Exploration Insights September 2020 - Page 7

Exploration Insights | 7 Range (m) 0–10 10–50 50–100 100+ Source rock thickness Index value 0.25 0.5 0.75 Table 1> Example of threshold values used to define the numerical index score applied to one component of a petroleum system; in this case, source rocks thickness. of these thresholds for source rock thickness. The full implementation of this schema to the Woodford petroleum system of the Permian Basin can be seen in Figure 2B. In this schema, an individual element or process may have several attributes that need to be considered (Figure 2B). In such cases, the index score is an average for that element. Similarly, index scores can be averaged at the process and element level, or averaged for the petroleum system as a whole. In this way, the schema is hierarchical and enables analysis across the range of levels. Specific comparisons can be made for an individual element or process (e.g. reservoir), or petroleum systems can be compared using a holistic index score that accounts for all the elements and processes. GATHERING A GLOBAL DATASET The workflow for populating the data used to calculate index scores can be broken down into a number of key steps, depicted in Figure 3. Three approaches were used to aggregate information at the petroleum system level. In 1 © 2020 Halliburton each case, the chosen approach reflected how well the input dataset was structured, and the nature of the information. The following methods were employed: »» Automated extraction and aggregation of data from existing digital databases »» Extrapolation of models for the stratigraphic extent of petroleum system elements from the suite of Neftex Gross Depositional Environment maps »» Capture of knowledge from regional experts Together, these methods of data collection delivered a comprehensive resource for the integrated assessment of petroleum systems. The data-gathering effort was conducted globally, in each basin constrained by a Neftex Play Cross Section. We used the data we collected to power a visualization dashboard, where information can be displayed and filtered both geographically and stratigraphically. The dashboard also displays the locations of basins and play cross sections. It can be used to discriminate between the different qualities of petroleum systems elements and processes at each level of the hierarchy (Figure 1). These new data and the insights they provide will be accessible via a number of updates to the cloud-hosted PlayFinder dashboard linking the petroleum system assessments to their plays. These updates will be available to subscribers later in 2020. Extract and populate data Design analytical schema Aggregate digital data at a petroleum system level Interpolate data from digital products Capture knowledge from domain experts Field, play, stratigraphy Mapped extent or qualities of petroleum system element Nature of charge systems, estimates of uplift, etc. Aggregate database Design and build dashboard Apply matrix schema Publish dashboard to cloud Assess, evaluate and compare petroleum systems © 2020 Halliburton Figure 3> A simplified workflow for populating and evaluating the impact of the holistic petroleum systems index defined in this work.