渤海海域沙东地区馆陶组火山通道相构型及成因机制

发布时间：2018-04-17 00:06

本文选题：火山岩 + 火山通道　；参考：《特种油气藏》2017年01期

【摘要】：为探讨渤海海域沙东地区火山活动规律,以相对易识别的火山通道相为研究对象,利用沙东A区三维地震资料和少量钻井资料,采用构型解剖的方法,分析了火山通道相形态特征、活动期次及展布规律。结果显示:火山通道由上部锥形体和下部管体2部分组成,上部锥形体可识别出底面、顶面和内部充填3个构型要素;根据地层接触关系,顶面可以分为上超型、发散型和整一型3种;底面主要为削截型;内部充填主要包括块状充填和似层状充填2种。利用沉积作用对岩浆活动的响应特征来分析通道相的活动期次,总结出地层接触关系和上覆地层厚度变化2种期次判别的标准,并识别出3期火山活动。馆陶组火山主要为裂隙式喷发,火山通道沿断裂带呈串珠状展布。受NNE向的郯庐断裂和NWW向的张蓬断裂带双走滑共轭剪切影响,工区馆陶组时期断层活动较为强烈,热地幔柱也比较活跃,形成了该区多期岩浆喷发事件。该研究可为沙东地区火山岩油气勘探提供一定借鉴和指导。
[Abstract]:In order to study the regularity of volcanic activity in Shadong area of Bohai Sea, taking the relatively recognizable volcanic passageway facies as the research object, using 3D seismic data and a small amount of drilling data in Shadong A area, the method of configuration anatomy is adopted.The characteristics of phase morphology, activity periods and distribution of volcanic channels are analyzed.The results show that the volcanic passage is composed of two parts: the upper cone body and the lower tube body. The upper cone body can identify the bottom surface, the top surface and the inner filling, and the top surface can be classified into the upper supertype according to the stratigraphic contact relationship.There are three types of divergence type and integral type; the bottom surface is mainly truncated type; the internal filling mainly includes massive filling and laminar filling.Based on the characteristics of sedimentary response to magmatic activity, the active periods of channel facies are analyzed, and the criteria for distinguishing stratigraphic contact relationship and overlying strata thickness change are summarized, and three periods of volcanic activity are identified.Guantao formation volcanoes are mainly fissured eruptions, and the volcanic channels are beaded along the fault zone.Influenced by the Tan-Lu fault in the direction of NNE and the conjugate shear of the double strike-slip in the Zhangpeng fault zone in the NWW direction, the fault activity of Guantao formation is relatively strong and the hot mantle plume is active in the working area during the period, resulting in multiple magmatic eruptions in this area.This study can be used for reference and guidance for oil and gas exploration of volcanic rocks in Shadong area.
【作者单位】：中海石油(中国)有限公司天津分公司;
【基金】：国家科技重大专项“近海隐蔽油气藏勘探技术”(2011ZX05023-002)
【分类号】：P618.13

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