Secondary porosity and pore aspect ratios integrated with permeability and FMI logs to characterize flow zones at a Port Mayaca aquifer in South Florida

Q2 Earth and Planetary Sciences
Leading Edge Pub Date : 2023-09-01 DOI:10.1190/tle42090625.1
Jorge O. Parra
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引用次数: 0

Abstract

The complex pore structure of carbonate aquifers presents a challenge to interpreters analyzing geophysical logs and geologic data. A significant task is to develop physical rock models to determine the microstructure that provides information about flow-zone paths within the aquifer. In an attempt to achieve this task, an algorithm is devised to predict the secondary porosity formed by stiff macropores, compliant micropores, touching vugs, and pore aspect ratios from sonic logs. The pore aspect ratios are classified in intervals that delineate permeable and low permeability zones of aquifers. This provides information about the presence of isolated vugs, which do not contribute to the flow and connect or touch vugs that are part of the flow zones. The inversion results determined that permeable channels have pore aspect ratios 0.01–0.2. Alternatively, vugs with aspect ratios 0.5–1 are not forming permeable paths because they are isolated and are not contributing to flow zones. The inversion of P- and S-wave velocity logs using density and total porosity logs obtains the secondary porosity and pore aspect ratios. It found optimum correlation coefficients of 0.9975 for S-wave and 0.9405 for P-wave velocities by constraining the solution with the natural relation of the total porosity versus primary plus secondary porosities. The Port Mayaca aquifer includes Stoneley-wave permeability, formation microimager logs, and microresistivity logs, which together with pore aspect ratio and secondary porosity logs delineate and characterize the flow zones. In addition, data integration demonstrates that the vug porosity log detects fractures in resistive, permeable, and dense cemented zones. This new finding creates vug signatures, with their maximums resembling the shapes of the corresponding resistivity heights in the microresistivity log. In conclusion, it is shown that the anomaly zones correspond to water production regions, and their presence is confirmed with flow meter logs.
二次孔隙度和孔隙纵横比与渗透率和FMI测井相结合,以表征南佛罗里达州马亚卡港含水层的流动带
碳酸盐含水层复杂的孔隙结构对分析地球物理测井和地质数据的口译员提出了挑战。一项重要任务是开发物理岩石模型,以确定微观结构,从而提供含水层内流动带路径的信息。为了实现这一任务,设计了一种算法来预测声波测井中由坚硬的大孔、柔顺的微孔、接触洞穴和孔隙纵横比形成的次生孔隙。孔隙纵横比按划分含水层渗透带和低渗透带的间隔进行分类。这提供了关于孤立洞穴存在的信息,这些洞穴对流动没有贡献,并连接或触摸作为流动区域一部分的洞穴。反演结果表明,渗透通道的孔隙纵横比为0.01–0.2。或者,纵横比为0.5–1的洞穴不会形成可渗透路径,因为它们是孤立的,对流动区没有贡献。利用密度测井和总孔隙度测井反演P波和S波速度测井,得到次生孔隙度和孔隙纵横比。通过用总孔隙度与一次孔隙度和二次孔隙度的自然关系约束解,发现S波速度的最佳相关系数为0.9975,P波速度的最优相关系数为0.9405。马亚卡港含水层包括斯通利波渗透率、地层微成像测井和微电阻率测井,这些测井与孔隙纵横比和次生孔隙度测井一起描绘和表征了流动带。此外,数据集成表明,洞穴孔隙度测井可以检测到电阻、渗透和致密胶结带中的裂缝。这一新发现创造了vug特征,其最大值类似于微电阻率测井中相应电阻率高度的形状。总之,异常带与产水区相对应,并通过流量计测井证实了异常带的存在。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Leading Edge
Leading Edge Earth and Planetary Sciences-Geology
CiteScore
3.10
自引率
0.00%
发文量
180
期刊介绍: THE LEADING EDGE complements GEOPHYSICS, SEG"s peer-reviewed publication long unrivalled as the world"s most respected vehicle for dissemination of developments in exploration and development geophysics. TLE is a gateway publication, introducing new geophysical theory, instrumentation, and established practices to scientists in a wide range of geoscience disciplines. Most material is presented in a semitechnical manner that minimizes mathematical theory and emphasizes practical applications. TLE also serves as SEG"s publication venue for official society business.
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