鄂尔多斯盆地三叠系延长组震积岩特征及其油气地质意义  

Seismites Characteristics and Hydrocarbon Geological Significance of Triassic Yanchang Formation in Ordos Basin

作　　者：孙萌思 张磊夫 刘池洋[3] 封从军[3] SUN Meng-si;ZHANG Lei-fu;LIU Chi-yang;FENG Cong-jun(School of Petroleum Engineering ang Environmental Engineering,Yan′an University,Yan′an 716000;CNPC Research Institute of Petroleum Exploration and Development,Beijing 100000;Department of Geology,Northwest University,Xi′an 710069,China)

机构地区：[1]延安大学石油工程与环境工程学院,陕西延安716000 [2]中国石油勘探开发研究院,北京100000 [3]西北大学地质学系,陕西西安710069

出　　处：《延安大学学报（自然科学版）》2021年第2期61-66,共6页Journal of Yan'an University：Natural Science Edition

基　　金：陕西省自然科学基础研究计划项目(2020JQ-798,2017JM4013);中石油股份公司重大科技专项(2020E-31);延安大学博士科研启动项目(YDBK2018-31)。

摘　　要：通过对鄂尔多斯盆地延长组大量的野外露头剖面考察,结合岩心数据及地震剖面,在鄂尔多斯盆地识别出典型的震积岩并对其特征展开研究。结果表明,延长期构造活动比较活跃,发育大量的震积岩,典型的震积岩构造有液化砂岩脉、液化卷曲变形构造、布丁构造、球-枕构造等,建立了盆地延长组震积岩垂向沉积序列;通过对震积岩发育的空间和平面分布结合延长期同沉积断层统计,认为长8-长4+5是地震活动频繁期,以华池-庆阳-富县为分界线,东北部为地震活动不活跃区,西南部为地震活动活跃区,这与延长期构造活动有很好的一致性,也佐证了鄂尔多斯盆地延长期的构造活跃性,活跃的构造活动发育断层和裂缝可作为有利油气运气通道,对油气勘探提供指导意义。Through the investigation of a large number of field outcrop profiles of Yanchang formation in Ordos Ba⁃sin,combined with core data and seismic profiles,typical seismite is identified and its characteristics are studied in Ordos Basin.The results show that during the extension period,the tectonic activity is relatively active,and a large number of seismite are developed.The typical seismite structures include liquefied sandstone vein,liquefaction crimp deformation structure,pudding structure,ball-pillow structure and so on.The vertical sedimentary sequence of seis⁃mite of Yanchang formation in the Basin is established.Based on the statistics of the spatial and plane distribution of seismite development combined with the statistics of synsedimentary faults in the extension period,it is considered that Chang 8-Chang 4+5 is a period of frequent seismicity,with Huachi-Qingyang-Fuxian as the dividing line,the northeast is an inactive area of seismicity,and the southwest is an active area of seismicity,which is in good agree⁃ment with the tectonic activity of the extension period,which also proves the tectonic activity of the extended period of Ordos Basin.Faults and fractures developed by active tectonic activity can be used as favorable oil and gas luck channels and provide guidance for oil and gas exploration.

关 键 词：鄂尔多斯盆地 延长组 震积岩 构造活跃性 垂向序列 

分 类 号：TE122􀆰[石油与天然气工程—油气勘探]