关键词: 留西地区, 层序地层学, 辫状河三角洲, 岩性油藏, 地质模型

Abstract: The lithologic oil reservoir of Paleogene Es3 recently discovered in Luixi area of Raoyang sag is typical sediment of braided river delta.The data from the lithologic oil reservoirs of this area were analyzed.The sequence stratification of Paleogene in Luixi area was compartmentalized,and the homology stratum era was found from seismic data.The data analysis shows that the Paleogene Es3 is a three-class sequence and three system tracts of subsisting lowstand,lakegressive and high systems tract are developed in Liuxi area.Sedimentary tiny facies of the braided river delta in Luxi area,such as embranchment aquatic sand and estuary dam sand,were identified by observing rock core and analyzing the lithologic compages and logging curves.The plane occurrence and space shape of braided river delta were determined using computer software of Jason seismic inversion.The reservoir rock of the braided river delta in Luixi area was predicted,and the advantaged sections for forming lithologic oil reservoirs were suggested.The conditions for forming lithologic oil reservoirs including sediment environment,sandstone body types of stratigraphy of braided river delta and structure characteristics were investigated.The geologic model for the lithologic oil reservoirs in Luixi area of Raoyang sag was established.The research method for identifying sandstone bodies of lithologic oil reservoirs from seismic data and the effectiveness of exploration in Luixi area of Raoyang sag were described.

Key words: Liuxi ares, sequence stratigraphy, braided river delta, lithologic oil reservoirs, geologic model