摘要
由于布达特群沉积后经历了多期构造运动改造以及强烈的成岩作用甚至轻微的变质作用,对其沉积时期原型盆地的地质背景研究难度较大。在区域地质背景研究的基础上,根据岩心裂缝观察、成像裂缝统计以及试油显示,对苏德尔特地区布达特群潜山沉积微相及其与裂缝发育的关系进行了研究。结果表明:苏德尔特地区布达特群地层沉积相是以滨浅湖-半深湖相沉积环境背景下的扇三角洲相为主,主要发育滨浅湖的扇三角洲前缘亚相和半深湖区的前三角洲亚相,其中扇三角洲前缘亚相又可进一步分为水下分流河道、河口坝、扇末端、席状砂、水下分流间湾微相等。裂缝发育除受构造、断裂控制外,还受岩性、岩层厚度等因素的影响,因而沉积微相与裂缝的分布具有明显的相关性,即扇三角洲前缘扇末端和席状砂微相中的裂缝最为发育,试油效果最好;分流间湾、河口坝、水下分流河道微相裂缝发育依次变差,试油效果次之;前扇三角洲亚相裂缝发育最差,未见油气显示。
The research on clastic buried hills pool of Budate group in Sudeerte structural zone of Hailaer Basin finds that the influence of facies on fractures is also obvious. Influenced by structural movement, strong diagenesis and mild metamorphism, it is difficult to come back for geological background of basin during Budate group sedimentary period in Sudeerte structural zone. Based on the analyses of the regional geological background fractures description of cores, fractures statistic of imaging logs and formation testing, it is believed that Budate group is fan delta deposit of shore-shallow lake environment. The research area develops mainly fan-delta front and pre-fan delta subfacies. And the fan-delta front subfacies is subdivided into subaqueous distributary channel, mouth bar, terminal sand, sand sheet, interdistributary bay deposit, et al. The results show that besides structural movement and faulting, lithology and stratigraphic thickness affect fracture development. Sedimentary microfacies bears fine correlation with the degree of fracture development. Terminal sand, sand sheet are the most favorable places of fracture development where oil-bearing is the best. The degree of fracture development and oil-bearing are bad in turn in interdistributary bay deposit, mouth bar, subaqueous distributary channel. Pre-fan delta subfacies is the most unfavorable place of fracture development where oil is not found.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第4期1-6,共6页
Journal of China University of Petroleum(Edition of Natural Science)
基金
教育部第二届高校优秀青年教师教学科研奖励基金
中国石油大庆油田有限责任公司科研项目(41100366)
关键词
碎屑岩潜山
扇三角洲
沉积微相
裂缝
海拉尔盆地
布达特群
clastic buried hills
fan delta
sedimentary microfacies
fractures
Hailaer Basin
Budate group
