高邮凹陷北斜坡阜宁组异常压力成因机制研究

Study on forming mechanism of abnormal high-pressure in Funing Formation in northern slope of Gaoyou Sag

苏北盆地高邮凹陷北斜坡阜宁组异常高压主要发育在阜宁组二段(阜二段)、阜宁组三段(阜三段)底部和阜宁组一段(阜一段)顶部。综合分析异常高压成因机制得知:生烃作用、黏土矿物脱水是阜二段异常高压的主要成因;流体传导超压是阜三段、阜一段异常高压的成因。在此基础上恢复了研究区阜宁组超压演化过程。

Abnormal high-pressure in the northern slope of Gaoyou Sag is mainly developed in the second member,the bottom of the third member,and the top of the first member of Funing Formation. By analyzing the forming mechanism of the abnormal high-pressure in Funing Formation,it was concluded that hydrocarbon generation and dehydration of clay minerals were the main causes of abnormal high-pressure in the second member of Funing Formation,and the conduction overpressure of fluid was the cause of abnormal high-pressure in the third member and the first member of Funing Formation. On this basis,it was resumed the overpressure evolution process of Funing Formation in the northern slope.