潜江凹陷隐蔽油藏成藏主控因素及勘探方向

doi:10.11743/ogg20060611

摘要/Abstract

摘要：

潜江盐湖潜江组-荆河镇组沉积时期,经历了断陷期、断坳期和隆升剥蚀定型期3个构造演化阶段,各阶段古构造面貌各不相同。受古构造面貌、物源、古气候、水体条件等因素控制,潜江凹陷潜江组沉积时期主要发育(扇)三角洲-盐湖两大沉积体系和断坡带、弯折带、盐湖密度流、南部缓坡膏盐4种盐湖沉积充填模式。潜江凹陷潜江组古构造面貌控制了沉积充填,今构造背景控制了油气成藏,水介质条件影响了砂体延伸及展布,砂体成因类型控制了油藏类型和规模。凹陷中部是构造-岩性油藏,东部斜坡带是区域上倾尖灭型岩性油藏,向斜周缘是局部上倾尖灭型岩性油藏勘探的有利区带。

关键词: 结构构造, 古构造面貌, 沉积充填, 盐湖密度流, 隐蔽油藏, 潜江组, 潜江凹陷

Abstract:

During the deposition of Qianjiang-Jinghezhen formations,Qianjiang salt lake tectonically experienced three evolution phases,i.e.,downfaulting,downwarping, and uplifting-erosion-finalization,each with different paleostructural features.Controlled by the paleostructural features,sources,paleoclimates,and water bodies,(fan)deltaic and salt lake depositional systems,as well as four patterns of salt-lake sedimentary fill(fault slope zones,slope break zones,salt lake density flows and southern ramp gypsic salt),were developed in Qianjiang depression during the deposition of the Qianjiang Formation.In Qiangjiang depression,the paleostructural features of the Qianjiang depression Formation control the patterns of depositional fill;the present tectonic setting controls the hydrocarbon reservoiring;the water media condition have an influence on the extension and distribution of the sandbodies,and the genetic types of sandbodies control the types and sizes of the oil reservoirs.The central part of the depression is favorable for exploration of structural-lithologic reservoirs;the eastern slope zone is favorable for prospecting regional updip pinchout lithologic reservoirs;and the peripheral area of the synclines is favorable for explorations of local updip pinchout lithologic reservoirs.

Key words: structural tectonics, palaeostructural feature, sedimentary fill, salt lake density flow, subtle reservoir, Qianjing Fosmation, Qianjiang depression

中图分类号:

TE112.3

方志雄. 潜江凹陷隐蔽油藏成藏主控因素及勘探方向[J]. 石油与天然气地质, 2006, 27(6): 804-812. doi: 10.11743/ogg20060611 Fang Zhixiong. Main controlling factors and exploration direction of subtle oil reservoirs in Qianjiang depression[J]. Oil & Gas Geology, 2006, 27(6): 804-812. doi: 10.11743/ogg20060611

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