Restoration of erosion amount and control of sedimentation in Lishui depression based on weighted average algorithm
The Lishui depression is one of the main battlefields for oil and gas exploration in the East China Sea shelf basin.Due to multiple tectonic movements and significant uplift and erosion of the strata,the understanding of the prototype basin of the Lishui Depression is unclear,especially restricting the understanding of the distribution of hydrocarbon source rocks and reservoirs in the depression.Starting with the key parameters of the denudation recovery,this paper determined the denudation thickness of the key unconformity by comprehensive trend epitaxy method,acoustic time difference method,vitrinite reflectance method and sedimentation rate method.The original layer thickness is restored by combining the residual thickness and decompacting correction.Under the control of sedimentary compensation principle,the paleogeomorphic features of"early separation,late connection,center shifting east"from Lingfeng Formation to Wenzhou Formation in Lishui Sag are restored.Based on the analysis of paleo-geomorphology and sedimentary facies,the differential distribution model of sedimentary bodies under the control of uplift,slope and depression is established.The study of palaeo-geomorphic system provides strong theoretical support for the further evaluation of hydrocarbon source rocks and favorable reservoir distribution in Lishui depression.
Lishui depressionrestoration of erosion volumepalaeogeomorphology
万方数据
维普
