海南福山凹陷火成岩分布特征及对油气勘探的影响
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摘要
根据钻井和地震资料,分析了海南福山凹陷火成岩的分布特征,认为该地区火成岩有3种类型,即:分布于地表的喷发岩、次火山相火成岩、深层侵入岩。上第三系火成岩分布在灯楼角组,下第三系火成岩分布有多个层系,第四系火成岩在福山凹陷呈环带状分布。边界大断层(如美玉断层)是火成岩侵入喷发的主要通道。火成岩活动主要集中在晚第三纪和第四纪。火成岩的存在破坏了断层两侧的波组关系及下伏地层的反射特征,影响了地震资料的解释精度。
The seismic data and drilling data are used to analyze the distribution of igneous rock in Fushan sag. There are three types of igneous rocks in this sag: eruptive rocks in the surface, subvolcanic igneous rocks, and deep intrusive rocks. The Neogene igneous rocks are distributed in Dengloujiao Formation while the Eogene igneous rocks are distributed in many series of strata. The Quaternary igneous rocks are mainly distributed as a circular belt in Fushan sag. The boundary fault (e.g. Meiyu fault) is the important pathway for igneous rocks to intrude and erupt. The activity of igneous rocks mainly concentrates in Neogene and Quaternary. The igneous rock destructs the wave groups on both sides of the fault and the seismic response characteristics underlying strata, having a negative effect on the interpretation of seismic data.
The seismic data and drilling data are used to analyze the distribution of igneous rock in Fushan sag. There are three types of igneous rocks in this sag: eruptive rocks in the surface, subvolcanic igneous rocks, and deep intrusive rocks. The Neogene igneous rocks are distributed in Dengloujiao Formation while the Eogene igneous rocks are distributed in many series of strata. The Quaternary igneous rocks are mainly distributed as a circular belt in Fushan sag. The boundary fault (e.g. Meiyu fault) is the important pathway for igneous rocks to intrude and erupt. The activity of igneous rocks mainly concentrates in Neogene and Quaternary. The igneous rock destructs the wave groups on both sides of the fault and the seismic response characteristics underlying strata, having a negative effect on the interpretation of seismic data.
引文
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[4] 史兰斌,林传勇,陈孝德,等.琼北第四纪玄武岩中微型地幔岩捕掳体的发现及其意义[J].地震地质,2003,25(增刊):33～37
[5] 付建明.琼北新生代火山作用与构造环境[J].桂林工学院学报,1997,17(1):26～29
丁卫星等,福山凹陷有利区带圈闭评价研究,2001。
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