摘要
古地貌代表地层沉积和成岩作用的背景,对研究储层的发育和演化具有重要意义。以渤海盆地W油气田为例,在重新采集处理的地震资料基础上,结合区域构造背景、钻井、测井资料,根据连井对比剖面潜山风化壳残余厚度和潜山面之上沙河街组厚度的组合关系及其相对的厚薄变化特点,建立综合解释潜山下古生界岩溶风化壳古地貌的地质模型。综合利用残余厚度法和印模法恢复了潜山下古生界岩溶古地貌的分布格局,颠覆了单一方法研究得到的结果。研究结果显示:研究区分布岩溶高地、岩溶斜坡、岩溶盆地3个二级古地貌单元和台地、残丘、阶坪、浅洼、沟谷、残台6个三级古地貌单元。其中研究区西部偏北地区为岩溶高地,南部为分布局限的岩溶盆地,北部、中部和东部主要分布岩溶斜坡,分布范围最广。
Palaeogeomorphology represents the background of sedimentation and diagenesis,which is important to study the development and evolution of the reservoir. Taken W oilfield in Bohai bashin as an example,on the basis of reacquisition and reprocessing the seismic data,the geological model that used for interpreting the palaeogeomorphology of karst weathering crust in buried hill lower paleozoic erathem has been established,combined with regional tectonic setting,drilling,logging data and based on the comparison of buried hill profile that formed by weathering crust residual thickness and shahejie fromation thickness as well as relevant thickness change. Comprehensive use of residual thickness method and impression method has restored the distribution pattern of buried hill lower paleozoic karst landform,and overthrown the results obtained from a single method study. Research results showed that there were three two-level ancient landform units including plateau,slope,basin,and six three-level ancient landform units,including terrace,residual hill,flat,shallow depression,gully order. The northwestern part of study area is karst highland,the southern part is limited karst basin,but the north,middle and east parts are distributed widely with karst slopes.
出处
《非常规油气》
2016年第6期31-35,共5页
Unconventional Oil & Gas
关键词
岩溶古地貌
渤海盆地
下古生界碳酸盐岩
潜山
残余厚度法
印模法
Palaeogeomorphology
Bohai Basin
Lower Paleozoic carbonate rocks
Buried hill
the residual thickness method
impression method
