Sequence stratigraphic and reservoir modeling of KOC Field onshore Niger Delta Basin: implication for mature oilfield revitalization

IF 3.6 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Marine and Petroleum Geology Pub Date : 2025-07-11 DOI:10.1016/j.marpetgeo.2025.107553

Amoke Aniebonam Ignatius , Ayonma Wilfred Mode , Ikechukwu Onyema Njoku , Eze Martins Okoro

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引用次数: 0

Abstract

Recently, the exploration focus in the onshore areas of the Niger Delta Basin has been targeted towards extending the economic viability of “shallow hanging” producing reservoir units whilst searching wider and deeper for new oil and gas pools beyond known depths. The need therefore arises to deploy improved technologies for accurate mapping of prospect opportunities located at intermediate and deeper intervals within the basin. In this study, integrated sequence stratigraphic and reservoir modeling of the KOC Field onshore Niger Delta Basin was carried out using well logs, 3D seismic, and biostratigraphic data to assess the hydrocarbon potentials and also uncover the reservoir geometry, stratigraphic configuration, and structural framework of the study area. Logging and biofacies information from seven (7) wells, as well as key stratal surfaces including three (3) sequence boundaries (SB) and three (3) maximum flooding surfaces (MFS) provided in Well 001 and Well 039, formed the basis for chronostratigraphic correlation across the field. Two genetic sequences bounded at the top and base by maximum flooding surfaces were mapped and designated as Genetic Sequence 1 (G_SEQ1) and Genetic Sequence 2 (G_SEQ2). Three main stacking patterns (progradational, retrogradational and aggradational) interpreted as Lowstand Systems Tract (LST), Highstand Systems Tract (HST) and Transgressive Systems Tract (TST) were delineated from each of the identified genetic sequences. Lithological correlation of the wells revealed two hydrocarbon-bearing sand units with good reservoir quality characteristics. These reservoirs designated as R12 Sand and R15 Sand belonged to the LST and TST of G_SEQ2, and were interpreted to be basin floor fans and channel fill complexes, deposited within the neritic to bathyal environments. 3D geological modelling of the reservoirs showed good structural closures with thick sedimentary packages, suggesting that they are good locations for hydrocarbon accumulation. The major faults constitute good reservoir seals due to stratigraphic juxtapositions that may have prevailed in the cause of the dip slip movement.

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尼日尔三角洲盆地陆上KOC油田层序地层与储层模拟：对成熟油田振兴的启示

最近，尼日尔三角洲盆地陆上区域的勘探重点是扩大“浅挂”生产储层单元的经济可行性，同时在已知深度之外寻找更广泛、更深的新油气藏。因此，有必要部署改进的技术，以便在盆地内的中深层段精确绘制勘探机会。在本研究中，利用测井、三维地震和生物地层数据，对尼日尔三角洲盆地KOC油田进行了综合层序地层和储层建模，以评估油气潜力，并揭示了研究区域的储层几何形状、地层构型和构造格架。7口井的测井和生物相信息，以及001井和039井提供的3个层序边界（SB）和3个最大淹水面（MFS）等关键地层面，构成了整个油田年代地层对比的基础。绘制以最大泛洪面为界的两个基因序列，分别命名为基因序列1 （G_SEQ1）和基因序列2 （G_SEQ2）。根据所鉴定的基因序列，划分出了低水位系统域（LST）、高水位系统域（HST）和海侵系统域（TST） 3种主要的叠加模式（进积、退积和堆积）。通过井间岩性对比，发现2个含油气砂单元具有良好的储层物性特征。R12砂和R15砂属于G_SEQ2的LST和TST，被解释为盆地底扇和河道充填复合体，沉积于浅海-深海环境。三维地质模拟结果显示，该区构造闭包较厚，是油气聚集的有利位置。由于地层并置，主要断裂构成了良好的储层封印，这可能是导致倾斜滑动运动的主要原因。

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来源期刊

Marine and Petroleum Geology 地学-地球科学综合

CiteScore

8.80

自引率

14.30%

发文量

475

审稿时长

63 days

期刊介绍： Marine and Petroleum Geology is the pre-eminent international forum for the exchange of multidisciplinary concepts, interpretations and techniques for all concerned with marine and petroleum geology in industry, government and academia. Rapid bimonthly publication allows early communications of papers or short communications to the geoscience community. Marine and Petroleum Geology is essential reading for geologists, geophysicists and explorationists in industry, government and academia working in the following areas: marine geology; basin analysis and evaluation; organic geochemistry; reserve/resource estimation; seismic stratigraphy; thermal models of basic evolution; sedimentary geology; continental margins; geophysical interpretation; structural geology/tectonics; formation evaluation techniques; well logging.