贝尔凹陷布达特群潜山盖层封闭能力综合评价
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摘要
为考察贝尔凹陷布达特群潜山盖层封盖能力,利用钻井和地震资料对布达特群潜山盖层构成及其分布进行了研究.结果表明:贝尔凹陷布达特群潜山盖层主要由兴安岭群、南二段、南一段、大一段和大二段泥岩构成,兴安岭群和南二段分布面积最大,其次是南一段和大二段,最小为大一段.在盖层宏观发育及微观封闭特征研究的基础上,选取盖层累计厚度、泥地比、单层厚度、排替压力和异常孔隙流体压力5个参数,利用加权平均法对布达特群潜山盖层封盖能力进行了综合评价.结果表明,贝尔凹陷布达特群潜山盖层以中等、差为主,好盖层仅呈零星分布.通过盖层与油气分布关系研究表明,贝尔凹陷布达特群潜山油气主要分布在中等及其以上盖层区内,这说明中等及其以上盖层对布达特群潜山油气成藏与分布起到了重要的控制作用.
To study the sealing ability of caprocks of buried hill of Budate group in Beier depression,composition and distribution of caprocks of buried hill of Budate group was studied by drilling and seism data.There are Xinganling group,the first member of Damoguaihe formation and the second member of Damoguaihe formation.Distribution area of Xinganling group and the second member of Nantun formation is the largest,that of the first member on Nantun formation and the second member of Damoguaihe formation is the second largest,that of the first member of Damoguaihe formation is smallest.Based on the study of macrocosmic development characteristics and microcosmic sealing ability of caprock,choosing total thickness,ratio between mudstone thickness and stratum thickness,thickness of single layer replacement pressure and abnormal pore fluid pressure as evaluation parameters.The sealing ability of caprock of the buried hill of Budate group was studied by weighed average method.Caprock of buried hill of Budate group mainly own middle and bad seal ability,caprock with good seal ability distribution piecemeally.By study of relation between caprock and oil distribution,oil mainly distributes in caprock with middle and good sealing ability.It indicates that caprocks with middle and good sealing ability play an important role in accumulation and distribution of buried hill of Budate group in Beier depression.
To study the sealing ability of caprocks of buried hill of Budate group in Beier depression,composition and distribution of caprocks of buried hill of Budate group was studied by drilling and seism data.There are Xinganling group,the first member of Damoguaihe formation and the second member of Damoguaihe formation.Distribution area of Xinganling group and the second member of Nantun formation is the largest,that of the first member on Nantun formation and the second member of Damoguaihe formation is the second largest,that of the first member of Damoguaihe formation is smallest.Based on the study of macrocosmic development characteristics and microcosmic sealing ability of caprock,choosing total thickness,ratio between mudstone thickness and stratum thickness,thickness of single layer replacement pressure and abnormal pore fluid pressure as evaluation parameters.The sealing ability of caprock of the buried hill of Budate group was studied by weighed average method.Caprock of buried hill of Budate group mainly own middle and bad seal ability,caprock with good seal ability distribution piecemeally.By study of relation between caprock and oil distribution,oil mainly distributes in caprock with middle and good sealing ability.It indicates that caprocks with middle and good sealing ability play an important role in accumulation and distribution of buried hill of Budate group in Beier depression.
引文
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[5]付广,吕延防,杨勉.超压泥质岩盖层封闭油气机理的新认识[A]∥宋岩,魏国齐,洪峰,天然气地质研究及应用[C].北京:石油工业出版社,2000:219-223.
[2]陈守田,刘招君,崔凤林,等.海拉尔盆地含油气系统[J].吉林大学学报:地球科学版,2002,32(2):151-154.
[3]王家亮,张金川,张杰,等.海拉尔盆地贝尔凹陷的油气运聚分析[J].现代地质,2003,17(4):459-465.
[4]罗群,庞雄奇.断陷盆地群的含油气系统特征—以海拉尔盆地乌尔逊、贝尔凹陷为例[J].新疆石油地质,2003,24(1):27-30.
[5]付广,吕延防,杨勉.超压泥质岩盖层封闭油气机理的新认识[A]∥宋岩,魏国齐,洪峰,天然气地质研究及应用[C].北京:石油工业出版社,2000:219-223.
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