岩性油气藏 ›› 2025, Vol. 37 ›› Issue (4): 159168.doi: 10.12108/yxyqc.20250415
• 地质勘探 • 上一篇
刘秀美1,2, 辛仁臣1,2, 刘豪1,2
LIU Xiumei1,2, XIN Renchen1,2, LIU Hao1,2
摘要: 古地貌是盆地沉积充填过程与动力学背景研究的基础。在岩心、测井、录井以及三维地震资料综合分析基础上,运用构造沉积学、地震沉积学的理论和方法,对辽中凹陷南部渐新统东营组进行了古地貌重建和沉积相分析,并阐明了古地貌对沉积的控制作用。研究结果表明:①辽中凹陷南部东营组发育隆起带、斜坡带、浅洼带和深洼带4种构造地貌单元,地貌之间发育断裂坡折带,整体呈现“东西分带,南北分块”的特征。②研究区东营组主要发育辫状河三角洲、曲流河三角洲、网状河三角洲、湖底扇以及湖泊相等多种类型,沉积相类型及其展布明显受古地貌的控制:东三段湖侵域(ESTd3)—东二段湖侵域(ESTd2)沉积时期,裂陷作用强烈,湖侵域沉积时期辽西低凸起和南部隆升凸起为主要物源区,洼陷区接受近源沉积,控制了辫状河三角洲的发育;东三段高位域(HSTd3)沉积时期,随着湖平面上升,隆起区转变为水下低隆起,发育滨浅湖滩坝沉积;东二段高位域(HSTd2)—东一段(SQd1)沉积时期,断裂活动减弱,先存古隆起转变为水下低隆,近北东—南西向2个条形洼陷带为远源曲流河三角洲的发育提供了重要的地貌背景。
中图分类号:
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