了解地下火山相:夏威夷大岛PTA2和KMA1井的综合岩心、电缆测井和图像测井数据集

IF 1.6 Q3 GEOSCIENCES, MULTIDISCIPLINARY Scientific Drilling Pub Date : 2019-06-12 DOI:10.5194/SD-25-15-2019
D. Jerram, D. Jerram, John Millett, J. Kück, D. Thomas, S. Planke, E. Haskins, N. Lautze, S. Pierdominici
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Data for spectral gamma, magnetic susceptibility, dipmeter\nresistivity, sonic, total magnetic field, temperature and televiewer wireline\nlogs were successfully acquired for the open hole interval ca. 889 m to 1567 m within the PTA2 borehole. Spectral gamma was also collected from inside the\ncasing of both wells, extending the coverage for PTA2 to the surface and\ncovering the interval from ca. 300 to 1200 m for KMA1. High-quality core\nmaterial was available for both boreholes with almost complete recovery which\nenabled high-resolution core-to-log integration. Gamma data are generally low\ncommonly in the range ca. 7–20 gAPI but are shown to increase up to API of\nca. 60 with some intrusions and with increases in hawaiite compositions in\nthe upper part of PTA2. Velocity data are more variable due to alteration\nwithin porous volcanic facies than with burial depth, with a general degrease\ndown-hole. 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引用次数: 20

摘要

摘要为了帮助了解地下的火山相,能够将井下地球物理数据与岩心火山层段进行详细比较的数据集至关重要。然而,在许多情况下,由于具有挑战性的取心条件,火山层序中扩展岩心层段的收集是罕见的,而且往往是不完整的。在这篇文章中,我们概述并提供了夏威夷大岛上两个完全取心的熔岩为主的井眼序列PTA2和KMA1的井眼测井作业的初步结果。在PTA2井眼889 ~ 1567 m的裸眼井段,成功获取了光谱伽马、磁化率、电阻率、声波、总磁场、温度和电视有线测井数据。此外,还从两口井的套管内收集了伽马光谱,将PTA2的覆盖范围扩大到地面,KMA1的覆盖范围从300米到1200米不等。两个井眼都可以获得高质量的岩心材料,几乎完全恢复,从而实现了岩心-测井的高分辨率整合。伽马数据通常较低,通常在约7-20 gAPI范围内,但显示增加到API ofca。60,在PTA2上部有一些侵入和夏威夷岩成分的增加。由于多孔火山相内的蚀变,速度数据的变化比埋深的变化更大,在井下通常是递减的。高分辨率的电视观众数据直接与核心进行了比较,从而能够全面分析电视观众反应的变化。这使得识别关键特征成为可能,包括单个囊泡、囊泡分离、拉伸囊泡、冷冻边缘、碎石带、侵入接触和pāhoehoe叶状形态,这些特征可以在电视机数据和全直径岩心之间自信地匹配。本研究的数据集和结果包括未来通过火山层序改进井相分析的定义,特别是在没有岩心的井下数据和图像时。
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Understanding volcanic facies in the subsurface: a combined core, wireline logging and image log data set from the PTA2 and KMA1 boreholes, Big Island, Hawai`i
Abstract. To help understand volcanic facies in the subsurface, data sets that enable detailed comparisons between down-hole geophysical data and cored volcanic intervals are critical. However, in many cases, the collection of extended core intervals within volcanic sequences is rare and often incomplete due to challenging coring conditions. In this contribution we outline and provide initial results from borehole logging operations within two fully cored lava-dominated borehole sequences, PTA2 and KMA1, on the Big Island of Hawai`i. Data for spectral gamma, magnetic susceptibility, dipmeter resistivity, sonic, total magnetic field, temperature and televiewer wireline logs were successfully acquired for the open hole interval ca. 889 m to 1567 m within the PTA2 borehole. Spectral gamma was also collected from inside the casing of both wells, extending the coverage for PTA2 to the surface and covering the interval from ca. 300 to 1200 m for KMA1. High-quality core material was available for both boreholes with almost complete recovery which enabled high-resolution core-to-log integration. Gamma data are generally low commonly in the range ca. 7–20 gAPI but are shown to increase up to API of ca. 60 with some intrusions and with increases in hawaiite compositions in the upper part of PTA2. Velocity data are more variable due to alteration within porous volcanic facies than with burial depth, with a general degrease down-hole. The high-resolution televiewer data have been compared directly to the core, enabling a comprehensive analysis of the variations in the televiewer responses. This has enabled the identification of key features including individual vesicles, vesicle segregations, strained vesicles, chilled margins, rubble zones, intrusive contacts and pāhoehoe lobe morphologies, which can be confidently matched between the televiewer data and the full diameter core. The data set and results of this study include findings which should enable improved borehole facies analysis through volcanic sequences in the future, especially where down-borehole data and images but no core are available.
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来源期刊
Scientific Drilling
Scientific Drilling GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
2.50
自引率
0.00%
发文量
12
审稿时长
27 weeks
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