Reservoir SH_B of O oilfield in Syria is atypical porous carbonate heavy oil reservoir with low-permeability.It strikingly features in low permeability and high viscosity.Under the present well patterns and development models

the development effect here is poor and it is manifested by three-low parameters:low ratio of produced reserves to proved reserves

low single well production and low recovery.No cost-effective and enforceable development plan has been proposed.Presently

there is no successful case on low-permeability heavy oil reservoir development and no mature technology and experience for reference.The development of this kind of reservoir is still a world-class challenge.In order to improve development benefits and realize effective development

reservoir engineering theories and methodologies

numerical simulation and economic evaluation techniques are used to study and optimize systematically the development models

well types

well patterns

well spacing

lateral length

and thermal recovery parameters of horizontal well.Research me-thods for developing carbonate heavy oil reservoir are suggested

and development strategy specifically for reservoir SH_B is proposed.The optimized development technical policy lays a foundation for development planning and provides a refe-rence for domestic and foreign analogous reservoirs.