摘要
泥岩裂缝油气藏在中外含油气盆地中均有发现,并且泥岩裂缝作为一种隐蔽输导体系,越来越受到广大学者的重视。从泥岩裂缝的形成机制出发,定量分析了济阳坳陷泥岩裂缝的主控因素,并采用Eaton法计算了泥岩的破裂压力梯度。运用实际统计资料推算出断层活动性与裂缝带宽度之间的相关公式。研究结果表明,泥岩裂缝的形成机制为构造应力和异常压力的耦合,主控因素为应力和压力,即应压双控;东营凹陷岩层破裂产生泥岩裂缝的平均下限压力系数为1.38;断层活动性越强,越容易产生裂缝,裂缝的展布范围越大;断层的生长指数与裂缝带宽度具有正相关性。
Fractured mudstone reservoirs have been found in petroliferous basins both in China and other countries.As one of the subtle transportation system,fractures in the mudstones have been paid more and more attention.The main controlling factors of fractures in the mudstone were quantitatively analyzed,and the fracture pressure gradient of mudstones was calculated using Eaton method.Correlation formula between fault activity and fracture width was established according to actual statistic data.The research result shows that the coupling of tectonic stress and abnormal pressure controls the fracture development in the mudstone,and the dominant factors are stress and pressure.In Dongying Depression,the minimum pressure coefficient of mudstone fracturing is 1.38.Stronger fault activity,easier crack forming and larger range fissures spreading.The correlation of fault growth index and fracture width is positive.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2008年第5期31-33,37,共4页
Petroleum Geology and Recovery Efficiency
基金
中国石化股份公司项目"输导体系与输导能力量化研究"(P08037)
关键词
泥岩裂缝
破裂压力梯度
生长指数
裂缝带宽度
济阳坳陷
fractures in the mudstones
fracture pressure gradient
fault growth index
fracture zone width
Jiyang Depression
