天然气地球科学 ›› 2020, Vol. 31 ›› Issue (10): 13751388.doi: 10.11764/j.issn.1672-1926.2020.06.007
曾庆鲁1,2(),张荣虎1,2,张亮3,刘春1,2,陈才3,夏九峰1,2
Qing-lu ZENG1,2(),Rong-hu ZHANG1,2,Liang ZHANG3,Chun LIU1,2,Cai CHEN3,Jiu-feng XIA1,2
摘要:
下白垩统是塔里木盆地西南坳陷主要的勘探层系之一,油气资源丰富但勘探程度较低,新近部署的多口探井均遭遇失利。为指导油气勘探部署,利用露头、钻井、地震和实验分析等资料,对下白垩统残余分布、沉积体系类型及储集层差异演化特征进行了研究。结果表明:①下白垩统沿南天山和昆仑山山前存在喀什北缘、乌泊尔构造带、棋北构造带和柯东构造带4个集中分布区,从山前向盆地内部减薄尖灭,改变了以往呈连续带状分布的认识。②古地貌控制下发育辫状河三角洲和扇三角洲2种沉积体系;其中,辫状河三角洲以前缘亚相为主,厚层水道砂体叠置连片分布,而扇三角洲由平原和前缘亚相构成,具有厚层短轴粗粒特征。③受原始沉积组分和后期成岩改造影响,下白垩统发育次生孔隙型和原生孔隙型2类储层,储集物性表现为中低孔中低渗—特低孔特低渗差异分布,喀什北缘和柯东构造带有利储层相对发育。
中图分类号:
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