渤海盆地潜山下古生界岩溶古地貌特征分析——以W油气田为例

发布时间：2018-10-05 21:25

【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。
[Abstract]:Paleogeomorphology represents the background of stratigraphic sedimentation and diagenesis, which is of great significance to the study of reservoir development and evolution. Taking W oil and gas field in Bohai Basin as an example, on the basis of seismic data collected and processed again, combined with regional tectonic background, drilling and logging data, Based on the combination relationship between the residual thickness of weathering crust of buried hill and the thickness of Shahejie formation above buried hill surface and its relative thickness variation characteristics, a geological model for comprehensive interpretation of paleogeomorphology of karst weathering crust in lower Paleozoic of buried hill is established. The distribution pattern of karst paleogeomorphology in the lower Paleozoic of buried hill was restored by using the residual thickness method and the impression method, and the results obtained by the single method were overturned. The results show that there are three secondary paleogeomorphological units and six paleogeomorphological units in karst highlands, karst slopes, karst basins, residual hills, terraces, shallow valleys, gullies and remnant terraces in the study area. The northwestern part of the study area is the karst highland, the south is the karst basin with limited distribution, and the karst slopes are mainly distributed in the north, middle and east of the study area, with the widest distribution range.
【作者单位】：中海石油(中国)有限公司天津分公司渤海石油研究院;
【分类号】：P618.13;P931.5

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