摘要
使用Allan图法、泥岩涂抹因子法和断层泥比率法对大庆油田朝长地区扶余油层8条断层的侧向封闭性进行了研究,使用断面正压力结合泥岩塑性变形强度极限的方法对其垂向封闭性进行了研究,分别确定各断层在嫩江期末、明水期末和现今3个时期的侧向封闭性和垂向封闭性。嫩江期末除6号断层外其他断层均开启,便于青山口组烃源岩排出油气的充注,6号断层附近区域因其封闭而缺乏油源;明水期末断层开始封闭;到现今时期,除5号断层外其他断层均封闭,能够对已形成油藏提供很好的阻挡。5号断层3个时期对油气都缺乏有效阻挡,基本只起到了通道的作用。
Using Allan graphic method, shale smear factor method and fault gouge ratio method, this paper studied the lateral sealing characteristics of 8 faults in Fuyu reservoir in Chaochang area, Daqing oilfield. By use of the normal pressure of fault section and the intensity limit of plastic deformation of mudstone, the vertical sealing characteristics of these faults are studied. The lateral and vertical sealing degrees of these faults are identified in Nenjiang stage, later Mingshui stage and nowadays. Except fault No. 6, other faults were opening in later Nenjiang stage, so it is easy to delivery oil and gas from Qingshankou source rock, and the nearby region of fault No. 6 is lack of oil sources. Up to present, except fault No. 5, other faults are sealed, these sealed faults play a role of barrier to hydrocarbon migration from the already existing reservoir. Because fault No. 5 is lack of effective blocking for hydrocarbon migration in three periods, so it basically serves as a channel.
出处
《现代地质》
CAS
CSCD
北大核心
2009年第5期880-886,共7页
Geoscience
关键词
朝长地区
断层
封闭性
演化
Chaochang area
fault
closure property
evolution
