Methods A lot of basic data are used to analyze the characteristics of subnormal pressure in Linnan subsag and how it exerts influence on hydrocarbon distribution.

方法通过大量基础数据，分析了临南洼陷的异常压力特征，以及异常低压对本区油气分布的影响。

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The forming mechanisms of subnormal pressure can be divided into 4 types: 1)increase in pore volume caused by tectonic uplift and formation erosion, or chemical effects of pore water;

将异常低压的形成机制归纳为4大类：1）构造抬升和地层剥蚀、孔隙水化学作用引起的孔隙体积增大；

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This thesis will be helpful to the study on subnormal formation pressure and it will be of great importance to the exploration and development of Sulige gas field and the similar gas fields.

本论文有助于丰富低压油气藏成因理论研究，对苏里格气田及同类型气田的勘探开发具有重要的参考价值和指导意义。

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