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位于万安滩西陆架区的万安盆地处于印支地块南缘、曾母次地块的西北侧,是新生代发育的大型板内具扭性的断坳复合型盆地。由于可能受向南延伸的红河区域走滑大断裂(RRF)的影响,多有右旋剪切应力场作用。故万安盆地的边界断层和盆内断层均不同程度地反映出扭动构造特征和扭动构造样式。早第三纪以张扭作用为主,后期(晚中新世)局部地区受到轻微压扭作用的改造。与扭动构造伴生的圈闭类型多样,烃源丰富,成熟度高,具有良好的油气聚集保存条件。
The Wanan Basin, located in the west shelf area of Wananan Beach, is located on the southern margin of the Indo-China block and has the northwest side of the mother sub-block. It is a Cenozoic fault-depression complex basin with large scale in the Cenozoic. Due to the influence of the strike-slip fault (RRF) in the Honghe area, which may extend to the south, there are more dextral shear stress fields. Therefore, the boundary faults and the basin faults of the Wan’an Basin all reflect the twisting structural features and the twisting structural styles to varying degrees. Early Tertiary dominated by flaws, late (Late Miocene) in some areas under the influence of a slight pressure to transform. Different types of traps associated with wringing structure, abundant hydrocarbon source, high maturity, and good hydrocarbon accumulation and preservation conditions.