贝尔凹陷大一段下旋回泥岩盖层内断层垂向封闭性评价  

Evaluation of vertical seal ability of the faults in mudstone cap rock in lower cycle of K_1d_1 in Beier depression

作　　者：牟敦山[1] 李润琪[2] 孙源[1] 刘玮盈 石巍[4] 

机构地区：[1]东北石油大学校办产业处,黑龙江大庆163318 [2]北京大学城市与环境学院,北京100871 [3]吐哈油田分公司消防科,新疆鄯善838202 [4]吐哈油田分公司吐鲁番采油厂,新疆鄯善838202

出　　处：《大庆石油学院学报》2010年第3期1-5,59,共6页Journal of Daqing Petroleum Institute

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

摘　　要：贝尔凹陷大一段下旋回泥岩盖层主要分布在贝西洼槽、呼和诺仁、苏德尔特、霍多莫尔和敖瑙海洼槽西南地区,最大厚度可达400m以上,盖层内发育有53条断裂,不仅使其有效厚度变小,而且使其封闭能力变差.利用盖层内断裂带岩石与未破坏盖层岩石之间压实成岩程度的差异,根据盖层排替压力与其埋深和泥质含量之间的关系,建立一套盖层内断裂带岩石排替压力的求取方法,并利用此方法对贝尔凹陷大一段下旋回泥岩盖层内被破坏断层垂向封闭性进行评价,得到贝尔凹陷大一段下旋回内断层垂向封闭性主要为中等和较好,有利于其内南二段油气的聚集与保存,是造成南二段油气富集的最主要原因之一.Beier depression was considered that mudstone cap rock in lower cycle of K1d1 was mainly distributed in Beixi sag,Huhenuoren,Sudeerte,Huoduomoer and southwest of Aonaohai sag.The maximum thickness is more than 400 m.There developed 53 faults,which not only decrease its effective thickness,but also make its seal ability worse.By use of the differences of compaction and diagenesis degree between rock in fault belts and cap rock,according to the relation between displacement pressure of cap rock and its buried depth and shale content,a method to calculate displacement pressure of rock in fault belts was established.And vertical sealing of faults in mudstone cap rock in lower cycle of K1d1 in Beier depression was studied by use of this method.It was concluded that vertical seal ability of faults in lower cycle of K1d1 in Beier depression was medium and better on the whole,which was favorable for accumulation and preservation of oil and gas in K1n2,and it was one of the main reasons that made K1n2 become the most enrichment layer of oil and gas.

关 键 词：贝尔凹陷 大一段 下旋回泥岩 断层 垂向封闭性 评价 排替压力 

分 类 号：TE121.13[石油与天然气工程—油气勘探]