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东洑凹陷是一个以古生界为基底的地堑式断陷盆地,面积五千三百平方公里。凹陷内几套盐膏岩层,它们对油气聚集的制约作用是东洑凹陷石油地质的重要特色之一。新生界之下广泛分布着石炭-二迭煤系地层,它们在新生界覆盖下的二次成气作用是本区另一个令人关注的问题。
Dongliu depression is a Paleozoic-based graben-style fault basin, an area of 5300 square kilometers. Several sets of salt-gypsum rock formations in the sag are one of the most important features of the petroleum geology in the Dongliu sag as they restrict the hydrocarbon accumulation. The Permo-Carboniferous strata are widely distributed beneath the Cenozoic and their secondary gas-forming role under the coverage of the Cenozoic is another area of concern.