Well Log Sequence Stratigraphy - Preamble
1• Introduction to Sequence Stratigraphy with Well Logs: the first steps in the use of well logs to build sequences stratigraphic models of depositional system. 2• Well Log Suites: brief description of how different types of well log are used to interpret sedimentary geology. 3• Well Log Response Character: explanation of the use of the shapes of well log curves to track changes in mineral content, and grain size and so interpret sedimentary geology. 4• Well Log Stacking Patterns: explanation of how aggradational, retrogradational and progradational stacking patterns identified on well logs can be used to interpret sedimentary depositional settings.
1• Introduction to Sequence Stratigraphy with Well Logs: the first steps in the use of well logs to build sequences stratigraphic models of depositional system.
2• Well Log Suites: brief description of how different types of well log are used to interpret sedimentary geology.
3• Well Log Response Character: explanation of the use of the shapes of well log curves to track changes in mineral content, and grain size and so interpret sedimentary geology.
4• Well Log Stacking Patterns: explanation of how aggradational, retrogradational and progradational stacking patterns identified on well logs can be used to interpret sedimentary depositional settings.
1• The Geologic setting of the La Pascua Formation - Guarico Sub-Basin: general geological setting of the nearshore clastics of the Lower Oligocene La Pascua formation of the Las Mercedes Field in the West Guarico Block, Venezuela, their lithology, relationship to sea level and plate tectonic setting. 2• Introduction to Sequence Stratigraphy of the La Pascua Formation - Guarico Sub-Basin: first steps in the use of well logs to build sequences stratigraphic models of clastic shoreline depositional systems for the Lower Oligocene La Pascua formation of the Las Mercedes Field in the West Guarico Block, Venezuela. Exercise 1 - Well log correlation using SP & RES logs: interpretation of local north eastern Venezuelan clastic stratigraphy using three wells (W-1, W-2, W-3) that penetrate the Lower Oligocene La Pascua formation of the Las Mercedes Field in the West Guarico Block. Exercise 2 - Well log correlation using SP & RES logs: interpretation of local north eastern Venezuelan stratigraphy and identification of a clastic sequence in an incised valley using 10 wells (W-1 to W-10) that penetrate the Lower Oligocene La Pascua formation of the Las Mercedes Field in the West Guarico Block. Exercise 3 - Well log correlation using SP & RES logs: interpretation of local north eastern Venezuelan stratigraphy and identification of a clastic sequence of an incised valley, and its relationship to sea level from 22 wells (W-1 - W-22) that penetrate in the Lower Oligocene La Pascua formation of the Las Mercedes Field in the West Guarico Block. Exercise 4 - Well log correlation using SP & RES logs: interpretation of local north eastern Venezuelan stratigraphy and identification of a clastic sequence of an incised valley, and its relationship to sea level from 5 Wells (me333, me296, me428, me313 and me 486) within the central portion of the Northern Strike Line that penetrate in the Lower Oligocene La Pascua formation of the Las Mercedes Field in the West Guarico Block. Exercise 5 - Well log correlation using SP & RES logs: interpretation of local north eastern Venezuelan stratigraphy and identification of the clastic coastal and incised valley sequences, and their relationship to sea level from wells that penetrate in the Lower Oligocene La Pascua formation of the Las Mercedes Field in the West Guarico Block on a North-South Dip line , a Northern Strike Line and a Southern Strike Line. Solutions for Exercise 1, 2, 3, 4 and 5: interpretation of well log cross-sections of coastal sedimentation and incised valley fill explained with a movie of the evolving clastic sequences. 3• References: References for the interpretation of Well logs and References for the Guarico Sub-basin geological framework and regional stratigraphy.
1• The Geologic setting of the La Pascua Formation - Guarico Sub-Basin: general geological setting of the nearshore clastics of the Lower Oligocene La Pascua formation of the Las Mercedes Field in the West Guarico Block, Venezuela, their lithology, relationship to sea level and plate tectonic setting. 2• Introduction to Sequence Stratigraphy of the La Pascua Formation - Guarico Sub-Basin: first steps in the use of well logs to build sequences stratigraphic models of clastic shoreline depositional systems for the Lower Oligocene La Pascua formation of the Las Mercedes Field in the West Guarico Block, Venezuela.
3• References: References for the interpretation of Well logs and References for the Guarico Sub-basin geological framework and regional stratigraphy.
1) Introduction to high frequency Carbonate Sequence Stratigraphy: an explanation of why cycles and parasequences are used to study ancient carbonate systems 2) Correlation of cycles and/or sequence parasequences; cycles and/or parasequence sets; and systems tracts in the Hanifa formation: based on stacking patterns & log character. A description of the surfaces that bound and subdivide parasequences and how they are identified on well logs. How to construct Fischer Diagrams. Exercise 1: Introduction to parasequence identification on the basis of the lithologies within cored wells. Well # 1 penetrates a shallow shelf region and Well # 2 a deeper region. Exercise 2: Four well logs correlated using a combination of well logs and cores to identify the major <stratigraphic surfaces and parasequence stacking patterns that are tied from well to well. Exercise 3: The use of 14 (Fourteen) well logs to make a regional sequence stratigraphic interpretation of facies geometries by identifying major surfaces, establishing the lithofacies, building a Fisher diagram. Exercise 4: Improve high frequency cycle correlation using the Fischer Diagram. 3) A well log cross-section across the margin of "NE shelf of the Delaware Basin of the Permian Basin" in New Mexico and the NW flank of the Central basin Platform (After Harris & Saller 1999). Exercise 1: Introduction to cycle (and/or ParaSequence) identification on the basis well logs to identify the major stratigraphic surfaces and cycle (and/or parasequence) stacking patterns Exercise 2: Well logs correlated using a combination of well logs and seismic tied to synthetic to identify the geometry of major stratigraphic surfaces and cycle (and/or parasequence) stacking patterns that are tied from well to well. Exercise 3: Fill in details of lithofaceis on partly interpreted well log section with information gleaned from interpreted seismic and establish cycle (and/or parasequence) stacking patterns that are tied from well to well. 4) "Beltzaren Lurraldean Field in NW Syldavia" (After Hergé 1939). Exercises that introduce high frequency carbonate sequence stratigraphy with an "hypothetical" example: introduction to use of well log interpretation of carbonates using awell-log section across the imaginary Ordovician carbonate margin of the Beltzarin basin. Exercise 1: Introduction to surfaces and parasequence stacking patterns tied from well to well. Exercise 2: Well logs correlated using a combination of well logs and cores to identify the major stratigraphic surfaces and cycle (and/or parasequence) stacking patterns that are tied from well to well.
1) Introduction to high frequency Carbonate Sequence Stratigraphy: an explanation of why cycles and parasequences are used to study ancient carbonate systems
2) Correlation of cycles and/or sequence parasequences; cycles and/or parasequence sets; and systems tracts in the Hanifa formation: based on stacking patterns & log character. A description of the surfaces that bound and subdivide parasequences and how they are identified on well logs. How to construct Fischer Diagrams.