1. Oversea Business Department, Geophysics Research Institute, BGP Inc., CNPC, Zhuozhou, Hebei 072751, China; 2. Institute of Geophysics and Geochemistry Prospecting, Bureau of Geology and Mineral Resources of Shandong, Ji'nan, Shandong 250000, China
Abstract：The Jurassic Diyab formation is one of the major source rocks in UAE and has served as the main objective of unconventional gas exploration in recent years.This paper focuses on an evaluation method of unconventional carbonate formations based on the multidisciplinary application of geological，seismic，logging，and core data.The technical series includes determining the range of favorable target areas by comprehensive basin simulation； improving data quality based on seismic original track set optimization； using fine petrophysical modeling to construct a geoseismic bridge； using prestack inversion to quantitatively represent characteristics （organic carbon content，brittleness，and porosity） of geological sweet spots，and evaluating engineering sweet spot through fracture prediction study.These methods are suitable for early evaluation and target selection of unconventional carbonate formations.This technology was applied successfully to a comprehensive study of the Diyab formation sweet spot in the western UAE，which guides the well optimization，obtains commercial discovery，and confirms the unconventional gas potential of source rocks.The drilling results indicate high organic carbon content （1.5%~5.0%），relatively low porosity （3%~4%），high brittleness （more than 70%），high anisotropy of sweet spots，and huge unconventional gas potential in the Diyab formation.The results confirm the effectiveness of this technology system，which can provide technical guidance for unconventional gas exploration in similar basins in the Middle East.
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