东海盆地丽水凹陷异常压力系统特征

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CHARACTERISTICS OF THE ABNORMAL PRESSURE SYSTEM IN THE LISHUI SAG OF THE DONGHAI BASIN

摘要: 丽水凹陷发育第三系快速沉积的地层,其重要特点是异常压力非常明显。文中主要应用地质、钻井、测井、测试等资料,在分析主要探井异常高压的基础上,研究了异常高压的类型、成因机制和分布。研究表明,丽水凹陷异常压力属于顶封滞排型异常压力系统,超压带压力梯度明显不一致,纵向上超压带可划分为封隔层超压带、压力过渡带和超高压带等 3个异常压力带。
- 异常压力 /
- 系统 /
- 封隔层 /
- 成因 /
- 丽水凹陷
Abstract: The Tertiary rapid-deposited strata were developed in the Lishui Sag.Very obvious abnormal pressure is an important feature of them. By using geologic,drilling,logging and testing information in this paper,the types,genetic mechanism and distribution of abnormal pressure are studied based on the analysis of abnormal pressure in main test wellls. The study reveals that the abnormal pressure in the Lishui Sag belongs to the top-sealed expulsion-retarded abnormal pressure system,the pressure gradient of overpressure belts is obviously different,and the overpressure belts can be divided into the sealing layer overpressure belt,the pressure transitional belt and the ultrahigh pressure belt three abnormal pressure belts longitudinally.
- abnormal pressure /
- system /
- sealing layer /
- genesis /
- the Lishui Sag

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