Geological model of the central Periadriatic basin (Apennines, Italy)Marine and Petroleum Geology

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Authors
S. Bigi, A. Conti, P. Casero, L. Ruggiero, R. Recanati, L. Lipparini
Year
2013
DOI
10.1016/j.marpetgeo.2012.07.005
Subject
Economic Geology / Geology / Geophysics / Oceanography / Stratigraphy

Text

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Keywords: 3D modeling m ol t ctly r 3D m ers) ha grating geophysical and geological data, from seismic available database and by geological maps, is possible to define geometrical and geological constraints in order to create 3D surfaces, closed volumes and grids from the constructed objects. model. We applied this approach to a wide sector of the Periadriatic

Basin, between Ascoli Piceno to the north and Pescara to the south, at the front of the Apennines thrust belt system (Fig. 1). In this area, which has an extension of about 8000 kmq, an extensive oil exploration activity has been carried out since ’70e’80, and, as a consequence, the related seismic dataset is wide and mostly available, although not always of high quality (Videpi Project, 2009) (Fig. 2).

The structural setting of this area is the combination of extremely superficial thrust-related anticlines and their respective * Corresponding author.

E-mail addresses: alessia.conti@uniroma1.it (A. Conti), caseropiero@libero.it

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Marine and Petroleum Geology 42 (2013) 107e121(P. Casero).in the Earth Sciences, leading to a more accurate spatial analysis of geological structure and to 3D models. Numerous papers deal with the integration of different kind of data for a 3D reconstruction of subsurface structures at a regional scale (Ledru, 2001 and references therein; Courrioux et al., 2001; Galera et al., 2003; Wu et al., 2005; Zanchi et al., 2009; Salvi et al., 2010). The subsurface data generally used for 3D reconstruction are the seismic data, integrated with well data log, techniques that has its maximum development in the hydrocarbon research (Fonnesu, 2000;

Zampetti et al., 2004; Gee et al., 2007; among many others). Intedataset.

The workflow followed three main steps. The first one was the construction of a digital database in a GIS environment, followed by the2D interpretationof each seismic line;finallywebuilt themain3D stratigraphic and tectonic surfaces, working in a 3D space where the depth is expressed in TWT time. The depth conversion and restoration has beenperformed in 2D, along themost representative section derived from the 3D model. Most of the work was carried out with

Kingdom 8.4 (Seismic Micro-Technology) for the seismic interpretation andMove 2011 (Midland Valley) for the reconstruction of the 3DStructural geology

Seismic lines

Seismic stratigraphy

Fold-and-thrust belt

Anticlines

Thrust basin 1. Introduction

The development of software fo

Vision, Move, Petrel amongmany oth0264-8172/$ e see front matter  2012 Elsevier Ltd. http://dx.doi.org/10.1016/j.marpetgeo.2012.07.005belt is mostly buried under a syn- and post-orogenic, PlioePleistocene, siliciclastic sequence. The 3D model allowed us to correlate themain thrust fronts and related anticlines along strike, revealing a general ramp e flat e ramp trajectory characterizing the main structural trends. This geometric organization influences the sequence of thrust-system propagation and characterizes the evolution of syntectonic basins. The obtained 3D model points out several variation occurring along strike: i) main trends geometric relationships; ii) deformation chronology and iii) displacement distribution. In the northern sector, higher displacement and structural elevation are reached out by the NeretoeBellante structure, whereas in the southern sector the VilladegnaeCostiera Structure is the prevalent. All structures show a diachronic thrusts activity along strike, younger toward the north.  2012 Elsevier Ltd. All rights reserved. odeling (gOcad, Earth s opened a new frontier

In this work, we integrated 2D reflection seismic dataset, geological maps and borehole data to reconstruct the buried structures; this procedure provided the generation of 3D surfaces taking into account any geometrical constraint derived from theAvailable online 21 August 2012 constrained by wells data and surface geology. The methodology was applied in the MarcheeAbruzzi sector of the Periadriatic basin, where the more external part of the Apennines fold-and-thrust23 July 2012

Accepted 27 July 2012 surfaces in three dimensions through the interpolation of closely and regularly spaced 2D seismic sections,Geological model of the central Periadr

S. Bigi a, A. Conti a,*, P. Casero b, L. Ruggiero a, R. Rec aDepartment of Earth Science, Sapienza University of Rome, P.le A. Moro 5, 00185 Rom bVia S. Martino Valperga 20, Roma, Italy cMedoilgas Italia S.p.A Via Cornelia n. 498, 00166 Rome, Italy a r t i c l e i n f o

Article history:

Received 8 February 2012

Received in revised form a b s t r a c t 3D geological models fro outcrops) are a critical to structures that are not dire journal homepage: www.elAll rights reserved.ic basin (Apennines, Italy) ati c, L. Lipparini c ly multi-source data (cross-sections, geological maps, borehole logs and o improve the interpretation of the spatial organization of subsurface accessible. In this paper, we reconstruct the main geological structures and

SciVerse ScienceDirect leum Geology vier .com/locate/marpetgeo leumS. Bigi et al. / Marine and Petro108deeper ramps, buried under syn- and post-orogenic, PlioPleistocene, siliciclastic sequences (Artoni and Casero, 1997;

Argnani and Frugoni, 1997; Bigi et al., 2004; Carruba et al., 2006;

Tozer et al., 2006).

A general evolution of the Periadriatic basin has been proposed, among many others, by Ori et al. (1991), Crescenti et al. (2004),

Artoni (2007). Following Ori et al. (1991), the complex evolution of the Adriatic foredeep can be resumed in four stages: during the

Messinian stage, the first one, the area was a typical foredeep basin (sensu DeCelles and Giles, 1996) where a single basin lie parallel to the structural axes of the mountain chain; the same basin was affected during the Early Pliocene by thrusting and a more internal and uplifted zone, still connected to the main basin, called “open piggy back basins” was defined. The third stage, in the Middlee