【摘要】 层间断层是一种非构造成因断层,本次研究利用常规地震剖面解释、地震属性提取、相干体、方差体和蚂蚁体技术在渤海湾盆地石南地区东二段识别出密集的层间断层。这些层间断层发育在东二上段厚层砂岩和东二下段厚层泥岩界面附近,断距一般小于100m,断层倾角较大,具有一定的优势走向。根据沿层相干体切片,可以将层间断层划分为三个区带:1研究区西部(区域1),断层的密度最大,每公里5~6条,玫瑰花图显示断层的主走向为135°,其次为50°;2研究区中部(区域2),断层的密度最小,每公里2~3条,断层的主走向为30°,其他走向的断层均有发育,整体表现为发散状;3研究区东部(区域3),断层的密度居中,每公里3~4条,断层的主走向约为140°,其次为25°。在识别小断层或裂缝方面,蚂蚁体技术体现出明显的优势,为研究区层间断层的识别提供了依据。层间断层发育在东二下段成熟烃源岩和上覆砂岩的接触部位,可以作为研究区东营组烃源岩重要的排烃通道,其在油气运移和油气成藏中的意义有待进一步研究。更多还原

【Abstract】 A series of interbed faults have been identified by an integration of multiple geophysical approaches such as coherence cube,variance cube,ant tracking and so on.These faults were developed along a lithological interface which separates thick sandstone from the underlying mudstone in the second member of the Dongying Formation(E3d2),Bohai Bay Basin,China.They are characterized by small fault throw(commonly no more than 100 m),small lateral extension,and high fault density.Depending on the characteristics of interbed faults,we divide them into three groups:Group 1located in the western of study area with the highest fault density(5~6n/km),and interbed fault main strike directions on rose diagram are135°and 50°;Group 2located in the centre of study area with the lowest fault density(2~3n/km),and interbed fault main strike direction is 30°,and the other strike directions displays radiational;Group 3located in the eastern of study area,the medium fault density(3~4n/km),and interbed fault main strike directions on rose diagram are140°and 25°.The integration of the multiple geophysical approaches provides an effective way to identify small interbed faults.As important conduits for fluid expulsion,these faults need further research in hydrocarbon migration and accumulation in the area.更多还原