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首页> 外文会议>Geothermal Resources Council Annual Meeting >Geologic Characterization of Pre-Tertiary Rocks at the Desert Peak East EGS Project Site, Churchill County, Nevada
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Geologic Characterization of Pre-Tertiary Rocks at the Desert Peak East EGS Project Site, Churchill County, Nevada

机译：沙漠峰值东，EGS项目现场，丘吉尔县，内华达州丘陵峰的地质特征

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摘要

A DOE-Industry cost-shared project is underway at Desert Peak East, located within the Hot Springs Mountains, northwestern Churchill County, approximately 50 miles (80.5 km) northeast of Reno, Nevada. The potential reservoir under investigation is contained within pre-Tertiary metamorphic and granitic rocks with temperatures exceeding 400°F (204°C). The purpose of the geologic study is to determine the lateral and vertical extent of basement lithologies, and the character and mineralogy of natural fracturing in the rocks to identify suitable targets for hydrofracturing and stimulation in subsequent phases of this enhanced geothermal system (EGS) project. Petrographic and X-ray diffraction studies of rock samples from deep drill hole DP 23-1 and core hole 35-13 TCH characterize the pre-Tertiary stratigraphic section in the project area as a sequence of weakly metamorphosed marine sediments, tephra deposits, and dioritic rocks that have been intruded by a younger two-mica granodiorite. The metamorphic pre-Tertiary sequence can be divided into two distinctive subunits based on differences in texture, metamorphic grade, and lithology. Subunit 1 (pT1) is composed of non-foliated pelites, mudstones and fine-grained tephra deposits that have undergone low-grade regional greenschist metamorphism. Subunit 2 (pT2) underlies pT1, and is composed of foliated phyllites and biotite and chlorite schists that are interlayered with mafic to intermediate composition intrusive rocks. Contact metamorphism and hornfelsic recrystallization of metasedimentary rocks in subunit pT2 has occurred near the contact with the younger granodiorite intrusive. The pre-Tertiary stratigraphy can be correlated across the project area between wells DP 23-1 and 35-13 TCH, a distance of 1.5 miles (2.4 km). Several potential EGS target units have been identified. A laterally extensive but intensely altered and veined quartz monzodiorite unit with a thickness of more than 320 feet (98 m) is found at a depth of 5,060 feet (1,542 m) in well DP 23-1 and at 3,123 feet (951 m) in 35-13 TCH. A hornblende diorite with a thickness of about 220 feet is found at 6,800 feet (2,073 m) in DP 23-1. The younger granodiorite in DP 23-1 is at least 2,494 feet (760 m) thick and present at depths between 7,020 feet to TD at 9,641 feet (2,140 to 2,939 m). The uniform petrologic properties and the thickness of the granodiorite in well DP 23-1 indicate an excellent EGS target.
机译：Dee-Industry成本共享项目正在东风山顶，位于丘陵县的温泉山脉内，约50英里（80.5公里）Nevada Nevada的东北部。正在调查的潜在储层包含在三级变质和花岗岩岩石中，温度超过400°F（204℃）。地质研究的目的是确定地下室岩性的横向和垂直程度，以及岩石中自然压裂的特征和矿物学，以确定这种增强地热系统（EGS）项目的随后阶段的水力安全性和刺激的合适靶标。来自深钻孔DP 23-1和芯孔35-13 TCH的岩石样品的岩石和X射线衍射研究表征了项目面积的预三级地层部分，作为一系列弱变质的海洋沉积物，Tephra沉积物和二偏转被较年轻的双云母细碎机侵入的岩石。变质前序列可以基于质地，变质等级和岩性的差异分为两个独特的亚基。亚基1（Pt1）由非叶片百分之一，泥岩和细粒度的Tephra沉积物组成，该矿石和细粒度的Tephra沉积物经历了低于地区绿色树木变质性变质形态。亚基2（Pt2）底层Pt1，由叶片的植物和生物烟灰和生物烟灰和氯酸盐片组成，其与中间组合物侵入岩石中的乳头粘附。亚单位PT2中的亚单位岩石的接触变质和Hornfelsic重结晶在与较年轻的Granodiorite侵扰性接近接近。在井DP 23-1和35-13 TCH之间的项目区域中，距离的距离是1.5英里（2.4公里）的预三级地层。已经确定了几个潜在的EGS目标单元。横向且强烈地改变的厚度超过320英尺（98米）的横向且宽大的石英莫罗石单元，深度为5,060英尺（1,542米），井下DP 23-1和3,123英尺（951米） 35-13 TCH。厚度为约220英尺的角质层二才在DP 23-1中以6,800英尺（2,073米）达到厚度。 DP 23-1中的较年轻的Granodiorite至少为2,494英尺（760米），深度为7,020英尺至Td，在9,641英尺（2,140至2,939μm）之间。均匀的浮雕性和井DP 23-1中的Granodiorite的厚度表示优异的EGS靶。

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