scholarly journals Geothermal sweetspots identified in a volcanic lake integrating bathymetry and fluid chemistry

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Maren Brehme ◽  
Ronny Giese ◽  
Lily Suherlina ◽  
Yustin Kamah
Keyword(s):  
Hot Springs ◽  
Geothermal Resource ◽  
Acidic Water ◽  
Tectonic Structures ◽  
Volcanic Lake ◽  
Volcanic Lakes ◽  
Western Shore ◽  
Drilling Site ◽  
Well Data ◽  
High Resolution Bathymetry

Abstract We investigate fluid pathways beneath volcanic lakes using bathymetry and geochemical measurements to locate best-possible drilling sites. Highly permeable structures, such as faults, provide fluid channels that are the most suitable access points to the geothermal resource. Accurate mapping of these structures therefore guides the successful targeting of wells. Lakes, rivers or ocean, can hide surface footprints of these permeable structures, such as in our case beneath Lake Linau. High-resolution bathymetry identifies linear and conical discontinuities, which are linked to offshore tectonic structures as confirmed by surrounding outcrops and hot springs. Geochemical measurements document inflow of hot saline acidic water into the lake verifying bathymetry-located highly permeable structures. Integrating onshore well data, our bathymetry and chemical results locates an ideal drilling site into the geothermal reservoir beneath the western shore line of Lake Linau.

scholarly journals Fluid pathways identified beneath Narlı Lake (Central Anatolia) show the geothermal potential of former volcanoes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Maren Brehme ◽  
Ronny Giese ◽  
Uğur Erdem Dokuz ◽  
Fatih Bulut
Keyword(s):  
High Resolution ◽  
Hot Springs ◽  
Tectonic Setting ◽  
Shallow Groundwater ◽  
Central Anatolia ◽  
Volcanic Lake ◽  
Rock Interaction ◽  
Lake Bottom ◽  
High Concentrations ◽  
High Resolution Bathymetry

AbstractWe investigated the volcanic Narlı Lake in Central Anatolia combining high-resolution bathymetry and geochemical measurements. In this study, we present it as proof of a new concept to verify fluid pathways beneath lakes integrating the structure of the geothermal reservoir into the surrounding tectonic frame. We recognized dextral faults fracturing inherited volcanic formations and thus generating highly permeable zones beneath the lake. At intersection points of faults, reservoir fluids discharge from deep holes as imaged by the high-resolution bathymetry at the bottom of the Narlı Lake. Onshore, the tectonic setting also generates both extensional and compressional structures. Extensional structures result in extensive fluid discharge through hot springs while compressional structures do not discharge any fluid. The water of the lake as well as in the hot springs is highly saline and has relatively high concentrations of Cl, HCO3, SO4, Na, Ca, Mg, and Si. In several hot springs, we observed mixtures of high-saline fluids having a deep origin and low-saline shallow groundwater. We observed discharge into the lake by gas bubbles, which contain probably CO2 or H2S. Mineral precipitation indicates a carbonatic source at the lake bottom and along the shoreline. Extensive travertine precipitation also occurs near hot springs along the nearby extensional zone of Ihlara Valley. In summary, the composition of fluids and minerals is controlled by water–rock interaction through the volcanic and carbonatic rocks beneath this volcanic lake.

Telluric survey data for Pinto Hot Springs Known Geothermal Resource Area, Nevada; Supplement to 76-701A

1977 ◽  
Author(s):  
James E. O'Donnell ◽  
G.W. Brougham ◽  
R. Martinez ◽  
K.R. Christopherson
Keyword(s):  
Survey Data ◽  
Hot Springs ◽  
Geothermal Resource

Exploration of the Hot Springs Bay Valley (HSBV) geothermal resource area, Akutan, Alaska

Geothermics ◽  
2015 ◽  
Vol 57 ◽  
pp. 127-144 ◽  
Author(s):  
Pete Stelling ◽  
Nicholas H. Hinz ◽  
Amanda Kolker ◽  
Mary Ohren
Keyword(s):  
Hot Springs ◽  
Geothermal Resource

scholarly journals DANAU-DANAU VOLKANIK DI DATARAN TINGGI DIENG: PEMANFAATAN DAN MASALAH LINGKUNGAN YANG DIHADAPI

2017 ◽  
Vol 5 (1) ◽  
pp. 36
Author(s):  
Sudarmadji Sudarmadji ◽  
Hari Supriyono ◽  
Sri Lestari
Keyword(s):  
Water Pollution ◽  
Local Communities ◽  
The Other ◽  
Survey Method ◽  
Water Volume ◽  
Tourist Attraction ◽  
Erosion Process ◽  
Volcanic Lake ◽  
Volcanic Lakes ◽  
Local Awareness

Volcanic lakes in the Dieng Plateau are famous because of their uniqueness; they have been used for various purposes. The area of Dieng Plateau has changed. The present land use is manly for the area of potato-producing farmland. In the area erosion process caused sedimentation in the lake to occur rapidly, it reduced the volume of the lake and water pollution. On the other hand, Dieng Local communities have been using water of these lakes. This study aims to: 1)inventory of volcanic lakes and environmental impacts that occur; 2. assess the environmental degradation in the area Dieng volcanic lake; and 3. assess the wisdom of local communities in the utilization of the lake. In this research, there are four lakes, namely Telaga Warna and Pengilon (as one unit), Telaga Merdada and Telaga Cebong were studied. This research was conducted by survey method. Field observation and interview with respondents were conducted. Water samples were collected from the lakes, followed laboratory analysis. Results of this study indicate that each lake has different potentials and problems. Telaga Warna and Pengilon potential as a tourist attraction that can be developed further, Telaga Merdada already in critical condition as a result of sedimentation and reducing of water volume, while the Telaga Cebong has a better conditions as local awareness for the conservation of the lake.

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