东营凹陷地层异常压力的成因机制与动态模拟  

Formation Mechanism and Dynamic Simulation of Abnormal Formation Pressure of Dongying Depression

作　　者：李星[1] 黄文娟[2] 孙旭东 田宜平[2] 梁党卫 

机构地区：[1]中国地质大学数学与物理学院,武汉430074 [2]中国地质大学计算机学院,武汉430074 [3]胜利油田分公司物探研究院,山东东营257051

出　　处：《地质科技情报》2012年第6期28-33,共6页Geological Science and Technology Information

基　　金：国家科技重大专项"渤海湾盆地东营凹陷勘探成熟区精细评价示范工程"(2008ZX05051)的二级课题"油气成藏过程定量评价系统(2008ZX0505104)

摘　　要：根据盆地不同演化阶段的地层超压形成有不同主导因素的认识,提出了分层系、分阶段的主导因素超压预测法,分别采用岩土力学原理和干酪根裂解成烃原理建立方程式,然后分层系、分阶段地计算欠压实作用引起的超压和生烃作用引起的超压。利用该方法、模型和软件系统,对东营凹陷各层系的超压形成、分布和演化进行了模拟,发现与实际情况符合较好,即欠压实作用和生烃作用是造成东营凹陷地层异常压力的主导因素,欠压实引起的超压出现在生烃作用引起的超压之前,生烃增压主要出现在2 500m以下深度。模拟结果表明,该方法、模型和软件系统具有较好的合理性和可靠性,适用于对陆相盆地油气成藏过程的超压预测。According to the research of different evolutionary period, we have different understanding of the dominant factors of the formation of overpressure. We propose the forecast method of overpressure of putting forward the dominant factors by layer system and region. We adopt the geotechnics principle and the principle of kerogen cracking into hydrocarbon to establish equations. We calculate the overpressure caused by undercompaction and hydrocarbon generation by layer system and region. Using this method and software system, we simulated the formation, distribution and evolution overpressure of Dongying Depres- sion. We found that the result is in good accordance with actual conditions, which undercompaction and hydrocarbon generation are the dominant factors of abnormal pressure in Dongying Depression. The over-pressure cause by undercompaction appeared before the overpressure caused by hydrocarbon-generating. Hydrocarbon generation turbocharged mainly appear in 2 500 m below the earth. The simulation results show that this method model and software have better rationality and reliability and are suitable for conti-nental petroleum accumulation process overpressure prediction.

关 键 词：异常高压 欠压实作用 生烃增压 孔隙度 渗透率 生烃量 

分 类 号：P618.130.21[天文地球—矿床学]