Area-Depth-Strain Extended Overview

00:00 – Introduction This video introduces area-depth-strain analysis for seismic interpreters and places it within the broader StructureSolver workflow. The focus is on extracting quantitative structural information directly from interpreted geometry. 01:02 – Goals of Area-Depth Analysis This section outlines the main objectives of area-depth-strain analysis, including estimating detachment depth, fault geometry, displacement, and internal strain. It also highlights how the method complements other structural tools and supports quality control of seismic interpretations. 03:10 – Principles of Area-Depth Analysis This section explains how fold areas are plotted as a function of depth on an area-depth graph. We show how linear trends are used to estimate detachment depth and displacement from interpreted horizons. 05:28 – Area-Depth Graph Usage and Interpretation This section explains how fold areas are plotted as a function of depth on an area-depth graph. We show how linear trends are used to estimate detachment depth and displacement from interpreted horizons. 07:37 – Application to Extensional Fault Kinematic Models Area-depth analysis is applied to an extensional forward model to demonstrate how displacement and detachment depth are recovered from fold geometry. The example illustrates how the method works in practice using regional depth references. 11:31 – Example: Area-Depth Analysis (Sierra Pampeanas, Argentina) This example applies area-depth analysis to a basement-involved fault propagation fold. We introduce the fault-trajectory method and show how detachment depth, fault dip, displacement, and layer-parallel strain can be estimated from incomplete interpretations. 26:30 – Example: Strain Analysis (Niger Delta) This section focuses on using area-depth analysis to distinguish pregrowth and growth strata and to reconstruct displacement history. Differences between constant-area displacement and bed-length estimates are used to quantify internal strain. 36:18 – Example : Salt Tectonics (Keathley-Walker Fault Belt) We explore how salt migration affects area-depth results and how deviations from expected detachment depth can be interpreted. The method is used to estimate salt redistribution and to assess interpretation consistency in salt-influenced systems. 45:22 – Case Study Mexican Ridges Fold Belt The area-depth method is applied in a regional structural context involving linked extensional and contractional systems. The case study demonstrates how area-depth analysis complements forward modelling and helps resolve displacement balance in complex tectonic settings.