利用实验室测量和数字岩石物理方法,对白垩纪碳酸盐岩储层的孔隙度和渗透率异质性进行从孔隙到岩心塞的表征,阿布扎比,阿拉伯联合酋长国

IF 3.7 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Abdulquadri O. Alabere , Mohamed Soufiane Jouini , Mohammad Alsuwaidi , Daniel Morad , Fadi H. Nader , Fateh Bouchalaa , Emad W. Al-Shalabi , Osama Al Jallad
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引用次数: 0

摘要

通过对阿拉伯联合酋长国阿布扎比白垩纪石灰岩储层进行实验室和数字岩石物理研究,可以深入了解孔隙连通性、孔喉尺寸和渗透率分布。研究过程包括使用微型计算机断层扫描、扫描电子显微镜和纳米计算机断层扫描技术对不同尺度的岩心进行分析;使用分割技术对孔隙度进行量化;使用晶格玻尔兹曼法对渗透率进行数值模拟;以及使用达西定律将模拟结果放大到岩心-岩芯尺度。连通孔隙比不连通孔隙所占比例大的原因是:(i) 早期成岩过程中形成的晶粒镶边方解石胶结物降低了机械压实和孔喉尺寸缩小的程度;(ii) 由于沉积物埋藏速度快,生物扰动引入的碳酸盐泥有限;(iii) 分配岩的溶解和微晶基质的部分白云石化。海底微生物对分配岩的微粒化作用导致以单模态大孔隙为主的颗粒支撑灰岩转变为具有多模态孔隙度的储层。相反,泥质支撑灰岩具有沉积单模态微孔分布,这种分布因机械压实和微晶石颗粒周围方解石微增生的胶结而减少。实验室值与模拟值之间的良好一致性表明,不同沉积环境中的横向面和相关纹理变化对数字岩石物理技术预测石灰岩储层岩石物理特性的影响有限。尽管如此,针对复杂、各向异性的石灰岩储层,在地质背景下仔细选择有代表性的基本体积是获得可靠结果的关键。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Pore to core plug scale characterization of porosity and permeability heterogeneities in a Cretaceous carbonate reservoir using laboratory measurements and digital rock physics, Abu Dhabi, United Arab Emirates
Laboratory and digital rock physics study of a Cretaceous limestone reservoir in Abu Dhabi, United Arab Emirates, provides insights into pore connectivity, pore-throat size, and permeability distributions. The procedure involves core analysis at different scales using micro-computed tomography, scanning electron microscopy, and nano-computed tomography; porosity quantification using segmentation techniques; numerical simulation of permeability using lattice Boltzmann method; and upscaling simulation results to core-plug scale using Darcy's Law. The greater proportion of connected versus poorly interconnected pores is attributed to (i) the formation of early diagenetic grain-rimming calcite cement, which reduced the degree of mechanical compaction and pore-throat size reduction, (ii) limited introduction of carbonate mud by bioturbation due to rapid sediment burial, and (iii) dissolution of allochems and partial dolomitization of micrite matrix. Microbial micritization of allochems at the seafloor led to the transformation of grain-supported limestones, dominated by unimodal macropores, into reservoirs with multimodal porosity. Conversely, the mud–supported limestones have depositional unimodal micropore distribution, which is reduced by mechanical compaction and cementation by calcite micro-overgrowths around micrite particles. Good agreement between laboratory and simulated values suggests that lateral facies and related textural variation across different depositional environments have limited implications for digital rock physics techniques in predicting the petrophysical properties of limestone reservoirs. Nevertheless, careful selection of representative elementary volume within a geologic context for a complex, anisotropic limestone reservoir is the key to achieving reliable results.
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来源期刊
Marine and Petroleum Geology
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.
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