospectivity studies in the Onshore Niger Delta Basin, most of these studies were conducted on individual fields, except where adjacent fields belonged to the same operator. This has provided limited information on stratigraphic intervals, structural features and reservoir zones continuity across several fields. This study is aimed at interpreting recently acquired within the Coastal Swamp Depobelt of the Niger Delta, long-cable regional 3D seismic data over nine producing fields, and data from twenty-five wells, using sequence stratigraphic, structural and reservoir exploration tools, thus providing a regional scale interpretation and information that will unravel new prospective zones across these fields primarily based on amplitude supported structural plays. Results from stratigraphic studies, show the occurrence of regional extensive chrono/sequence stratigraphic surfaces such as maximum flooding surfaces (7.4-12.8 Ma) and sequence boundaries (8.5-13.1 Ma) that depict sediment packages deposited during the Middle-Miocene through Upper Miocene age. Well log sequence stratigraphic and reservoir correlation studies reveal that depositional sequences, bounded by these surfaces, comprise reservoir and non-reservoir packages within their systems tracts. Reservoir architectural studies show sands of lowstand, transgressive, and highstand systems tracts that make up the reservoir units, are relatively thick, laterally continuous and quite extensive across the area. Interpreted seismic sections unravelled the influence of structure on stratigraphy as sediment packages show variable thicknesses across faults. This was linked to syndepositional deformation associated with sediment deposition within the basin. Mapped reservoir tops at intermediate and deeper intervals reveal the dominance of fault-dependent closures. In addition, root mean square amplitude extraction done on these maps, unravelled eight structurally controlled regional hydrocarbon prospects and eight leads with booming amplitude responses that are conformable to structures. Overall, this study has shown that there exist hydrocarbon prospective zones that cut across several fields at deeper depths that are yet to be drilled, which could contribute to the Niger Delta Basin's existing reserve base.
机译：多年来，已经发现的油田以相对较浅的间隔增加了石油和天然气产量，而新油田的发现相应减少，导致了尼日利亚尼日尔三角洲盆地内可利用的碳氢化合物储量明显下降。因此，有必要通过在尼日尔三角洲盆地陆上部分进行“更广泛的探索和更深的钻探”来增加或增加现有的储量，这是这项工作的重点。尽管在尼日尔三角洲陆上盆地进行了几次油气远景研究，但大多数研究是在单个油田上进行的，除非相邻油田属于同一作业者。这提供了有关几个油田的地层间隔，结构特征和储层连续性的有限信息。这项研究的目的是使用层序地层，结构和储层勘探工具解释最近在尼日尔三角洲的海岸沼泽Depobelt内采集的，在9个生产区的长电缆区域3D地震数据以及来自25口井的数据，从而提供区域尺度的解释和信息，这些信息将主要基于振幅支持的构造层层展开这些领域中的新预期带。地层学研究的结果表明，出现了区域性广泛的时间/层序地层表面，例如最大洪泛面（7.4-12.8 Ma）和层序边界（8.5-13.1 Ma），它们描述了中中新世至上中新世时期沉积物包裹。测井序列地层学和储层相关性研究表明，受这些表面限制的沉积层序在其系统区域内包括储层和非储层组合。水库建筑研究表明，构成水库单元的低水位，海侵和高水位系统段的沙子相对较厚，横向连续且在整个区域内分布广泛。解释性地震剖面揭示了构造对地层的影响，因为沉积物包裹显示出跨断层的厚度变化。这与与盆地内沉积物沉积有关的同沉积变形有关。在中间和更深的层段上绘制的储层顶部显示出与断层有关的闭合带的优势。此外，在这些地图上进行的均方根振幅提取，揭示了八个结构受控的区域油气远景和八个具有与结构相符的振幅响应迅速的导联。总体而言，这项研究表明，存在油气勘探区，这些油气勘探区跨越了几个尚待钻探的更深深度的油田，这可能有助于尼日尔三角洲盆地现有的储量基础。

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