Utilization of chemostratigraphy to the subregional scale correlation of Permo-Carboniferous sediments, eastern Saudi Arabia

IF 1.9 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Petroleum Geoscience Pub Date : 2023-06-21 DOI:10.1144/petgeo2023-007

N. Craigie, C. Scheibe

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Abstract

The following chemostratigraphy study was completed on the Permo-Carboniferous Unayzah Group in Eastern Saudi Arabia. The aim of the study was to determine whether the technique could be used to identify formation and member boundaries on a subregional scale, with the area extending for approximately 550 Km in a NW-SE direction and 350 Km NE-SW. A total of 30,375 core and cuttings samples were analyzed from 225 wells using ICP (inductively Coupled Plasma) and XRF (X-ray Fluorescence) instruments, with data acquired for 42-53 elements for each sample in the range Na-U in the periodic table. Of these, details of 14 wells are discussed in the present work. Based on variations in Zr/Ti, Zr/U, Zr/Y, Y/U, U/Th, Gd/Zr, Nb/Yb and Nb/Th it is possible to identify a hierarchical order of one zone, fours subzones and five divisions, these chemozones being correlative on a subregional scale. By comparing geochemical, biostratigraphic, sedimentological and wireline log data in selected reference wells, it was possible to relate chemozones to particular members of the Unayzah Group. The differences in geochemistry between these chemozones/members is largely explained by changes in provenance, though depositional environment may have exerted at least some influence.

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化学地层学在沙特东部二叠系-石炭系沉积物分区域尺度对比中的应用

对沙特阿拉伯东部二叠纪-石炭系Unayzah群进行了化学地层学研究。该研究的目的是确定该技术是否可以用于识别分区域范围内的地层和成员边界，该区域在西北-东南方向延伸约550公里，在东北-西南方向延伸约350公里。使用ICP(电感耦合等离子体)和XRF (x射线荧光)仪器分析了225口井的30,375个岩心和岩屑样品，每个样品在元素周期表中Na-U范围内获得了42-53个元素的数据。本文对其中14口井的详细情况进行了讨论。根据Zr/Ti、Zr/U、Zr/Y、Y/U、U/Th、Gd/Zr、Nb/Yb和Nb/Th的变化，可以确定一个带、四个亚带和五个分区的等级顺序，这些化学带在分区域尺度上是相互关联的。通过比较选定参考井的地球化学、生物地层学、沉积学和电缆测井数据，可以将化学带与Unayzah群的特定成员联系起来。这些化学带/成员之间的地球化学差异在很大程度上可以用物源的变化来解释，尽管沉积环境可能至少产生了一些影响。

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来源期刊

Petroleum Geoscience 地学-地球科学综合

CiteScore

4.80

自引率

11.80%

发文量

审稿时长

>12 weeks

期刊介绍： Petroleum Geoscience is the international journal of geoenergy and applied earth science, and is co-owned by the Geological Society of London and the European Association of Geoscientists and Engineers (EAGE). Petroleum Geoscience transcends disciplinary boundaries and publishes a balanced mix of articles covering exploration, exploitation, appraisal, development and enhancement of sub-surface hydrocarbon resources and carbon repositories. The integration of disciplines in an applied context, whether for fluid production, carbon storage or related geoenergy applications, is a particular strength of the journal. Articles on enhancing exploration efficiency, lowering technological and environmental risk, and improving hydrocarbon recovery communicate the latest developments in sub-surface geoscience to a wide readership. Petroleum Geoscience provides a multidisciplinary forum for those engaged in the science and technology of the rock-related sub-surface disciplines. The journal reaches some 8000 individual subscribers, and a further 1100 institutional subscriptions provide global access to readers including geologists, geophysicists, petroleum and reservoir engineers, petrophysicists and geochemists in both academia and industry. The journal aims to share knowledge of reservoir geoscience and to reflect the international nature of its development.