贝尔凹陷布达特群裂缝垂向封闭性与油气富集  

Fracture vertical sealing and hydrocarbon accumulation in Budate Group of Beier Depression

作　　者：刘玉萍[1] 

机构地区：[1]大庆职业学院继续教育培训部,黑龙江大庆163255

出　　处：《大庆石油地质与开发》2008年第4期35-38,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家"973"重点基础研究项目(2001CB209104)资助

摘　　要：通过岩心观察和成像测井资料分析得到,贝尔凹陷布达特群倾斜裂缝比垂直裂缝发育,其形成与分布主要受活动强度大的长期继承性断裂的控制。利用裂缝面压力和镜质体反射率资料,对贝尔凹陷布达特群倾斜裂缝和垂直裂缝垂向封闭性进行了评价,得到不同角度的倾斜裂缝在凹陷中部均是封闭的,仅在凹陷西北和东南边部开启,且随裂缝倾角增大,开启区范围增大。垂直裂缝在凹陷中部大部分地区开启,在苏德尔特潜山带中部以北地区和凹陷中南和东北边部地区封闭,封闭区在凹陷边部呈条带分布,在凹陷中部呈环带分布。通过油气分布与裂缝垂向封闭性评价结果分析得到,贝尔凹陷布达特群油气聚集与分布主要受垂直裂缝的控制。Through core observation and image logging data interpretation, it is found that the existence of dipping fractures in Budata Group of Beier depression are more often than vertical fractures, the formation and distribution of which are usually under the control of active long-period inherited faults. The vertical sealing ability of dipping fractures and vertical fractures in Budate Group of Beier Depression is evaluated using fracture plane pressure and vitrinite reflectance data, as a result of which, it is proved that dipping fractures at different dip angles are sealed in the middle part of the depression, but remain opening at the northwest and southeast margins of the depression, and what＇ s more, the opening area increases with the increment of dipping angle, Whereas the vertical fractures remain opening in most part of the middle depression, which are sealed only in northem part of the middle Sudeerte buried hill, the southern part of middle depression and northeast part of the depression. The sealing areas present banded distribution near the margin of the depres- sion and girdle band distribution in the middle part of the depression. Evaluation results of hydrocarbon distribution and fractures vertical sealing ability imply that hydrocarbon accumulation and distribution in Budate Group of Beier depression are mainly controlled by vertical fractures.

关 键 词：贝尔凹陷 布达特群 倾斜断裂 垂直裂缝 垂向封闭 裂缝面压力 镜质体反射率 

分 类 号：TE121[石油与天然气工程—油气勘探]