| 东海陆架盆地西湖凹陷超压成因机制 |
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| 引用本文： | 段谟东,叶加仁,吴景富,单超,雷闯.东海陆架盆地西湖凹陷超压成因机制[J].地球科学,2017,42(1):119-129. |
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| 作者姓名： | 段谟东 叶加仁 吴景富 单超 雷闯 |
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| 作者单位： | 1.中国地质大学工程学院，湖北 武汉 430074 |
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| 基金项目： | 国家“十二五”重大油气专项No.2011ZX05023-004-010 |
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| 摘 要： | 西湖凹陷超压普遍发育，成因机制复杂，目前研究未见深入.从产生超压的主要因素入手，采用定性分析与定量计算相结合的方法，基于超压层段的测井响应特征、速度与垂直有效应力、沉积速率与孔隙度演化史、压力演化史与生烃强度史耦合的初步判断，再通过定量的计算综合分析了西湖凹陷超压的成因机制.研究表明:不均衡压实作用和生烃作用是西湖凹陷超压形成的主要机制，但在不同的区带有一定的差异.其中保俶斜坡带以不均衡压实作用为主，经过估算生烃作用贡献率为23%～57%，平均达到41%；而在中央背斜带超压形成机制有两种模式，大部分是以生烃作用为主的增压模式，贡献率为51%～78%；个别井位研究显示以不均衡压实作用为主的增压模式.在三潭深凹超压的形成中，不均衡压实作用与生烃作用相当，生烃作用增压稍强于不均衡压实作用增压，生烃作用的平均贡献率为60%左右.
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| 关 键 词： | 成因机制 超压 西湖凹陷 石油地质 |
| 收稿时间： | 2016-06-06 |
Overpressure Formation Mechanism in Xihu Depression of the East China Sea Shelf Basin |
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| Abstract: | Overpressure is widely developed in Xihu depression, which has complicated formation mechanism. However, there is no in-depth study on this topic at present. In this paper, starting from the main factors that produce overpressure, we use both the micro analysis and macro evidence to comprehensively analyze the mudstone overpressure formation mechanism in the Xihu depression of the East China sea shelf basin, based on the logging response characteristics of overpressure formation, as well as the relationship between speed and vertical effective stress, the relationship between the evolution history of deposition and porosity, the coupling of pressure evolution history and that of hydrocarbon-generated rate. It is concluded that overpressure formation in Baochu slope belt is mainly attributed to under-compaction, and its hydrocarbon generation contribution rate is estimated at 23%-57% with an average of 41%. In the central anticlinal belt, overpressure formation mainly has the following two models: one is the model of hydrocarbon generation with a contribution rate of 51%-78%, and the other is the model of under-compaction interaction. Both the hydrocarbon generation and under-compaction have played an important role in the overpressure formation in Santan sag and the average contribution rate of hydrocarbon generation is about 60%. |
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