EGU 2016: ORAL

LUSI LIBRARY: TEN YEARS OF LUSI ERUPTION

Slide19

Contributed by: Hardi Prasetyo, BPLS

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European Geosciences UnionGeneral Assembly 2016Vienna | Austria | 17–22 April 2016

Orals SSP3.16/GMPV8.10

SSP3.16/GMPV8.10

Ten years of Lusi eruption – lessons learned about modern and ancient piercement systems (co-organized)

Convener: Adriano Mazzini
Co-Conveners: Sverre Planke , Matteo Lupi
Session details
 Add this session to your personal programme
Tuesday, 19 Apr 2016
Room: M2
Chairperson: Mazzini, A., Lupi, M., Planke, S.
13:30–13:45

EGU2016-15525
Ten years of Lusi: A review

(solicited)
Stephen A. Miller

13:45–14:00

EGU2016-15068
Subsurface geology of the Lusi region: preliminary results from a comprehensive seismic-stratigraphic study.
Andrea Moscariello, Damien Do Couto, Matteo Lupi, and Adriano Mazzini
14:00–14:15

EGU2016-4485
3D Geological Model for “LUSI” – a Deep Geothermal System
Reza Sohrabi, Gunnar Jansen, Adriano Mazzini, Boris Galvan, and Stephen A. Miller
14:15–14:30

EGU2016-9436
The Geothermal Systems along the Watukosek fault system (East Java, Indonesia):The Arjuno-Welirang Volcanic Complex and the Lusi Mud-Eruption
Salvatore Inguaggiato, Adriano Mazzini, Fabio Vita, and Alessandra Sciarra
14:30–14:45

EGU2016-360
Analysis of Focal Mechanism and Microseismicity around the Lusi Mud Eruption Site, East Java, Indonesia
Karyono Karyono, Anne Obermann, Adriano Mazzini, Matteo Lupi, Ildrem Syafri, Abdurrokhim Abdurrokhim, Masturyono Masturyono, and Soffian Hadi
14:45–15:00

EGU2016-11129
The Lusi eruption and implications for understanding fossil piercement structures in sedimentary basins 
Henrik Svensen, Adriano Mazzini, Sverre Planke, and Soffian Hadi

 

Geophysical Research Abstracts
Vol. 18, EGU2016-15525-3, 2016
EGU General Assembly 2016
© Author(s) 2016. CC Attribution 3.0 License.

Ten years of Lusi: A review

Stephen A. Miller
(stephen.miller@unine.ch), Center for Hydrogeology and Geothermics (CHYN), University of Neuchatel, Switzerland

The Lusi mud eruption has continued uninterrupted for ten years, settling into its current steady-state as a quasi-periodic geyser system. Many past, current, and future studies aim to quantify this system, which increasing evidence suggests is a new-born, tectonic scale hydrothermal system linked to the nearby volcano complex. The debate about whether the triggering of Lusi was a natural event of rather caused by drilling continues, but evidence mounts from the behavior of this system that an anthropogenic cause is highly unlikely. Understanding this system is very important because of its social and economic impact on the surrounding communities, and whether it poses future geohazards in the region from future eruptions. A large effort of infrastructures and constant maintenance activity has been and is being conducted inside the 7km2 mud flooded area. This region is framed by a tall embankment that contains the erupted mud and protects the surrounding settlements. This system is also very important for understanding at a larger scale volcanic hydrothermal systems, and to determine whether this new geothermal resource might be exploited. A large effort is underway from an EU-grant supporting the Lusi-Lab project (CEED, University of Oslo) and an SNF grant supporting the University of Neuchatel to study this system from geochemical, geophysical, and modeling perspectives. This review talk summarizes what is known, what is still unclear, and will revisit the behavior of Lusi since its inception.

 

 

Geophysical Research Abstracts
Vol. 18, EGU2016-15068, 2016
EGU General Assembly 2016
© Author(s) 2016. CC Attribution 3.0 License.

Subsurface geology of the Lusi region: preliminary results from a comprehensive seismic-stratigraphic study.

Andrea Moscariello (1), Damien Do Couto (1), Matteo Lupi (1), and Adriano Mazzini (2)

(1) Department of Earth Sciences, University of Geneva 13 Rue des Maraichers, 1205 Geneva, Switzerland, (2) Center of Earth Evolution and Dynamics, University of Oslo, Sem Sælandsvei 2A, , 0371 Oslo, Norway

We investigate the subsurface data of a large sector in the Sidoarjo district (East Java, Indonesia) where the sudden catastrophic Lusi eruption started the 26th May 2006. Our goal is to understand the stratigraphic and structural features which can be genetically related to the surface manifestations of deep hydrothermal fluids and thus allow us to predict possible future similar phenomena in the region.

In the framework of the Lusi Lab project (ERC grant n◦ 308126) we examined a series of densely spaced 2D reflection commercial seismic lines This allowed the reconstruction of the lateral variability of key stratigraphic horizons as well as the main tectonic features.
In particular, we shed light on the deep structure of the Watukosek fault system and the associated fracture corridors crossing the entire stratigraphic successions.

To the South-West, when approaching the volcanic complex, we could identify a clear contrast in seismic facies between chaotic volcanoclastic wedges and clastic-prone sedimentary successions as well as between the deeper stratigraphic units consisting of carbonates and lateral shales units. The latter show possible ductile deformation associated to fault-controlled diapirism which control in turns deformation of overlying stratigraphic units and deep geo-fluids circulation. Large collapse structures recognized in the study area (e.g. well PRG-1) are interpreted as the results of shale movement at depth. Similarly to Lusi, vertical deformation zones (“pipes”), likely associated with deeply rooted strike-slip systems seem to be often located at the interface between harder carbonate rocks forming isolated build ups and the laterally nearby clastic (shale-prone)-units.

The mechanisms of deformation of structural features (strike vs dip slip systems) which may affect either the basement rock or the overlying deeper stratigraphic rocks is also being investigated to understand the relationship between deep and shallower (i.e. meteoric) fluid circulation.
Seismic stratigraphic study of the basin margin (closer to volcanic accumulations) will also allow reconstructing the relationships between present and past volcanic activity recorded in the deep subsurface with the genesis of piercement structures and development of vertical deformation zones.

 

Geophysical Research Abstracts
Vol. 18, EGU2016-4485-2, 2016
EGU General Assembly 2016
© Author(s) 2016. CC Attribution 3.0 License.

3D Geological Model for “LUSI” – a Deep Geothermal System

Reza Sohrabi (a), Gunnar Jansen (a), Adriano Mazzini (b), Boris Galvan (a), and Stephen A. Miller (a)

(a) CHYN – Centre for Hydrogeology and Geothermics, University of Neuchâtel, Switzerland, (b) CEED – Centre for Earth Evolution and Dynamics, University of Oslo, Norway

Geothermal applications require the correct simulation of flow and heat transport processes in porous media, and many of these media, like deep volcanic hydrothermal systems, host a certain degree of fracturing. This work aims to understand the heat and fluid transport within a new-born sedimentary hosted geothermal system, termed Lusi, that began erupting in 2006 in East Java, Indonesia. Our goal is to develop conceptual and numerical models capable of simulating multiphase flow within large-scale fractured reservoirs such as the Lusi region, with fractures of arbitrary size, orientation and shape. Additionally, these models can also address a number of other applications, including Enhanced Geothermal Systems (EGS), CO2 sequestration (Carbon Capture and Storage CCS), and nuclear waste isolation. Fractured systems are ubiquitous, with a wide-range of lengths and scales, making difficult the development of a general model that can easily handle this complexity.

We are developing a flexible continuum approach with an efficient, accurate numerical simulator based on an appropriate 3D geological model representing the structure of the deep geothermal reservoir. Using previous studies, borehole information and seismic data obtained in the framework of the Lusi Lab project (ERC grant n◦308126), we present here the first 3D geological model of Lusi. This model is calculated using implicit 3D potential field or multi-potential fields, depending on the geological context and complexity. This method is based on geological pile containing the geological history of the area and relationship between geological bodies allowing automatic computation of intersections and volume reconstruction. Based on the 3D geological model, we developed a new mesh algorithm to create hexahedral octree meshes to transfer the structural geological information for 3D numerical simulations to quantify Thermal-Hydraulic-Mechanical-Chemical (THMC) physical processes.

 

Geophysical Research Abstracts
Vol. 18, EGU2016-360-4, 2016
EGU General Assembly 2016
© Author(s) 2016. CC Attribution 3.0 License.

Analysis of Focal Mechanism and Microseismicity around the Lusi Mud Eruption Site, East Java, Indonesia

Karyono Karyono (1,4,5), Anne Obermann (2), Adriano Mazzini (1), Matteo Lupi (3), Ildrem Syafri (4),

Abdurrokhim Abdurrokhim (4), Masturyono Masturyono (5), and Soffian Hadi (6)

(1) CEED, University of Oslo, Norway, (4) Padjadjaran University (UNPAD), Bandung, Indonesia, (5) Agency for Meteorology, Climatology and Geophysics (BMKG), Jakarta, Indonesia, (2) ETH Zurich, Switzerland, (3) University of Geneva, Switzerland, (6) BPLS, Surabaya, Indonesia

The 29th of May 2006 numerous eruption sites started in northeast Java, Indonesia following to a M6.3 earthquake striking the island.Within a few weeks an area or nearly 2 km2 was covered by boiling mud and rock fragments and a prominent central crater (named Lusi) has been erupting for the last 9.5 years. The M.6.3 seismic event also triggered the activation of the Watukosek strike slip fault system that originates from the Arjuno-Welirang volcanic complex and extends to the northeast of Java hosting Lusi and other mud volcanoes. Since 2006 this fault system has been reactivated in numerous instances mostly following to regional seismic and volcanic ac- tivity. However the mechanism controlling this activity have never been investigated and remain poorly understood.

In order to investigate the relationship existing between seismicity, volcanism, faulting and Lusi activity, we have deployed a network of 31 seismometers in the framework of the ERC-Lusi Lab project. This network covers a large region that monitors the Lusi activity, the Watukosek fault system and the neighboring Arjuno- Welirang volcanic complex.

In particular, to understand the consistent pattern of the source mechanism, relative to the general tectonic stress in the study area, a detailed analysis has been carried out by performing the moment tensor inversion for the near field data collected from the network stations. Furthermore these data have been combined with the near field data from the regional network of the Meteorological, Climatological and Geophysical Agency of Indonesia that covers the whole country on a broader scale.

Keywords: Lusi, microseismic event, focal mechanism

 

Geophysical Research Abstracts
Vol. 18, EGU2016-11129, 2016
EGU General Assembly 2016
© Author(s) 2016. CC Attribution 3.0 License.

The Lusi eruption and implications for understanding fossil piercement structures in sedimentary basins

Henrik Svensen (1), Adriano Mazzini (1), Sverre Planke (1,2), and Soffian Hadi (3)

(1) Center for Earth Evolution and Dynamics (CEED), University of Oslo, 0316 Blindern, Norway, (2) Volcanic Basin Petroleum Research, (3) BPLS, Suarabaya, Indonesia

The Lusi eruption started in northeast Java, Indonesia, on May 29th 2006, and it has been erupting rocks, mud, water, and gas ever since. We have been doing field work and research on Lusi ever since the eruption commenced. This work was initially motivated from studying the initiation of a mud volcano. However, the longevity of the eruption has made it possible to describe and monitor the lifespan of this unique piercement structure. . One of the first-order questions regarding the eruption is how it should be classified and if there are any other modern or fossil analogues that can place Lusi in a relevant geological context. During the initial stages of eruption, Lusi was classified as a mud volcano, but following geochemical studies the eruption did not show the typical CH4-dominated gas composition of other mud volcanoes and the temperature was also too high. Moreover, mud volcano eruptions normally last a few days, but Lusi never stopped during the past decade. In particular, the crater fluid geochemistry suggests a connection to the neighboring volcanic complex. Lusi represent a sedimentary hosted hydrothermal system. This opens up new possibilities for understanding fossil hydrothermal systems in sedimentary basins, such as hydrothermal vent complexes and breccia-pipes found in sedimentary basins affected by the formation of Large igneous provinces. We will present examples from the Karoo Basin (South Africa) and the Vøring Basin (offshore Norway) and discuss how Lusi can be used to refine existing formation models. Finally, by comparing Lusi to fossil hydrothermal systems we may get insight into the processes operating at depth where the Lusi system interacts with the igneous rocks of the neighbouring volcanic arc.

 

 

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