伸展褶皱及其对油气聚集的控制作用———以海拉尔盆地贝中次凹为例
网络出版日期: 2012-04-20
Extensional folds and their control effect on oil and gas accumulation:A case study from Beizhong sub-depression in Hailar Basin
Online published: 2012-04-20
赵建成 , 刘树根 , 孙玮 , 代寒松 , 张志敬 , 邓宾 . 伸展褶皱及其对油气聚集的控制作用———以海拉尔盆地贝中次凹为例[J]. 岩性油气藏, 2012 , 24(2) : 16 -20 . DOI: 10.3969/j.issn.1673-8926.2012.02.004
Beizhong sub-depression is one of the richest oil and gas tectonic units in the Hailar Basin, and it experienced three stages, including rift period, rift-depression period and depression period, which shaped a current complex structure. The west fault-step belt, the east fault-step belt and the lowuplift belt of subsag comprised a typical longitudinal isostatic extensional fold. The actions of extensional stress and gravity created secondary structural styles in the extensional fold, such as tilted faulted-block and slide faulted-ramp. Extensional folds provide important structure of oilgas for extensional basins. The favorable traps and sedimentary facies related to extensional folds can accelerate the accumulation of oil and gas. Extensional folds play an important role in controlling oil and gas accumulation in Beizhong
sub-depression. Its role mainly embodies two respects: the center lowuplift belt is a multiple oil and gas accumulation zone; while the slide faulted-ramp near boundary faults is favorable for oil and gas accumulation.
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