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Lacustrine Basin Slope Break — A New Domain of Strata and Lithological Trap Exploration

Petroleum Science 2004年第2期1卷 55-61页

作者： WangYingmin LiuHao xinrenchen JinWudi WangYuan LiWeiguo Basin＆ReservoirResearchCenter UniversityofPetroleumBeijing102249China KeyLaboratoryforHydrocarbonAccumulationofEducationMinistry UniversityofPetroleumBeijing102249China ChinaUniversityofGeoscinces Beijing100083China

Based on the studies of the Songliao Basin characterized by Cretaceous down-warping, of the Jurassic compressional flexural Junggar basin and of the Bohai Bay Basin characterized by Paleogene rifting, the multiple-grades slope break has developed in lacustrine basins of different origins. Their genetic types can be divided into tectonic slope break, depositional slope break and erodent slope break. The dominant agent of the slope break is tectogenesis, and the scale of slope breaks relates with the size of tectogenesis. The results of the study show that control of mutual grades slope breaks on atectonic traps mainly represent: 1) Atectonic traps develop close to mutual grades slope breaks, with beads-shaped distribution along the slope breaks. 2) In the longitudinal direction, the development of atectonic traps is characterized by the inheritance. 3) Different slope breaks and their different geographical positions can lead to different development types of atectonic traps. 4) A slope break can form different kinds of atectonic traps because of its great lateral variation. 5) The existence of mutual-grade slope breaks leads to different responses of erosion and deposition at different geographical positions in the basin. The oil source bed, reservoir and cap rock combination of atectonic traps is fine. 6) The oil-bearing condition of atectonic traps controlled by slope breaks is very favorable.

关键词： Slope break lacustrine basin sequence stratigraphy atectonic trap

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