鄂尔多斯盆地二叠系盒8段沉积模式重建及其勘探意义
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摘要
基于鄂尔多斯盆地和华北地台晚古生代地质背景和最新勘探成果资料,指出二叠系下石盒子组盒8段沉积时期该区具有多物源强供给多水系发育、古地形平坦、沉积水体浅、河流相砂体全区分布和无统一连片湖区等沉积特征,据此认为全区主要发育冲积-河流体系。在区域地层划分对比的基础上,利用鄂尔多斯盆地以及华北地区大量钻井岩心、露头资料,对地层岩相特征、沉积相类型及分布特征综合分析,恢复鄂尔多斯及华北地区盒8段沉积时期的古地理格局,表明鄂尔多斯盆地在盒8段沉积时期是位于华北地台西部沉积斜坡的"过水区",全区以冲积平原沉积为主,表现为河道、泛滥平原与河间漫湖交互分布的沉积格局。依据水槽沉积模拟实验结果,建立了"冲积河流-漫湖"沉积模式,揭示该区盒8段大面积含砾砂体成因,为盆地南部致密气勘探部署提供地质依据。
Based on the Late Paleozoic geological background and the latest exploration achievements of the Ordos Basin and North China platform, it is concluded that during the sedimentary period of Permian He 8 Member, the area in concern had multiple material sources, multiple river systems, flat terrain, shallow sedimentary water, widely distributed fluvial facies sand body and no continuous lake area, so alluvial river sedimentary system developed in the whole region. Based on stratigraphic correlation and division, and a large number of drilling and outcrop data, a comprehensive analysis of lithofacies and sedimentary facies types and distribution was carried out to reconstruct the ancient geographic pattern of the He 8 Member sedimentary period. The results of paleogeography restoration show that the area of Ordos Basin was the "runoff area" in the sedimentary slope in the western part of the North China platform during the sedimentary period of He 8 Member, the whole region was mainly alluvial plain sedimentation featuring alternate fluvial facies, flood plain facies and flood-plain lake facies. According to the results of flume deposition simulation experiment, a new sedimentary model of "alluvial river & flood-plain lake" is established, which reveals the genesis of large area gravel sand body in He 8 Member of this area and provides geological basis for the exploration of tight gas in the south of the basin.
Based on the Late Paleozoic geological background and the latest exploration achievements of the Ordos Basin and North China platform, it is concluded that during the sedimentary period of Permian He 8 Member, the area in concern had multiple material sources, multiple river systems, flat terrain, shallow sedimentary water, widely distributed fluvial facies sand body and no continuous lake area, so alluvial river sedimentary system developed in the whole region. Based on stratigraphic correlation and division, and a large number of drilling and outcrop data, a comprehensive analysis of lithofacies and sedimentary facies types and distribution was carried out to reconstruct the ancient geographic pattern of the He 8 Member sedimentary period. The results of paleogeography restoration show that the area of Ordos Basin was the "runoff area" in the sedimentary slope in the western part of the North China platform during the sedimentary period of He 8 Member, the whole region was mainly alluvial plain sedimentation featuring alternate fluvial facies, flood plain facies and flood-plain lake facies. According to the results of flume deposition simulation experiment, a new sedimentary model of "alluvial river & flood-plain lake" is established, which reveals the genesis of large area gravel sand body in He 8 Member of this area and provides geological basis for the exploration of tight gas in the south of the basin.
引文
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[2]田景春,吴琦,王峰,等.鄂尔多斯盆地下石盒子组盒8段储集砂体发育控制因素及沉积模式研究[J].岩石学报,2011,27(8):2403-2412.TIAN Jingchun,WU Qi,WANG Feng,et al.Research on development factors and the deposition model of large area reservoir sandstones of He8 section of Xiashihezi Formation of Permian in Ordos Basin[J].Acta Petrologica Sinica,2011,27(8):2403-2412
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[6]文华国,郑荣才,高红灿,等.苏里格气田苏6井区下石盒子组盒8段沉积相特征[J].沉积学报,2007,25(1):90-98.WEN Huaguo,ZHENG Rongcai,GAO Hongcan,et al.Sedimentary facies of the 8th Member of lower Shihezi Formationin Su6 Area,Sulige Gas Field[J].Acta Sedimentologica Sinica,2007,25(1):90-98.
[7]杨西燕,沈昭国,方少仙,等.鄂尔多斯盆地乌审旗气田中二叠统下石盒子组盒8段下亚段滩坝砂体沉积特征[J].古地理学报,2007,9(2):175-182.YANG Xiyan,SHEN Zhaoguo,FANG Shaoxian,et al.Sedimentary characteristics of beach and bar sand bodies in the lower sub member of Member 8 of Xiashihezi Formation of Middle Permian in Wushenqi Gas field,Ordos Basin[J].Journal of Palaeogeography,2007,9(2):175-182.
[8]肖建新,孙粉锦,何乃祥,等.鄂尔多斯盆地二叠系山西组及下石盒子组8段南北物源沉积汇水区与古地理[J].古地理学报,2008,10(4):341-354.XIAO Jianxin,SUN Fenjin,HE Naixiang,et al.Permian Shanxi Formation and Member 8 of Xiashihezi Formation in Ordos Basin:Palaeogeography and catchment area for sediments derived from north and south provenances[J].Journal of Palaeogeography,2008,10(4):341-354.
[9]王卫红,田景春,张锦泉.鄂尔多斯盆地二叠系盒8段沉积特征再研究[J].成都理工大学学报(自然科学版),2016,43(2):224-232.WANG Weihong,TIAN Jingchun,ZHANG Jinquan.Research on sedimentary environment of the Member8 of Middile Permian Xiashihezi formation in Ordos Basin,China[J].Journal of Chengdu University of Technology(Science&Technology Edition),2016,43(2):224-232.
[10]杨俊杰.鄂尔多斯盆地构造演化与油气分布规律[M].北京:石油工业出版社,2002.YANG Junjie.Tectonic evolution and distribution of oil and gas distribution in Ordos Basin[M].Beijing:Petroleum Industry Press,2002.
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[13]陈全红,李文厚,胡孝林,等.鄂尔多斯盆地晚古生代沉积岩源区构造背景及物源分析[J].地质学报,2012,86(7):1150-1162.CHEN Quanhong,LI Wenhou,HU Xiaolin,et al.Tectonic setting and provenance analysis of late Paleozoic sedimentary rocks in the Ordos Basin[J].Acta Geologica Sinica,2012,86(7):1150-1162.
[14]陈孟晋,汪泽成,郭彦如,等.鄂尔多斯盆地南部晚古生代沉积特征与天然气勘探潜力[J].石油勘探与开发,2006,33(1):1-5.CHEN Mengjin,WANG Zecheng,Guo Yanru,et al.Late Paleozoic sedimentary systems and gas potential in the south Ordos Basin[J].Petroleum Exploration and Development,2006,33(1):1-5.
[15]李亚龙,于兴河,单新,等.鄂尔多斯盆地东南部下石盒子组盒8段物源特征与沉积相[J],东北石油大学学报,2016,40(3):51-60.LI Yalong,YU Xinghe,SHAN Xin,et al.Provenance and sedimentary facies of He8 member of Xiashihezi formation in Southeastern Ordos Basin[J].Journal of Northeast Petroleum University,2016,40(3):51-60.
[16]张宗林,田景春,罗香建,等.鄂尔多斯盆地北部二叠系下石盒子组洪水泥石流与牵引流沉积特征[J].地球科学与环境学报,2014,36(7):21-30.ZHANG Zonglin,TIAN Jingchun,LUO Xiangjian,et al.Sedimentary characteristics of flood debris flow and traction current in the lower Shihezi Formation of Permian in the Northern of Ordos Basin[J].Journal of Earth Sciences and Environment,2014,36(7):21-30.
[17]王鸿祯.中国古地理图集[M].北京:地图出版社,1985.WANG Hongzhen.Paleogeophic atlas of China[M].Beijing:China Cartographic Press.1985.
[18]裴放.河南禹州与山西太原石炭-二叠纪多重地层划分与对比[J].中国区域地质,1999,18(2):132-147.PEI Fang.Multiple stratigraphic division and correlation of the Permo-Carboniferous of Yuzhou of Henan and Taiyuan of Shanxi[J].Regional Geology of China,1999,18(2):132-147.
[19]陈晋镳,伍铁山.华北区域地层[M].武汉:中国地质大学出版社,1997:90-95.CHEN Jinbiao,WU Tieshan.Regional stratigraphic in the North China[M].Wuhan:China University of Geosciences Press,1997:90-95.
[20]全国地层委员会.中国地层指南及中国地层指南说明书[M].北京:地质出版社,2001:55-56.All China Commission of Stratigraphy.Chinese stratigraphic guidelines and instructions for Chinese stratigraphic guidelines[M].Beijing:Geology Press,2001:55-56.
[21]陈世悦,刘焕杰.华北石炭-二叠纪层序地层格架及其特征[J].沉积学报,1999,17(1):63-70.CHEN Shiyue,LIU Huanjie.Sequence stratigraphic framework and its characteristics of the Carboniferous-Permian in north China[J].Acta Sedimentologica Sinica,1999,17(1):63-70.
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