【作者】 于丹；

【导师】 付广； 付晓飞；

【作者基本信息】 大庆石油学院 ， 矿产普查与勘探， 2007， 硕士

【摘要】 综合利用地震、测井、生产测试等相关地质资料,在研究柴达木盆地北缘构造发育特征的基础上,总结了断裂的类型、活动期次以及断裂分布,分析了断裂的发育特征,结果表明柴北缘下干柴沟组上段和上干柴沟组为主要的滑脱层,沿浅层滑脱面滑脱的断裂决大部分向上断穿到地表,从断穿层位看,柴北缘断裂类型比较简单,主要有3种:一种是基底卷入型断至地表的断裂;第二种为基底卷入型断至下干柴沟组上段和上干柴沟组的断裂;第三种为以下干柴沟组上段和上干柴沟组为滑脱面断至地表的盖层滑脱型断裂。综合分析断层侧向和垂向封闭机理及其影响因素,确定断层侧向封闭性评价方法为以Allen图为基础,以断裂带中泥质含量计算结果去预测断层岩类型,断层垂向封闭性评价方法为计算断面正压力及分析裂缝的评价方法。对柴北缘典型地区断裂的断层封闭性进行了解剖,结果表明南八仙地区主要发育泥岩涂抹和少量的层状硅酸盐/框架断层岩,断层侧向好,断层垂向封闭性受次级裂缝影响,封闭性较差。马北地区主要发育泥岩涂抹和层状硅酸岩/框架断层岩,断层侧向封闭性好,油砂山组断裂埋深较小,垂向封闭性较差;在下干柴沟组上段、上干柴沟组以及下干柴沟组下段产生部分裂缝,使垂向封闭性变差。鸭湖地区主要发育泥岩涂抹、层状硅酸岩/框架断层岩,断层侧向封闭性好。除③号断裂埋深较浅,断层垂向封闭性较差外,其它断裂垂向封闭性好。油气藏的分布明显受到断裂的控制,断裂早期的沟通为油气运移聚集提供了条件、形成多种类型油气藏,后期活动的断裂对油气藏的保存和破坏有着制约的作用。更多还原

【Abstract】 Bye use of geological date such as seismic, well logging, produce testing etc, the structural characteristic is studied and the evolving process of the north of Chaidamu basin is reversed, the type, the action time and the distribution of fault are summarized, the development characteristic of fault is analyzed, the result shows that up member of Xiaganchaigou formation and Shangganchaigou formation are mainly detachment zones in the north of Chaidamu basin, fault that slip from the shallow detachment zone majority throw to earth surface. From throw level to see, fault type is very simple in the north of Chaidamu basin, that mainly have three types, first is basement involution fault that throw to the earth surface, second is basement involution fault that throw to de up member of Xiaganchaigou formation and Shangganchaigou formation, third is overlying formation slip fault that throw to the earth surface from two detachment zones, up member of Xiaganchaigou formation and Shangganchaigou formation.The lateral seal and vertical seal mechanism of fault and effecting factor are analyzed, the result shows that the evaluation method of fault lateral seal is Allan that is the base, using shale content calculation result to forecast fault rock type, the evaluation method of fault vertical seal is to calculate fault plane normal pressure and analyze fracture seal. Fault seal of type area in the north of Chaidamu basin is dissected, the result shows that Nabaxain area mainly develops clay smears and phyllosilicate-framework fault rock, the lateral seal is good, the vertical seal is bad because of secondary fracture, Mabei area mainly develops clay smears and phyllosilicate-framework fault rock, the lateral seal is good, fault buried depth is contrast shallow in Youshashan formation, vertical seal is bad, because partly fracture formed in up member of Xiaganchaigou formation, Shangganchaigou formation and lower member of Xiaganchaigou formation, vertical seal is bad, Yahu area mainly develops clay smears and phyllosilicate-framework fault rock, the lateral seal is good, fault vertical seal is good expect that③fault vertical seal is bad because③fault buried depth is shallow. The distribution of oil-gas reservoir is obviously controlled by fault, fault act in early time that provide the condition of oil-gas migration and accumulation, formation multiple types oil-gas reservoirs, Fault act in late time that confined oil-gas reservoirs’preservation and destruction.更多还原