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Abstract The global workflow of Light-Up Light-Up (for Light Uncertainty Process) is part of TOTAL's in-house tools for uncertainty management. Light-Up provides (1) the assessment of the probabilized HIIP distribution and (2) the methodology and tool to build "tailor-made" models that feed fluid flow simulation for reserves evaluation with or without dynamic uncertainties. Because the uncertainty workflow of Light-Up is pragmatic and fast, Light-Up has been used for several years on a large panel of TOTAL operational cases. The uncertainty workflow which includes Light-Up, composed of 4 main steps, constitutes an integrated workflow. 1. BASIC DATA Firstly, the selection of the Base Case geomodel is performed through an in-house non-ergodicity diagnosis. Once uncertainty ranges of static parameters (such as fluid contact, structure, facies proportions, geobody extension and petrophysics) are defined, mono-sensitivity runs are conducted and HIIP is computed for each run. A Tornado Chart is then built to rank the uncertainty level of key parameters on HIIP. 2. STATIC ASPECT Then, an innovative in-house formula combined with Monte Carlo runs within the Tornado Chart allows computing the probabilized HIIP distribution with the determination of Q10, Q50 and Q90 volumes as well as its dispersion. 3. DYNAMIC ASPECT Secondarily, because dynamic uncertainties studies for reserves and resources estimation (lead by EST) need to be fed with alternative models (called "tailor-made" models), Light-Up provides a robust methodology and tools (called the Quantile Extraction method) to build these models. This method lies on the uncertainty level control of each uncertain parameter with a weighted variations of parameter quantiles. 4. DETERMINISTIC MODELS Finally, following the dynamic uncertainties assessment, the Quantile Extraction process of Light-Up allows the construction of deterministic static geomodels which have Low, Best and High dynamic responses for a given dynamic setup (Low, Best and High dynamic setups). |
