Novel pyrolytic methods developed by Saudi Aramco to quantitatively assess reservoir quality from residual hydrocarbon staining on drill cuttings have been applied in "real-time" to assist with geosteering horizontal oilfield development wells. The subject methods include: the Pyrolytic Oil-Productivity Index (POPI), the Apparent Water Saturation (ASW) Method, and the Compositional Modeling Method (CoMod). These methods provide the assessment of oil quality, reservoir productivity, water saturation, and tar identification. Most well site tools logging tools provide an indirect assessment of the rock properties, pore system, and fluid properties in a reservoir. Pyrolytic methods provide a direct assessment of the residual hydrocarbons present on rock samples and can be used to assess connectivity with the active fluid system in the reservoir. Results from pyrolysis have shown a close relationship to results from well logs, core data, and dynamic test data. To assist with Geosteering horizontal development wells, Saudi Aramco utilizes proprietary instrumentation to obtain data in the field and employ pyrolytic methods in "real-time." This data is integrated with other well data to confirm correct well placement early in the drilling process. This provides better success in meeting well design objectives while reducing lost rig time for unnecessary testing, or the drilling of additional side-track wells

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