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By G P Goffey, J Craig, T Needham, R Scott

Onshore fold-thrust belts are normally perceived as 'difficult' areas to probe for hydrocarbons and are as a result frequently refrained from. notwithstanding, those belts host huge oil and fuel fields and so those limitations to powerful exploration suggest that gigantic unexploited assets may perhaps stay. over the years, assessment innovations have more advantageous. it's attainable in definite conditions to accomplish stable 3D seismic information. Structural recovery concepts have moved into the 3D area and more and more refined palaeo-thermal symptoms let larger modelling of burial and uplift evolution of resource and reservoirs. understanding of the impact of pre-thrust constitution and stratigraphy and of hybrid thick and thin-skinned deformation kinds is augmenting the simplistic geometric versions hired in past exploration. yet growth is a gradual, dear and iterative strategy. and academia have to collaborate with a purpose to enhance and constantly increase the mandatory figuring out of subsurface geometries, reservoir and cost evolution and timing; this booklet bargains papers on particular innovations, outcrop and box case studies.The Geological Society of LondonFounded in 1807, the Geological Society of London is the oldest geological society on the earth, and one of many greatest publishers within the Earth sciences.The Society publishes quite a lot of fine quality peer-reviewed titles for lecturers and execs operating within the geosciences, and enjoys an enviable foreign acceptance for the standard of its work.The many components during which we post in include:-Petroleum geology-Tectonics, structural geology and geodynamics-Stratigraphy, sedimentology and paleontology-Volcanology, magmatic reports and geochemistry-Remote sensing-History of geology-Regional geology publications

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The Darai Limestone duplex exposed at surface represents considerable shortening in the Darai Limestone and upper Ieru Formation. Below, or to the NE, this must be balanced by equivalent shortening in the lower Ieru Formation to Koi-Iange Formation. On the cross section, this has been represented as a simple duplex forming the Mount Castle and Wage anticlines. However, numerous other interpretations are possible, including basement involvement. A recently acquired regional seismic line across these structures may resolve the subsurface geometry.

Chamberlain, R. L. 1995. Eastern Cordillera of Colombia: Jurassic– Neogene Crustal Evolution. , Suarez Soruco, R. & Welsink, H. (eds) Petroleum Basins of South America, AAPG Memoir 62, 633 –646. , Gou, Y. & Subieta, T. 1994. Geometry and kinematics of the North Monagas thrust belt (Venezuela). Marine and Petroleum Geology, 11, 347– 362. , Huber, K. & Mueller, M. 1995. Tektonik und regionale Geologie der Gesteine der Tiefbohrung Hindelang 1 (Allga¨uer Alpen). Geologica Bavarica, 100, 75–115, Mu¨nchen.

The bulk of the section results from structural interpretation of well and surface data. The lowermost section, at half-scale, shows a restoration of the Gently Folded and Strongly Folded Belts such that the shortening has not yet propagated over the hypothetical graben containing source rocks. See Figure 1 for location and text for detailed discussion. STRUCTURAL STYLES IN THE PAPUAN FOLD BELT 37 Fig. 3. 38 K. C. HILL ET AL. Fig. 4. (a) Location map of regional seismic lines across the Vulcan Sub-Basin in the Timor Sea, along strike to PNG.

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