Abstract

Laminated shaly sand sequences are deposited in all types of sedimentary depositional (continental, transitional and marine) environment. These shaly sand reservoirs are alternating thin layers of sand and shale where the thickness of the individual layer is less than the vertical resolution of conventional logging tools. The measured apparent resistivity by the conventional logging tool provides the average resistivity of these laminations which is dominated by conductive layers. These laminated sequences may contain large amount of hydrocarbon. However, interpretation of these kinds of reservoirs is quite difficult.