Sedimentation and Its Form ingMechanism of the Forced Lacustrine Regression in the Rift Lacustrine Basin
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摘要: 断陷湖盆中相对湖平面下降引起的湖退作用称之为强制湖退作用。强制湖退作用时期若存在沉积物供给盆地,将加速湖退作用,并形成一套具有明显前积结构的强制湖退前积体。强制湖退前积体的顶积层不发育,地震剖面上具斜交前积反射结构。强制湖退前积体的顶界面为层序界面,且伴随有下切谷的形成。气候变化、构造抬升和边界断层的幕式断陷活动引起的盆地缓坡带基底差异沉降运动均可引起断陷湖盆中相对湖平面的下降,也是引起强制湖退作用的三大成因机制。强制湖退前积体具有良好的油气成藏条件,是隐蔽油气藏有利勘探目标。Abstract: The lacustrine regression caused by the falling of the relative lake-level in rift basin is called Forced Lacustrine Regression ( FLR). Given the sediments supply in FLR period, the lacustrine regression action will be strengthened and, correspondingly, a set of foreset sandbodies with evidently oblique progradational configuration will be formed. The foreset sandbody usually absents the top set beds and shows an oblique progradational reflection configuration on the seismic profile. The top boundary of the foreset sandbody is corresponding to sequence boundary, and often develop sincise valleys. Three forming mechanisms that give rise to the FLR can be concluded as climate change,structural up lift and basement differential subsidence in gentle slope caused by ep isodic movements of boundary faults.They can also lead to the falling of the relative lake-level in rift basin. The foreset sandbody formed in FLR period will be the favorable exploration target as a subtle reservoir due to its good forming conditions for reservoirs.
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Key words:
- forced regression /
- sequence stratigraphy /
- forming mechanism /
- rift lacustrine basin
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