成岩过程对巴西桑托斯盆地始新世前盐碳酸盐岩岩石物理特征的影响

IF 2.7 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
AAPG Bulletin Pub Date : 2024-01-01 DOI:10.1306/05302322046
Hugo Tamoto, André Luiz Silva Pestilho, Anelize Manuela Bahniuk Rumbelsperger
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引用次数: 0

摘要

位于巴西边缘盆地的盐前碳酸盐岩储层是全球最重要的碳氢化合物产区之一。这些油藏约占巴西近海石油产量的 75%。尽管岩前储层具有良好的岩石物理特性(孔隙率大于 15%,渗透率大于 100 md),但由于对复杂的沉积和成岩历史所导致的岩石物理控制缺乏了解,因此仍然面临着挑战。为了解决这些问题,对桑托斯盆地 Sapinhoá 油田 Aptian Barra Velha 地层的碳酸盐岩储层进行了全面评估。这项研究使用了大量的测井记录、岩石物理和 X 射线衍射数据集,确定了岩相异质性、不同的岩石物理分布和五个水力流动单元。总体而言,在位于构造高位的油井中发现了孔隙度和渗透率最高的最佳岩石物理层段,这些油井由水流单元 4 和 5 组成,主要由灌木和谷物支撑面构成,其次是所有油井中都有的中间水流单元 3。此外,在所有单元中,1 号和 2 号流动单元的岩石物理值最低,主要出现在盆地向下的油井中。最后,研究结果表明,粘土矿物溶解、方解石结构溶解和白云石化过程等主要成岩特征是普遍提高岩石物理特性的显著因素。此外,普遍存在的硅化过程会降低储层质量。这些过程通常出现在位于油田构造高地和盆地向下区域的油井中。最后,通过多尺度特征描述,可以广泛了解成岩作用对碳酸盐岩岩石物理特性的主要影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impacts of diagenetic processes on petrophysical characteristics of the Aptian presalt carbonates of the Santos Basin, Brazil
The presalt carbonate reservoirs located at the marginal basins of Brazil are one the most important hydrocarbon provinces worldwide. These reservoirs are responsible for approximately 75% of the Brazilian offshore oil production. Despite the presalt reservoirs’ present good petrophysical qualities (porosity >15% and permeability >100 md), there are still challenges related to the lack of understanding of the petrophysical controls resulting from a complex depositional and diagenetic history. To address such problems, an overall evaluation of the carbonate reservoir was provided on the Aptian Barra Velha Formation in the Sapinhoá field, Santos Basin. This research used an extensive data set of well logs, petrophysics, and x-ray diffraction, which identified facies heterogeneities, variated petrophysical distribution, and five hydraulic flow units. Overall, the best petrophysical intervals with highest porosity and permeability are found in the wells located at the structural high comprising the flow units 4 and 5 and mostly consisting of shrub and grain-supported facies followed by an intermediary flow unit 3 found in all wells. Moreover, among all units, flow units 1 and 2 presented the lowest petrophysical values, mainly found at the basinward wells. Finally, results indicate that key diagenetic features such as dissolution of clay minerals, dissolution of calcite fabric, and dolomitization processes are notable elements that commonly enhanced petrophysical properties. Additionally, the pervasive silicification process decreases the reservoir quality. These processes are commonly found in the wells located in the structural high and basinward areas of the field. Lastly, a multiscale characterization allows a broad comprehension of the key diagenetic impacts into carbonates’ petrophysical properties.
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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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