贝尔凹陷大一段下部旋回泥岩盖层封闭能力综合评价  

Comprehensive evaluation of seal ability of mudstone cap rocks in Lower cycle of K_1d_1 in Beier Depression in Hailaer Basin

作　　者：黄劲松[1] 刘长国[2] 牟广山 

机构地区：[1]大庆石油学院地球科学学院,黑龙江大庆163318 [2]大庆油田有限责任公司第二采油厂,黑龙江大庆163414 [3]大庆榆树林油田开发有限责任公司,黑龙江大庆151100

出　　处：《大庆石油学院学报》2009年第6期19-24,共6页Journal of Daqing Petroleum Institute

基　　金：国家"973"重大基础研究项目(2001CB209104);黑龙江省博士学科点专项科研基金项目(20060220002)

摘　　要：以层序地层划分为基础,利用岩性组合、测井曲线变化规律,并结合盆地的发育演化过程将大磨拐河组一段划分为上下2个旋回.其下部旋回内泥岩盖层封闭能力对下部南屯组油分布具有重要的控制作用.通过对不同深度泥岩盖层取样并实测泥岩盖层的排替压力,同时根据探井的声波时差随深度变化的数据,建立了贝尔凹陷排替压力与声波时差之间关系.利用探井声波时差数据研究了大一段下部旋回内泥岩盖层的排替压力及超压特征.通过泥岩盖层单层厚度、累计厚度、泥地比、排替压力和超压的分布特征研究得到,大一段下旋回内泥岩盖层综合封闭能力以好和中等为主.通过贝尔凹陷大一段下旋回内泥岩盖层保存条件与南二段工业油气流井分布之间关系研究得到,南二段工业油流井均分布在大一段泥岩盖层综合封闭能力为好和较好的地区,表明大一段下旋回内泥岩盖层保存能力是贝尔凹陷南二段油气聚集成藏的重要条件.On the basis of sequence stratigraphic division,using variation of lithologic association and logging curve,and combined with development and evolution processes of the basin,the 1st section of Damoguaihe formation was divided into upper and lower cycles. Seal ability of mudstone cap rocks in lower cycle controlled the distribution of oil in underlying Nantun formation. By sampling mudstone cap rocks in different depths and measuring their displacement pressures,the relation between displacement pressure and interval transit time in Beier depression was established according to interval transit time data of exploration wells changing with depth. By use of interval transit time data,the characteristics of displacement pressure and overpressure of mudstone cap rocks in lower cycle of K1d1 was studied. By research on single layer thickness,total thickness,ratio of mudstone/formation thickness,displacement pressure and overpressure distribution characteristics of mudstone cap rocks,it was considered that comprehensive seal ability of mudstone cap rocks in lower cycle of K1d1 was middle and good in main. By research on the relation between preservation conditions of mudstone cap rocks in lower cycle of K1d1 and distribution of industrial oil-gas flow wells of K1n2 in Beier depression,it was concluded that industrial oil flow wells of K1n2 were all distributed in the regions where comprehensive seal ability of K1d1 mudstone cap rocks was good or better. It was showed that preservation ability of mudstone cap rocks in lower cycle of K1d1 was important condition for the accumulation of oil and gas in K1n2 in Beier depression.

关 键 词：贝尔凹陷 大一段下旋回 排替压力 超压 盖层封闭能力 

分 类 号：TE121.13[石油与天然气工程—油气勘探]