柴北缘马海东地区路乐河组地层特征及油气勘探意义  

Stratigraphic characteristics of Lulehe formation and its significance for oil and gas exploration in Mahaidong area,northern margin of Qaidam Basin

作　　者：张俊锋[1] ZHANG Junfeng(Exploration&Development Research Institute of Shengli Oilfield Company,SINOPEC,Dongying,Shandong 257015,China)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《石油地质与工程》2023年第2期35-42,共8页Petroleum Geology and Engineering

基　　金：中国石化科技攻关项目(P18054-1)资助。

摘　　要：柴达木盆地北缘马海东地区构造复杂,地层认识不清。为了明确马海东地区古近系底部地层归属,分析构造活动对古近系层序界面的控制,探讨该套地层的地质年代,利用地震、钻井、野外剖面资料,明确了层序界面特征,建立了马海东及周缘E 1-2 l-E 3g下的等时层序地层格架。结果表明,马海东地区古近系底部地层为路乐河组上部1-3砂组,具有底超顶削的地质结构,弥补了以往对马海东地区缺失路乐河组的认识,且在构造低部位发现构造-地层类圈闭。马海东地区路乐河组的发现,补足了该区储盖条件和圈闭条件的短板,成为该区主要勘探目的层系。The structure is so complex that the strata distribution is unclear in Mahaidong area,the northern margin of Qaidam Basin.In order to make clear the attribution of the Paleogene bottom strata in Mahaidong area,the control of tectonic activity on the Paleogene sequence boundary and the geological era of this set of strata were analyzed and discussed.By using seismic,drilling and field profiles,the characteristics of sequence boundary were clarified,and the isochronous sequence stratigraphic framework under E 1-2 l-E 3g 1 in Mahaidong area and its surrounding areas was established.The results show that the bottom stratum of the Paleogene in the Mahaidong area is the upper 1-3 sand sets of the Lulehe formation,which has a geological structure of bottom-up and top cutting.This has changed the previous understanding of the absence of the Lulehe formation in the Mahaidong area,and structural stratigraphic traps have been found in the lower part of the structure.In the end,the discovery of Lulehe formation in Mahaidong area complements the shortcomings of reservoir cap conditions and trap conditions in this area and becomes the main exploration target strata in this area.

关 键 词：马海东地区 路乐河组 地质年代 层序地层对比 地层圈闭 

分 类 号：TE111.1[石油与天然气工程—油气勘探]