Sedimentation and Its Form ingMechanism of the Forced Lacustrine Regression in the Rift Lacustrine Basin

CAO Ying-chang

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.

Faulty of Geo-Resource and Information, University of Petroleum, Dongying, Shandong 257061

Received Date: 2004-04-05

Rev Recd Date: 2004-06-07

Publish Date: 2005-03-10

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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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Sedimentation and Its Form ingMechanism of the Forced Lacustrine Regression in the Rift Lacustrine Basin

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