Integration loop of of ‘global offset’ seismic, continuous profiling magnetotelluric and gravity data

Dell’Aversana, Paolo

doi:10.3997/1365-2397.2003019

Cited by 17 publications

(23 citation statements)

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“…The top of IAP (orange lines) and the position of main reverse faults are extracted by the structural map in Figure . The four wells that constrain Figure 4a (red triangles) are redrawn from Dell'Aversana, .…”

Section: Inversion Resultsmentioning

confidence: 99%

“…Such velocity bumps correlate with wide anticlines of the Apulian reservoir drilled at about 2 km depth (bsl) under both basin‐bounding ridges (Figures a and b) and coherently follow the strike of the main reverse faults and ramp anticlines of the IAP belt (Figure a): NW‐SE trend on both sides of the basin rotating to NNW‐SSE in the northern part of the oilfield. The top of the IAP reported in Figure a is constrained by a prestack depth migrated section tied to four wells published by Dell'Aversana (). Such precise subsurface constrains enable straightforward comparison with the velocity field.…”

Section: Inversion Resultsmentioning

confidence: 99%

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Reservoir Structure and Wastewater‐Induced Seismicity at the Val d'Agri Oilfield (Italy) Shown by Three‐Dimensional V_p and V_p/V_s Local Earthquake Tomography

et al. 2017

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Wastewater injection into a high‐rate well in the Val d'Agri oilfield, the largest in onshore Europe, has induced swarm microseismicity since the initiation of disposal in 2006. To investigate the reservoir structure and to track seismicity, we performed a high‐spatial resolution local earthquake tomography using 1,281 natural and induced earthquakes recorded by local networks. The properties of the carbonate reservoir (rock fracturing, pore fluid pressure) and inherited faults control the occurrence and spatiotemporal distribution of seismicity. A low‐Vp, high‐Vp/Vs region under the well represents a fluid saturated fault zone ruptured by induced seismicity. High‐Vp, high‐Vp/Vs bumps match reservoir culminations indicating saturated liquid‐bearing zones, whereas a very low Vp, low Vp/Vs anomaly might represent a strongly fractured and depleted zone of the hydrocarbon reservoir characterized by significant fluid withdrawal. The comprehensive picture of the injection‐linked seismicity obtained by integrating reservoir‐scale tomography, high‐precision earthquake locations, and geophysical and injection data suggests that the driving mechanism is the channeling of pore pressure perturbations through a high permeable fault damage zone within the reservoir. The damage zone surrounds a Pliocene reverse fault optimally oriented in the current extensional stress field. The ruptured damage zone measures 2 km along strike and 3 km along dip and is confined between low permeability ductile formations. Injection pressure is the primary parameter controlling seismicity rate. Our study underlines that local earthquake tomography also using wastewater‐induced seismicity can give useful insights into the physical mechanism leading to these earthquakes.

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Section: Inversion Resultsmentioning

confidence: 99%

Section: Inversion Resultsmentioning

confidence: 99%

Reservoir Structure and Wastewater‐Induced Seismicity at the Val d'Agri Oilfield (Italy) Shown by Three‐Dimensional V_p and V_p/V_s Local Earthquake Tomography

et al. 2017

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“…Wells and seismic exploration profiles suggest that the thrust sheets located above the Apulia Platform could differently contribute to seismic anisotropy, depending on the local geological structure. To the NE of the Val d'Agri basin, rootless nappes mainly consist of Tertiary foredeep sediments (clayey deposits with limestone intercalation) and siliciclastic turbidites (Figs 3a and b;Menardi Noguera & Rea 2000;Dell'Aversana 2003). These sediments, that seal the Apulian reservoirs, show a bad attitude to seismic anisotropy.…”

Section: Discussion : S E I S M I C a N I S O T Ro P Y V E Rmentioning

confidence: 96%

“…The basin infill, that consists of continental deposits up to 500 m thick, is emplaced on a complex thrust-and-fold system (Fig. 3b) deeply explored by commercial reflection profiles and wells (Menardi Noguera & Rea 2000;Dell'Aversana 2003;Shiner et al 2004). Hydrocarbon exploration shows that the shallow architecture of the thrust-and-fold system derives from a poli-phase tectonic history (Menardi Noguera & Rea 2000;Shiner et al 2004;Catalano et al 2004).…”

Section: G E O L O G I C a L A N D S E I S M O L O G I C A L S E T T mentioning

confidence: 98%

Stress aligned cracks in the upper crust of the Val d'Agri region as revealed by shear wave splitting

Pastori

Piccinini

Margheriti³

et al. 2009

Geophysical Journal International

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S U M M A R YShear wave splitting is measured at 19 seismic stations of a temporary network deployed in the Val d'Agri area to record low-magnitude seismic activity. The splitting results suggest the presence of an anisotropic layer between the surface and 15 km depth (i.e. above the hypocentres). The dominant fast polarization direction strikes NW-SE parallel to the Apennines orogen and is approximately parallel to the maximum horizontal stress in the region, as well as to major normal faults bordering the Val d'Agri basin. The size of the normalized delay times in the study region is about 0.01 s km −1 , suggesting 4.5 per cent shear wave velocity anisotropy (SWVA). On the south-western flank of the basin, where most of the seismicity occurs, we found larger values of normalized delay times, between 0.017 and 0.02 s km −1 . These high values suggest a 10 per cent of SWVA.These parameters agree with an interpretation of seismic anisotropy in terms of the Extensive-Dilatancy Anisotropy (EDA) model that considers the rock volume pervaded by fluid-saturated microcracks aligned by the active stress field. Anisotropic parameters are consistent with borehole image logs from deep exploration wells in the Val d'Agri oil field that detect pervasive fluid saturated microcracks striking NW-SE parallel to the maximum horizontal stress in the carbonatic reservoir. However, we cannot rule out the contribution of aligned macroscopic fractures because the main Quaternary normal faults are parallel to the maximum horizontal stress.The strong anisotropy and the seismicity concentration testify for active deformation along the SW flank of the basin.

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“…the 1980 M s 6.9 Irpinia earthquake, Westaway & Jackson 1987; and the 1930 M w 6.5 Irpinia earthquake, Pino et al 2008). However, most of the seismicity is shallow, and we suppose that it occurs within the limestone of the Apulia Carbonate Platform, whose top has been drilled in this area between 2 and 4 km below sea level (Menardi Noguera & Rea 2000;Dell'Aversana 2003).…”

Section: Seismicity and Active Faultsmentioning

confidence: 96%

Active faults and induced seismicity in the Val d’Agri area (Southern Apennines, Italy)

Valoroso¹,

Improta²,

Chiaraluce³

et al. 2009

Geophysical Journal International

101

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S U M M A R YThe NW-SE trending Val d'Agri extensional basin is one of the regions in Italy with the highest seismogenic potential. Field data do not univocally define which of the fault systems bordering the basin on the two opposite sides is accommodating the active deformation. In this study, we detect and locate, by using an automatic picking procedure, almost 2000 low-magnitude earthquakes (−0.2 < M L < 2.7) recorded by a dense network during a 13-months-long seismic experiment. Events are mostly located along the southwestern flank of the basin. To the south, intense swarm-type microseismicity defines a major cluster ∼5 km wide from 1 to 5 km depth. To the west, a clear alignment of events, characterized by normal faulting kinematics, defines a NE-dipping normal fault between 1 and 6 km depth. The upward continuation of this structure, ∼5 km long, matches a mapped active normal fault recognized by field and palaeoseismological surveys.A temporal correlation found between the intense swarm-type microseismicity and the water level changes in the nearby artificial Pertusillo lake suggests that this seismicity is reservoir-induced.

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Integration loop of of ‘global offset’ seismic, continuous profiling magnetotelluric and gravity data

Cited by 17 publications

References 0 publications

Reservoir Structure and Wastewater‐Induced Seismicity at the Val d'Agri Oilfield (Italy) Shown by Three‐Dimensional V_p and V_p/V_s Local Earthquake Tomography

Reservoir Structure and Wastewater‐Induced Seismicity at the Val d'Agri Oilfield (Italy) Shown by Three‐Dimensional V_p and V_p/V_s Local Earthquake Tomography

Stress aligned cracks in the upper crust of the Val d'Agri region as revealed by shear wave splitting

Active faults and induced seismicity in the Val d’Agri area (Southern Apennines, Italy)

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Integration loop of of ‘global offset’ seismic, continuous profiling magnetotelluric and gravity data

Cited by 17 publications

References 0 publications

Reservoir Structure and Wastewater‐Induced Seismicity at the Val d'Agri Oilfield (Italy) Shown by Three‐Dimensional Vp and Vp/Vs Local Earthquake Tomography

Reservoir Structure and Wastewater‐Induced Seismicity at the Val d'Agri Oilfield (Italy) Shown by Three‐Dimensional Vp and Vp/Vs Local Earthquake Tomography

Stress aligned cracks in the upper crust of the Val d'Agri region as revealed by shear wave splitting

Active faults and induced seismicity in the Val d’Agri area (Southern Apennines, Italy)

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Product

Resources

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Reservoir Structure and Wastewater‐Induced Seismicity at the Val d'Agri Oilfield (Italy) Shown by Three‐Dimensional V_p and V_p/V_s Local Earthquake Tomography

Reservoir Structure and Wastewater‐Induced Seismicity at the Val d'Agri Oilfield (Italy) Shown by Three‐Dimensional V_p and V_p/V_s Local Earthquake Tomography