银额盆地苏红图坳陷MSD1井二叠系地层厘定及油气地质意义  

Permian Formation Characteristics and Petroleum Geological Significance of Well MSD1 in Suhongtu Depression,Yin’e Basin

作　　者：韩小锋[1,2] 崔海峰 宋博 许伟[1,2] 史冀忠[1,2] 赵飞[1,2] 许海红 王天云[3] 王宝文 季兴开 HAN Xiaofeng;CUI Haifeng;SONG Bo;XU Wei;SHI Jizhong;ZHAO Fei;XU Haihong;WANG Tianyun;WANG Baowen;JI Xingkai(Xi’an Center of China Geological Survey,Xi’an 710119,Shaanxi,China;Key Laboratory of Paleozoic Oil and Gas Geology in North China,China Geological Survey,Xi’an 710119,Shaanxi,China;BGP Inc.,China National Petroleum Corporation,Zhuozhou 072751,Hebei,China;Nanjing Institute of Geology and Paleontology,Chinese Academy of Sciences,Nanjing 210008,Jiangsu,China)

机构地区：[1]中国地质调查局西安地质调查中心,陕西西安710119 [2]中国地质调查局北方古生界油气地质重点实验室,陕西西安710119 [3]东方地球物理公司,河北涿州072751 [4]中国科学院南京地质古生物研究所,江苏南京210008

出　　处：《西北地质》2024年第6期171-185,共15页Northwestern Geology

基　　金：中国地质调查局项目“银额盆地西部–北山盆地群油气地质调查”(DD20190092);“河西走廊盆地群油气地质调查评价”(DD20242183);“西部重点盆地油气地质调查与评价”(DD20242212);国家自然科学基金项目“阿拉善北部晚古生代构造格局与洋盆闭合过程的古地磁重建”(42172260)联合资助。

摘　　要：长久以来,由于银额盆地覆盖区二叠系地层特征认识不清,致使盆地内钻井揭示的油气产层地质时代存在争议。本次研究利用银额盆地苏红图坳陷MSD1井下部井段岩心样品开展了孢粉学、矿物学、锆石年代学等研究工作,结合盆地内钻井、地震测线及地表露头资料开展地层对比,取得了以下认识:(1)苏红图坳陷MSD1井2669.00~2726.00 m井段内发现的Florinites,Vesicaspora,Striatoabieites,Vittatina和Hamiapollenites等孢粉分子,且碎屑岩薄片显微镜下见腕足、海百合、苔藓虫等零散生物碎屑分布,均指示该段地层为上二叠统哈尔苏海组,时代为二叠纪晚期。(2)结合钻井时井深标定及地震层位追踪,明确银额盆地二叠系在盆地覆盖区广泛分布,二叠系地震反射呈现弱反射–空白反射、中–弱振幅、层内连续性差、底界偶见强振幅连续界线的特征,反映二叠系沉积后经历了多期构造改造作用。(3)盆地内多口钻井发现白垩系、二叠系的两套含油气系统,钻井烃源岩地球化学特征显示银额盆地二叠系具有丰富的油气勘探潜力。综合研究认为,银额盆地二叠系原型盆地分布范围广、油气资源潜力丰富,后期构造改造分区性强,局部地区构造破坏严重,MSD1井二叠系古生物地层学、锆石年代学、岩石矿物学及地球物理学地层特征的发现,实现了盆地露头区与覆盖区二叠系特征对比统一,明确了银额盆地二叠系的油气勘探前景。For a long time,due to the unclear understanding of the characteristics of Permian residual strata in the coverage area of yin'e basin,the geological age of oil and gas production layers revealed by drilling in the basin is controversial.In this study,palynology,mineralogy,zircon chronology and other research work were carried out by using the core samples of the lower well section of well msd1 in Suhongtu depression of yine basin,and stratigraphic correlation was carried out in combination with the drilling,seismic survey line and surface outcrop data in the basin.The following understandings were obtained:①sporopollen molecules such as florinites,vesicaspora,stratoabieites,vittatina and hamiapollenites found in the 2669.00~2726.00 m well section of well msd1 in Suhongtu depression,The scattered bioclastic distribution of brachiopods,crinoids and bryozoans can be seen under the thin section microscope of clastic rock,indicating that the stratum of this section is the upper Permian halsuhai formation,which is in the Late Permian.②Combined with drilling time depth calibration and seismic horizon tracking,it is clear that the Permian in yine basin is widely distributed in the coverage area of the basin.The seismic reflection of the Permian presents the characteristics of weak reflection blank reflection,medium weak amplitude,poor continuity in the layer and occasional strong amplitude continuous boundary at the bottom,reflecting that the Permian has experienced multi-stage structural transformation after sedimentation.③Two sets of oil and gas systems of Cretaceous and Permian have been found in many wells in the basin.The geochemical characteristics of drilling source rocks show that the Permian in yine basin has rich oil and gas exploration potential.It is comprehensively considered that the Permian prototype basin in yine basin has a wide distribution range,rich oil and gas resource potential,strong zoning of late structural transformation,and serious structural damage in some areas.The discovery of Permian

关 键 词：上二叠统 哈尔苏海组 孢粉古生物 锆石定年 银额盆地 

分 类 号：P618.13[天文地球—矿床学]