西沙海域南部多边形断层的发现及其分布特征与控制因素

发布时间：2018-02-20 16:30

本文关键词： 西沙海域多边形断层断层分布特征控制因素　出处：《海相油气地质》2017年01期 　论文类型：期刊论文

【摘要】：根据新采集的三维地震资料,在西沙海域南部发现了多边形断层,其发育分布具有层控特征明显、在富泥地层中发育、多方位走向、纵向断距小、平面延伸长度小且形态为不规则多边形等特征。由于研究区东西两侧应力条件的差异,导致多边形断层发育特征的差异明显。通过对多边形断层发育控制因素的分析,认为地层岩性(特别是西沙海域上构造层的远源细粒沉积物)是其发育的主控因素之一,同时水道砂岩、成岩作用及构造作用等也是影响其发育分布的因素。多边形断层可以作为流体运移的通道,它与下部构造断层连接可将深部烃源岩中的油气运移到上部储层中聚集,或继续向上运移到浅部地层中形成天然气水合物。
[Abstract]:According to the newly collected 3D seismic data, polygonal faults were found in the south of Xisha Sea area. The polygonal faults developed in mud rich strata with obvious stratigraphic characteristics. The plane extension length is small and the shape is irregular polygon. Due to the difference of stress conditions between east and west sides of the study area, the difference of fault development characteristics of polygon is obvious. Through the analysis of the controlling factors of polygon fault development, It is considered that stratigraphic lithology, especially the distant fine-grained sediments of the tectonic layer in Xisha Sea area, is one of the main controlling factors for its development, and the waterway sandstone, Diagenesis and tectonism are also the factors affecting its development and distribution. Polygonal fault can be used as a channel for fluid migration, and it can transfer oil and gas from deep source rock to the upper reservoir to accumulate. Or continue to migrate upward to the shallow formation to form natural gas hydrate.
【作者单位】：中国石油杭州地质研究院;
【基金】：国家科技重大专项“西沙海域油气地质综合研究及有利勘探区”(编号:2011ZX05025-004) 国家自然科学基金“海洋一次波与多次波联合最小二乘逆时偏移”(编号:41504105)联合资助
【分类号】：P618.13

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