关键词: 下二叠统, 礁古油藏, 储层, 成藏机理, 古风化壳, 岩溶带, 广西亭亮

Abstract: The reef of Maokou Age,Lower Permian in Tingliang and Ningming,Guangxi Autonomous region is one of the largest remnant reef oil pools.The paper provides a great deal of data to describe the reef reservoir origin;histories of burial structure,organic evolution, porosity evolution and poolforming mechanism.It is indicated that at the beginning the primary porosity in the reef was widely developed.However it was completely destroyed due to calcite multi cementation,filling in and burial compaction in the diagenesis.The finally formed reef reservoir and its effective porosity were dominantly controlled by deep burial organic dissolution,unconformity surface at reef top and paleo weathering crust karst.Meanwhile the oil generating depression close to the south of the reef provided a plenty of oil source which together with subsurface organic acidic fluids may have multi migrated to the reef reservoir and further carried out deep buried organic dissolution to the paleokarst on the reef,which offered the most effective conditions and space at the right moment for the forming of effective porosity zone and oil gas migration and accumulation.The thick Triassic shale steadily overlying the top of reef reservoir provided a good regional cap rock.

Key words: Lower Permian, destroyed reef oil pool, reservoir, pool-forming mechanism, paleo weathering crust, karst Tingliang Guangxi