Evolution characteristics of shale diapir in the centre of Song Hong basin
Abstract
Cenozoic deposits in the centre of Song Hong basin (spreading from block 109 to block 115) have a great thickness, which can reach the depth of over 17km. The gas discoveries in this area (such as Bao Vang, Bao Trang, Bao Den, and Cua Lo) are all gas and condensate, and mainly related to the shale diapir formation. The diapirism has taken a very important role in the petroleum system of the centre of Song Hong basin. It is one of the factors to form traps and create migration pathway for gas to move upward to shallow sections along the development process of diapirs.
The cause of diapirism is the releasing of high pressure which existed in the deep area of the basin in late Miocene, early Pliocene and continues to recent time. The high pressure in Song Hong basin may be caused by some reasons including high geothermal gradient, high sedimentation rate in Miocene, Pliocene with mainly fine grain sediment and mudstone and the expulsion of hydrocarbon from Oligocene, Miocene source rocks.
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