Construction of coherent 3D geological blocks

MO, None GALERA, CYRIL, C. BENNIS, and I.; Bennis, Chakib; Moretti, Isabelle; Mallet, Jean-Laurent

doi:10.1016/s0098-3004(03)00085-2

Cited by 49 publications

(18 citation statements)

References 19 publications

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“…The objective to apply our methods is to avoid lateral deformation due to the influence of the setting up of complex fault network as presented in [2] and [3]. Then, the original distance between geological bodies will be restored as it was historically and the computed geostatistical parameters will be more consistent.…”

Section: Resultsmentioning

confidence: 99%

Isometric Unfolding of Stratigraphic Grid Units for Accurate Property Populating – Mathematical Concepts

Horna¹,

Bennis²,

Borouchaki³

et al. 2010

Proceedings

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In traditional methods used to populate stratigraphic units, the distortions can be very important and affect the setting up of the static and dynamic parameters necessary to the reservoir simulation, hence the simulation results. These distortions result from the mapping between the original curvilinear stratigraphic grid and the intermediate cartesian grid in which the property populating is processed.To minimize the deformation and improve the populating process, we propose a new original isometric unfolding process based on the minimization of the elastic tensor deformation. This method could be applied for every type of deposit: horizontal, parallel to top, parallel to bottom, proportional.Starting from a structural model defined into a coordinate line grid, the user chooses a reference iso-chronological level represented by a triangulated surface. This level can be the top, the bottom or any other characteristic surface of a litho stratigraphic unit. The contacts between this surface and fault surfaces are explicitly extracted as coincident edges. These coincident edges are used to constraint an unfolding process which minimizes the elastic deformation tensor on the whole surface and then, respecting the above constraints, join the fault lips opened by geological tectonic events.To exploit this first 2D Unfolding for volumetric purposes, we use the coordinate line grids as a 3D support and define a complete mapping between the original curvilinear structural grid and its image in the deposition (unfolded) domain. This mapping which expresses the geometrical transformation between the today's world and the depositional period could now be used to transport today's well trajectory stations in the unfolded volume for geostatistical computation and, on the way back, define the geometrical relations needed for upscaling.In this paper we will focus on mathematical concepts of the algorithms used in the whole unfolding process and present some results throw actual case studies. Main Objectives:Present the mathematical concept and methodology for a new unfolding method based on the minimization of the elastic tensor deformation. With this method, we will be able to associate to a stratigraphic grid unit in structural position to its cell to cell image in the depositional space. This mapping could be used to transport well trajectory stations in the unfolded volume for geostatistical computation. New aspects covered :We propose a new original isometric unfolding process based on the minimization of the elastic tensor deformation. We apply this algorithm to unfold iso-chronological surfaces and to unfold volumes in several depositional modes: Top and bottom conformable, proportional and parallel to any surface.

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Section: Resultsmentioning

confidence: 99%

Isometric Unfolding of Stratigraphic Grid Units for Accurate Property Populating – Mathematical Concepts

Horna¹,

Bennis²,

Borouchaki³

et al. 2010

Proceedings

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“…Figure 20 is a U3D model that can be embedded in the pdf of the paper, which shows interactively what has been explained throughout this paper. This method could be also used to model larger ore deposits or even regional scale geological seams, such as the ones shown in [21].…”

Section: Discussionmentioning

confidence: 99%

“…• A minimum thickness can be defined according to mining technical conditions. This method could be also used to model larger ore deposits or even regional scale geological seams, such as the ones shown in [21]. …”

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confidence: 99%

Resource and Reserve Calculation in Seam-Shaped Mineral Deposits; A New Approach: “The Pentahedral Method”

et al. 2017

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Abstract:In recent years, the introduction of specific software for the evaluation of geological resources and mineral reserves has increased significantly thanks to the use of block models capable of working with large databases and applicable to virtually all types of deposits. It is only in layered, tabular-shaped deposits where the use of block models poses certain drawbacks, not only in terms of visual representation but also during the process of interpolation. Other calculation methods for tabular bodies such as sections, polygons, and triangles work with 2D projections but not with 3D. The "Pentahedral" method described here is undoubtedly an innovative method that allows work to always be conducted in 3D, providing a fairly accurate representation of tabular bodies and making it possible to carry out calculations of resources and reserves using any interpolation method. It is demonstrated with figures and tables of the Carlés mineral deposit, a well-developed exoskarn gold deposit in northwestern Spain (Asturias) where the authors have worked extensively. The pentahedral method takes into account not only geological and stratigraphic data from the model interpolation, but also mining concepts such as "minimum thickness," related to the minimum seam size that can be economically and technically mined, and "overbreak," related to the dilution effect that appears during the mining process due to over-excavation.

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“…-the meth od ol ogy of con struct ing a 3D geo log i cal model based on var i ous in put data (Mal let 1992(Mal let , 1997(Mal let , 2002de Kemp, 1999de Kemp, , 2000Husson and Mugnier, 2003;Lemon and Jones, 2003;Maxelon and Mancktelow, 2005;Sprague and de Kemp, 2005;Dhont et al, 2005;de Kemp et al, 2006;Zhu et al, 2006;Frank et al, 2007;Caumon et al, 2009;Zanchi et al, 2009); -mod el ling of re gional geo log i cal struc tures (Ledru, 2001 and ref er ences therein; Courrioux et al, 2001;Galera et al, 2003;Wu et al, 2005;Zanchi et al, 2009;Snidero et al, 2011;Popovs et al, 2015); -mod el ling of lo cal struc tures and/or min eral de pos its (Fernán dez et al, 2004;Kaufmann and Mar tin, 2008;Wycisk et al, 2009;Schetsellar, 2013;Vanneschi et al, 2014, Martin-Izard et al, 2015Basson et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

High-resolution 3D geological model of the bauxite-bearing area Crvene Stijene (Jajce, Bosnia and Herzegovina) and its application in ongoing research and mining

Pavičić

Dragičević

Ivkić

2018

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1 Uni ver sity of Zagreb, Fac ulty of Min ing, Ge ol ogy and Pe tro leum En gi neer ing, De part ment of Ge ol ogy and Geo log i cal En gi neer ing, Pierottijeva 6, 10000 Zagreb, Croatia Pavièiae, I., Dragièeviae, I., Ivkiae, I., 2018. High-res o lu tion 3D geo log i cal model of the baux ite-bear ing area Crvene Stijene (Jajce, Bosnia and Herzegovina) and its ap pli ca tion in on go ing re search and min ing. Geo log i cal Quar terly, 62 (1): 100-119, doi: 10.7306/gq.1396Three-di men sional (3D) geo log i cal mod els are use ful tools in var i ous geo log i cal, min ing and other en gi neer ing ac tiv i ties.Geo log i cal model shows strati graphic, struc tural and lith o logic set tings of the study area in 3D space, and serves as a 3D geodatabase for a va ri ety of in put data. The study area is one of the baux ite-bear ing sites, Crvene Stijene, near Jajce (Bosnia and Herzegovina). Dur ing the last de cades, a num ber of geo log i cal, geo detic, min ing and other data were col lected through in ten sive geo log i cal re search and min ing (ex plo ra tion), with the aim of find ing and ex ploit ing baux ite de pos its. There fore, se lected area is a great poly gon for the im ple ment ing and test ing of workflow for the con struc tion of a 3D geo log ical model of baux ite-bear ing field and its ap pli ca tion in cur rent and fu ture re search and min ing. Pre sented workflow in cludes col lec tion, dig i ta li za tion, or ga ni za tion and vi su al iza tion for dif fer ent types of ex ist ing and new data (600 bore holes, geo log ical maps and cross-sec tions, DEM, struc tural mea sure ments from the sur face, as well as in tun nels and adits) in 3D geo log ical da ta base. For this study, dif fer ent types of geo log i cal ob jects, fault planes and geo log i cal sur faces were mod elled with dif fer ent in ter po la tion al go rithms. The con structed model is in ter ac tive and it can be eas ily up dated by new in put data from cur rent re search and ex ploi ta tion ac tiv i ties: bore holes, un der ground min ing ob jects, etc. The 3D geo log i cal model rep resents a rel e vant foun da tion for plan ning new re search and min ing ac tiv i ties. Fur ther more, newly found de pos its and their volumes can be quickly mod elled, con toured and cal cu lated. Pre sented mod el ling workflow is ap pli ca ble to other ar eas and other min eral re sources.

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Construction of coherent 3D geological blocks

Cited by 49 publications

References 19 publications

Isometric Unfolding of Stratigraphic Grid Units for Accurate Property Populating – Mathematical Concepts

Isometric Unfolding of Stratigraphic Grid Units for Accurate Property Populating – Mathematical Concepts

Resource and Reserve Calculation in Seam-Shaped Mineral Deposits; A New Approach: “The Pentahedral Method”

High-resolution 3D geological model of the bauxite-bearing area Crvene Stijene (Jajce, Bosnia and Herzegovina) and its application in ongoing research and mining

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