侏罗纪深水储层的转移-转换偏移:加拿大东南部边缘混合碳酸盐-硅质碎屑岩谢尔本子盆地建模

IF 2.7 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
AAPG Bulletin Pub Date : 2024-01-01 DOI:10.1306/01172320041
Justin Nagle, David J. W. Piper, E. Marfisi, Georgia Pe-Piper, F. Saint-Ange
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引用次数: 0

摘要

中生代-新生代斯科舍盆地向西南终止于雅茅斯转移断层带。盆地的这一部分,即西部谢尔本子盆地,显示出与主苏格兰盆地不同的地质演变。它是盆地中最有石油开采前景的部分,但仍未得到充分勘探。本研究通过使用前向地层模型,研究了转移断层带在沉积物扩散和深水碎屑岩储层定位中的作用。使用 DionisosFlowTM 软件模拟了 Callovian-Tithonian(侏罗纪)碎屑岩和碳酸盐岩地层的分布。使用 CougarFlowTM 软件分析了模型中不确定参数的敏感性。雅茅斯转移断层带在盆地中形成了斜坡和地形低谷,影响了沉积物的分布,也将长距离河流补给集中到了谢尔本三角洲。在晚侏罗世,潮湿的气候导致大量沉积物排出,即使在海平面上升和碳酸盐广泛堆积的时期,也造成了碎屑岩的阶降。建模表明,在远离三角洲的地方,较深的初始水深比较浅的斜坡水深更能解释所观察到的稳定的陆架边缘礁生长。敏感性分析表明,即使排水量和沙子扩散系数较低,来自谢尔本三角洲的碎屑沉积物也会向深水区移动。在上斜坡陡峭的地方,沙质沉积物会绕过上斜坡,堆积在盆地底部的扇形区域,这是建模所预测的,在未受盐构造干扰的小区域,河道-堤坝系统的地震解释也证实了这一点。因此,前向地层模型是了解此类未充分勘探地区石油地质情况的重要工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Jurassic deep-water reservoirs at a transfer-transform offset: Modeling the mixed carbonate-siliciclastic Shelburne subbasin, southeastern Canadian margin
The Mesozoic–Cenozoic Scotian Basin terminates southwestward at the Yarmouth transfer fault zone. That part of the basin, the western Shelburne subbasin, shows a different geological evolution from the main Scotian Basin. It is the most prospective part of the basin for oil, but it remains underexplored. This study investigates the role of the transfer fault zone in sediment dispersion and deep-water clastic reservoir location by using forward stratigraphic modeling. DionisosFlowTM software was used to simulate the distribution of Callovian–Tithonian (Jurassic) clastic and carbonate strata. Sensitivity to the uncertain parameters in the model was analyzed with CougarFlowTM software. The Yarmouth transfer fault zone created ramps and topographic lows in the basin, which influenced sediment distribution and also focused long-distance river supply at the Shelburne delta. In the Late Jurassic, humid climate led to high sediment discharge, resulting in clastic progradation even during times of rising sea levels and widespread carbonate accumulation. Away from the delta, modeling suggests that deeper initial bathymetry accounts for the observed stable shelf-edge reef growth better than a shallower ramp bathymetry. Sensitivity analysis indicates that clastic sediments from the Shelburne delta prograded into deep water, even if water discharge and sand diffusion coefficients were low. Where the upper slope was steep, it was bypassed by sandy sediment that accumulated in basin-floor fans, predicted by modeling and confirmed by seismic interpretation of a channel-levee system in small areas undisturbed by salt tectonics. Forward stratigraphic modeling is thus an important tool for understanding petroleum geology in such underexplored areas.
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来源期刊
AAPG Bulletin
AAPG Bulletin 工程技术-地球科学综合
CiteScore
6.60
自引率
11.40%
发文量
73
审稿时长
4.8 months
期刊介绍: While the 21st-century AAPG Bulletin has undergone some changes since 1917, enlarging to 8 ½ x 11” size to incorporate more material and being published digitally as well as in print, it continues to adhere to the primary purpose of the organization, which is to advance the science of geology especially as it relates to petroleum, natural gas, other subsurface fluids, and mineral resources. Delivered digitally or in print monthly to each AAPG Member as a part of membership dues, the AAPG Bulletin is one of the most respected, peer-reviewed technical journals in existence, with recent issues containing papers focused on such topics as the Middle East, channel detection, China, permeability, subseismic fault prediction, the U.S., and Africa.
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