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FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil Product: Prediction of Rock Types –Sand within reservoir intervals –Shale in overlying seal.

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Presentation on theme: "FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil Product: Prediction of Rock Types –Sand within reservoir intervals –Shale in overlying seal."— Presentation transcript:

1 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil Product: Prediction of Rock Types –Sand within reservoir intervals –Shale in overlying seal intervals & source intervals Seismic Stratigraphic Analysis –Define key stratigraphic intervals –Determine the rock types within each interval What Is Seismic Facies Analysis? Input: Seismic Data (2D or 3D) Seismic Sequence Analysis Seismic Facies Analysis

2 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil Definitions Seismic Facies UnitSeismic Facies Unit –a mappable, three dimensional seismic unit composed of groups of reflections whose parameters differ from those of adjacent facies units. Seismic Facies AnalysisSeismic Facies Analysis –the description and geologic interpretation (environmental setting, lithofacies, etc.) of seismic reflection parameters. Mitchum et al., 1977a

3 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil Reflection Features Used in Mapping Feature Significance Reflection Geometry Depositional Processes Bed Thickness Fluid Content Wavelet Frequency Lateral Stratal Continuity Depositional Processes Reflection Continuity Impedance Contrasts (significant stratal surfaces) Bed Spacing / Tuning Fluid Content Seismic Amplitude

4 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil Seismic Facies Analysis Seismic Sequence Analysis Seismic Facies Analysis Key Stratigraphic Units Are Broken Out Interpretation/Prediction Patterns are used to Interpret EODs Lithologies / stacking are predicted Geometric Relations are Captured through ABC Mapping Other Seismic Features are Extracted as Seismic Attributes CarbonateShelf ShelfEdgeReef Carb.Slope Mitchum et al., 1977b AAPG©1977reprinted with permission of the AAPG whose permission is required for further use.

5 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil Posting Geometric Observation The ABC Method A - B A - BC C A = Termination Pattern at the Upper Sequence Boundary B = Termination Pattern at the Lower Sequence Boundary C = Internal Reflection Pattern Tr = Truncation Tp = Toplap C = Concordant On = Onlap Dn = Downlap C = Concordant p = parallelm = mounded ob = oblique progradation sub = subparallelw = wavy sig = sigmoid progradation div = divergentrf = reflection free sh = shingled

6 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil Internal Reflection Patterns Parallel Subparallel Divergent Complex For examples, see AAPG Memoir 26 Stratified ProgradationalSimple Unstratified Sigmoid Oblique Combination Shingled Mounded Hummocky Deformed Chaotic Reflection Free

7 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil Simple Stratified Internal Configurations Subparallel Divergent Parallel - Even Complex Stratified Progradational Simple

8 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil Progradational Internal Configurations ObliqueSigmoid Upbuilding (Aggradation) Outbuilding (Progradation) Complex Stratified Progradational Simple Shingled

9 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil Mounded Complex Internal Configurations HummockyDeformed Complex Stratified ProgradationalSimple

10 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil Line B The Classic Method - An Example Each Line is Subdivided into Seismic Facies Units where Each Unit Differs from its Neighbors Here Facies Units are based on Reflection Geometries C -On P T -C Ob T -Dn Ob C -Dn P C -C P

11 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil ABC Codes Posted on a Map Line B 20 Line C Line A T -Dn Ob C -On P T -C Ob C -Dn P C -C P C -C P C -Dn P T -Dn Ob T -C Ob C -On P C -C P T -C Div

12 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil Facies Synthesis Line B Line C Line A C -On P T -C Ob C -Dn P C -C P T -Dn Ob C -C P C -Dn P T -Dn Ob T -C Ob C -On P C -C P T -C Div Line B Line C Line A C -On P T -C Ob C -Dn P C -C P T -Dn Ob C -C P C -Dn P T -Dn Ob T -C Ob C -On P C -C P T -C Div Zone of Progradation Last Shelf Margin 30 Line B Line C Line A C -On P C -On P C -C P Wedge C -C P C -C P Sheet

13 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil Basin Slope Marginal Marine Non-Marine Line B Line C Line A Depositional Environments

14 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil Inferred Lithology - Prediction Prediction Crevasse Splay Channel Fill Proximal Distributary Mouth Bar Distal Distributary Mouth Bar Prodelta Delta Front Facies Model Delta Front Sandstone Delta Front Siltstone Pro-Delta Shales Offshore Clay Sea Level

15 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil Time for Another Exercise Woodbine: Onshore East Texas Ramsayer, 1979 Line 1 Line 1a OTC©1979 reprinted with permission of the OTC whose permission is required for further use.

16 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil Line 1 Well CWell D Ramsayer, 1979 OTC©1979 reprinted with permission of the OTC whose permission is required for further use.

17 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil ABC-Coded Map Ramsayer, 1979 Well C Well D OTC©1979 reprinted with permission of the OTC whose permission is required for further use.

18 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil C-On Thin Tp-Dn Ob C-Dn P ABC Synthesis Well C Well D Ramsayer, 1979 OTC©1979 reprinted with permission of the OTC whose permission is required for further use.

19 FWS 04 L 11 – Stratigraphic Analysis Courtesy of ExxonMobil Interpreted Depositional Environments Fluvial & Delta Plain Delta Plain Slope Delta Ramsayer, 1979 OTC©1979 reprinted with permission of the OTC whose permission is required for further use.


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