对沉积盆地被剥蚀地层超补偿沉积的新认识——以东濮凹陷为例

The New Cognition for Compensation Sediment of Eroding Strata in Sedimentary Basin:A case from the Dongpu Depression

在沉积地层剥蚀厚度恢复方法中,被剥蚀地层后期所经历的"超补偿"或"欠补偿"问题,一直是制约这些方法选取和恢复结果正确与否的根本因素。以东濮凹陷为例,分析了利用泥岩压实法恢复东营组剥蚀厚度的合理性,并由此引发了对被剥蚀地层补偿沉积的新认识。研究认为,在利用泥岩压实法等与孔隙度变化趋势有关的剥蚀厚度恢复方法时,被剥蚀地层的补偿沉积应该理解为"重量"的补偿;在利用与温度指标相关的恢复方法时,被剥蚀地层的补偿沉积应该理解为"温度"的补偿,而非简单地理解为"厚度"的补偿。

In the ways of recovering eroding strata＇s thickness,the problem of extra-compensation and less-compensation of eroding strata is the essential factor that always restricts the selection of the ways and the result that is whether right or not.Example for Dongpu Depression,the rationality of recovering the Dongying Formation thickness by the method of mudstone compaction is analyzed.By this,the new cognition for compensation sediment of eroding strata is acquired.The study shows that when using the methods of recovering eroding strata＇s thickness that relates to the tendency of the pore＇s variation with depth,the compensation sediment of eroding strata should be understood by weight compensation.When using the methods of recovering eroding strata＇s thickness that relates to the temperature index,the compensation sediment of eroding strata should be understood by temperature compensation.And it shouldn＇t be understood by thickness compensation simply.