东营凹陷超压结构及控制因素

doi:10.3969/j.issn.1672-7703.2018.03.004

摘要/Abstract

摘要： 东营凹陷超压现象非常普遍，压力结构复杂，在不同深度、不同层系、不同构造带超压结构具有明显差异性。通过对东营凹陷实测地层压力、泥岩测井声波时差响应特征、地震速度谱超压特征的研究，详细地剖析了东营凹陷超压结构的差异性及其控制因素。东营凹陷超压结构明显具有分带性特点，纵向上超压主要发育在2200~4500m范围内，超压的主体主要发育在沙三段-沙四段；平面上超压主要发育在利津、牛庄、博兴、民丰4个洼陷，其中利津洼陷超压幅度最大，民丰洼陷、牛庄洼陷次之，博兴洼陷最弱。超压结构差异性与构造格局、烃源岩发育演化程度以及断裂活动密切相关，凸洼相间的构造格局控制了压力场空间变化，烃源岩分布及热演化程度控制了超压的分布和幅度，长期、继承性大断层控制了超压体系的边界。

关键词: 地层压力, 超压结构, 控制因素, 东营凹陷

Abstract: Overpressure is quite common and pressure structures are complex in Dongying sag. The overpressure structures are obviously diverse at different depth in different strata and different tectonic belts. The differences of overpressure structures in Dongying sag and their controlling factors were analyzed in detail by investigating the measured formation pressure, the acoustic log response characteristics of mudstone and the overpressure characteristics of seismic velocity spectrum in this sag. It is shown that the overpressure structures in Dongying sag present obvious zoning characteristics. Vertically, the overpressure is mainly developed in the depth of 2200-4500 m, and its main bodies are mainly developed in Es3 and Es4. Areally, the overpressure is mainly developed in Lijin, Niuzhuang, Boxing and Minfeng subsags. The overpressure amplitude is the highest in Lijin subsag, secondarily in Minfeng and Niuzhuang subsags and the lowest in Boxing subsag. The diversity of overpressure structures is closely related to the structural pattern, the evolution degree of source rocks and the activity of faults. The spatial variation of pressure feld is controlled by the structural pattern of salient alternating with subsag, and the distribution and amplitude of overpressure are dependent on the distribution and thermal evolution degree of source rocks, and the boundary of overpressure system is dominated by long-term inherited major faults.

Key words: formation pressure, over-pressure structure, controlling factor, Dongying sag

中图分类号:

邱贻博. 东营凹陷超压结构及控制因素[J]. 中国石油勘探, 2018, 23(3): 28-34.

Qiu Yibo. Overpressure structure in Dongying sag and its controlling factors[J]. China Petroleum Exploration, 2018, 23(3): 28-34.

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