南京大学学报(自然科学版) ›› 2020, Vol. 56 ›› Issue (3): 405417.doi: 10.13232/j.cnki.jnju.2020.03.009
杜彦男1,2,吴孔友1(),刘寅1,林红梅3,党思思4,李彦颖1,徐进军1
Yannan Du1,2,Kongyou Wu1(),Yin Liu1,Hongmei Lin3,Sisi Dang4,Yanying Li1,Jinjun Xu1
摘要:
利用地震、测井、岩心以及物性测试数据等资料,从断裂规模和断层生长连接分段性特征入手,分析了埕南断裂构造发育特征及分段性,精细划分了埕南断裂不同段的断裂带结构及差异性,对比了不同断裂带结构单元物性差异性.研究认为:(1)埕南断裂在车西洼陷内具有明显的分段性构造发育特征,可划分为北西向、北西西向、北东向和北东东向四个走向段,其中北西向和北西西向段断裂呈板式,所控洼陷内断裂发育稀疏,北东向和北东东向段断裂呈铲式或坡坪式,所控洼陷内断裂发育密集,构造样式丰富;(2)埕南断裂内部结构发育较为完整,断裂带结构在深浅测向、井径、密度、声波时差和补偿中子测井曲线上具有良好的可识别性;(3)断裂的生长连接过程与断裂带各结构单元厚度变化具有一定的相关性,在落差较大的走向分段上,断裂带各结构单元发育厚度更大,而在各走向段连接点处,断裂带各结构单元厚度较小;(4)各结构单元物性差异明显,诱导裂缝带孔渗性高于围岩,诱导裂缝带孔渗性高于滑动破碎带1~2个数量级.综合研究表明,断裂带结构的发育对流体输导起到重要的控制作用.
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