当前位置: X-MOL 学术Pet. Geosci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Evolution of a sand-rich submarine channel-lobe system, and the impact of mass-transport and transitional-flow deposits on reservoir heterogeneity: Magnus Field, Northern North Sea
Petroleum Geoscience ( IF 1.7 ) Pub Date : 2021-05-17 , DOI: 10.1144/petgeo2020-095
Michael J. Steventon 1 , Christopher A.-L. Jackson 1 , Howard D. Johnson 1 , David M. Hodgson 2 , Sean Kelly 3 , Jenny Omma 4 , Christine Gopon 4 , Christopher Stevenson 5 , Peter Fitch 1
Affiliation  

The geometry, distribution and rock properties (i.e. porosity and permeability) of turbidite reservoirs, and the processes associated with turbidity current deposition, are relatively well known. However, less attention has been given to the equivalent properties resulting from laminar sediment gravity-flow deposition, with most research limited to cogenetic turbidite debrites (i.e. transitional-flow deposits) or subsurface studies that focus predominantly on seismic-scale mass-transport deposits (MTDs). Thus, we have a limited understanding of the ability of subseismic MTDs to act as hydraulic seals, and their effect on hydrocarbon production and/or carbon storage. We investigate the gap between seismically resolvable and subseismic MTDs, and transitional-flow deposits on long-term reservoir performance in this analysis of a small (<10 km-radius submarine fan system), Late Jurassic, sandstone-rich stacked turbidite reservoir (Magnus Field, Northern North Sea). We use core, petrophysical logs, pore fluid pressure, quantitative evaluation of minerals by scanning electron microscopy (QEMSCAN) and 3D seismic-reflection datasets to quantify the type and distribution of sedimentary facies and rock properties. Our analysis is supported by a relatively long (c. 37 years) and well-documented production history. We recognize a range of sediment gravity deposits: (i) thick-/thin-bedded, structureless and structured turbidite sandstone, constituting the primary productive reservoir facies (c. porosity = 22%, permeability = 500 mD); (ii) a range of transitional-flow deposits; and (iii) heterogeneous mud-rich sandstones interpreted as debrites (c. porosity ≤ 10%, volume of clay = 35%, up to 18 m thick). Results from this study show that over the production timescale of the Magnus Field, debrites act as barriers, compartmentalizing the reservoir into two parts (upper and lower reservoir), and transitional-flow deposits act as baffles, impacting sweep efficiency during production. Prediction of the rock properties of laminar- and transitional-flow deposits, and their effect on reservoir distribution, has important implications for: (i) exploration play concepts, particularly in predicting the seal potential of MTDs; (ii) pore-pressure prediction within turbidite reservoirs; and (iii) the impact of transitional-flow deposits on reservoir quality and sweep efficiency.

Supplementary material: of data and methods are available at https://doi.org/10.6084/m9.figshare.c.5313860



中文翻译:

富砂海底河道系统的演变以及质量输运和过渡流沉积物对储层非均质性的影响:北海北部马格努斯油田

浊积岩储层的几何形状,分布和岩石性质(即孔隙度和渗透率)以及与浊流沉积有关的过程是相对众所周知的。但是,对层流沉积物重力流沉积所产生的等效性质的关注较少,大多数研究仅限于共生浊质碎屑岩(即过渡流沉积物)或主要关注地震规模传质沉积物的地下研究( MTDs)。因此,我们对亚地震MTD充当液压密封件的能力及其对碳氢化合物生产和/或碳存储的影响了解有限。在此分析中,我们研究了地震可分辨和亚地震MTD与过渡流沉积物对长期储层性能的影响之间的差距。半径10公里的海底扇形系统),晚侏罗世,富砂岩的叠层浊积岩储层(北海北部的马格努斯油田)。我们使用岩心,岩石物理测井,孔隙流体压力,通过扫描电子显微镜(QEMSCAN)和3D地震反射数据集对矿物进行定量评估,以量化沉积相的类型和分布以及岩石性质。我们的分析得到了相对较长的(C。37年)和有据可查的生产历史。我们认识到一个范围沉积物重力沉积的:(ⅰ)厚壁/薄层,无结构和结构化的浊砂岩,构成一次生产储集岩相(。ç孔隙率= 22%,渗透率= 500 MD); (ii)一系列过渡流沉积物;(iii)异质富泥砂岩被解释为碎屑岩(c。孔隙率≤10%,粘土体积= 35%,最大厚度为18 m)。这项研究的结果表明,在马格努斯油田的生产时间内,碎屑充当屏障,将储层划分为两部分(上部和下部储层),过渡流沉积物充当挡板,影响了生产过程中的清扫效率。预测层流和过渡流沉积物的岩石特性及其对储层分布的影响,对以下方面具有重要意义:(i)勘探活动概念,尤其是在预测MTD的封闭潜力方面;(ii)浊积岩储层内的孔隙压力预测;(iii)过渡流沉积物对储层质量和吹扫效率的影响。

补充材料:有关数据和方法的信息,请访问https://doi.org/10.6084/m9.figshare.c.5313860

更新日期:2021-05-17
down
wechat
bug