摘要
红山嘴油田红89井区位于准噶尔盆地西北缘,该区发育大量的逆断层,影响着该区的油气勘探。为了更好地分析这些断层对砂体的控制作用,以二叠系上乌尔禾组乌二段为例,利用区内丰富的钻井和地震资料分析,在地层厚度变化、砂体分布和断层分析的基础上,分析同生逆断层对沉积物沉积过程源-渠-汇的控制作用,进而分析其对砂体的控制作用。红89井区乌二段受沉积基底古地形的影响,地层分布范围有限,仅在中部呈东-西向条带状展布,自西向东逐渐增厚,为一深切河谷沟槽的地貌特征。红89井区断层发育,东西向逆断层控制着沟槽的分布边界和走向,南北向控制着沟槽的走向。红89井区南北向发育的3条逆断层,将红89井区分割成3级天然水库,逆断层上盘形成的小背斜具备次级物源功能,下盘形成的洼陷是沉积物的主要卸载汇聚区,前展式的逆断层相叠置,增加了地形坡折带的坡度,沉积物过而不沉,是沉积过程中的渠。因此,建立了3种沉积模式:砂体随水流改变方向聚集模式、背斜聚砂模式、陡坡富砂模式。红89井区上乌尔禾组乌二段砂体受沟槽和同生逆断层的控制,砂体主要沿沟槽纵向展布,南北向逆断层控制沉积过程的源-渠-汇,进而控制着该区砂体的分布。
H89 block in the Hongshanzui oilfield is located in the northwest of Junggar basin. There are many reverse faults formed in this area,which affect the exploration of oil and gas. In order to analysis the controlling effect of faults on sand bodies,this article takes Upper Urho formation P 3 w 2,using the abundant analysis of drilling and seismic data in this area. On the basis of layer thickness,sand bodies distribution and fault analysis,analysis the controlling effect of contemporaneous reverse faults on sediment deposition process “source-transportationsink”,then analysis the controlling effect of sand bodies. P 3 w 2 of H89 block was influenced by the sedimentary basement palaeotopography,the range of layer distribution was limited,only east-west ribbon in the middle part,thickening from west to east gradually,the whole geomorphological feature was a deep valley groove. The faults grew well,east-west reverse faults controlled the distribution of boundaries and trend of groove. The south-west reverse faults controlled the trend of groove. In H89 block,there are 3 reverse south-west faults which divided the area into three natural reservoirs. The small anticlines formed on the hanging wall have secondary resource function. The depression formed on the footwall is the main unloading and converging area of sediments. The superposition of the front reverse fault increases the slope of the terrain slope belt,the depositions passed this area but not settled,this is the “transportation” of the sediment deposition process. Therefore,three sedimentary modes are established: the sandbody aggregate mode with flow change direction,the anticlinal sand accumulation mode,and the steep slope sand enrichment mode. The sand bodies of P 3 w 2 was controlled by groove and contemporaneous reverse faults in H89 block. Thus,the sand bodies were vertical distribution along the groove. South-north reverse fault controlled “source-transportation-sink” of sediment deposition process,and controlled the sand bodies distributio
作者
陈政安
周隶华
李凤杰
张梦露
CHEN Zheng-an;ZHOU Li-hua;LI Feng-jie;ZHANG Meng-lu(Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China;No.1 Production Plant of Xinjiang Oilfield Branch Company,Karamay 834000,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu 610059,China)
出处
《科学技术与工程》
北大核心
2019年第26期37-45,共9页
Science Technology and Engineering
基金
国家重点研发计划(2018YFC0604201)
成都理工大学沉积地质学创新团队基金(KYTD201703)资助
关键词
同生逆断层
砂体展布
源-渠-汇
上乌尔禾组
准噶尔盆地
contemporaneous reverse faults
sandbodies distribution
source-transportation-sink
Upper Urho formation
Junggar basin
