苏北盆地海安凹陷泰州组一段沉积特征及演化  

Features and Evolution of Sedimentary Facies of First Member of Taizhou Formation in Hai'an Sag of Subei Basin

作　　者：陆英[1] 

机构地区：[1]中国石化江苏油田分公司地质科学研究院,江苏省扬州市225009

出　　处：《中国石油勘探》2007年第5期36-40,共5页China Petroleum Exploration

基　　金：中国石油化工股份有限公司重点科技攻关项目"苏北盆地泰州组成烃条件研究"(P05004)的部分研究成果

摘　　要：苏北盆地海安凹陷上白垩统泰州组(K2t)为凹陷发育初期形成的一套碎屑岩沉积地层,总体自下而上构成由粗到细的沉积旋回。通过对区内30余口探井的录井、测井和岩心资料综合分析,认为泰州组一段沉积早、中期为辫状三角洲沉积,晚期转变为正常三角洲沉积类型,在此基础上又进一步识别出5种亚相和11种微相。该区的三角洲沉积体系为典型的退积型沉积体系,但伴随湖平面的反复升降,又表现出明显的多旋回性。综合分析泰州组各沉积时期沉积相的平面分布及演化特点,指出了梁垛—安丰—海中一带沉积砂体发育,是油气储层发育的有利地区。Taizhou Formation of Upper Cretaceous(K2t)in Hai'an Sag of Subei Basin is a set of clastic rocks developed in the early stage of sag formation,which vertically forms a normal sedimentary cycle from lower to upper.Comprehensive analysis of the mud log,log,and core data of more than 30 wells shows that types of depositional systems in the area mainly belong to braided delta depositional system in the early to middle period of the first member of Taizhou Formation,while normal delta depositional system in the late period of the member.It can be divided into five types of sedimentary subfacies and 11 types of sedimentary microfacies.The normal delta sedimentary system in the area typically belongs to retrogradation depositional system with clear multicyclicities with frequent movement up and down of the lake level.Comprehensive analysis of the distribution and evolution of depositional systems of the Formation shows that Liangduo-Anfeng-Haizhong region where sand bodies developed is favorable for forming petroleum reservoirs.

关 键 词：沉积相 沉积演化 泰州组 海安凹陷 苏北盆地 

分 类 号：TE111[石油与天然气工程—油气勘探]