断层泥比率(SGR)及其在断层侧向封闭性评价中的应用

SHALE GOUGE RATIO AND ITS APPLICATION IN THE FAULT SEALESTIMATION ACROSS THE FAULTED ZONE

断层封闭性的评价是研究控制油气运聚的断裂输导体系的核心问题。从1966年Smith建立断层封闭性理论模型之后,国内外许多学者在评价预测断层封闭性方面做了大量的研究工作,并在近10年取得很大进展,提出了许多有效的定性或定量评价方法。在前人研究的基础上,对粘土涂抹作用造成的断层侧向封闭性进行了深入分析。应用Yielding等(1997)提出的断层泥比率(SGR)法及其与断层侧向封闭性之间的定量关系,以江汉盆地西南缘主干断层为例,计算了该区主干断层的断层泥比率,研究了对这些断层在主要目的层形成的侧向封闭性及其对油气运聚所形成的控制作用。认为断层泥比率是研究断层侧向封闭性的一个有效指标。

The estimation of fault sealing is a crucial issue in studying petroleum migration and accumulation in sedimentary basins. In 1966 Smith has proposed the theoretical model of Fault Sealing, since then, many scholars have done a lot of work in estimating and predicting the fault seal in clastic strata, and have made great progress of the study during last 10 years.The paper analyses deeply on the lateral fault seal by clay smear on the basis of the precensors studies. Using the Shale Gouge Ratio by Yielding etc in 1997 and its quantitative relationship with the fault seal across the faulted zone, we apply it to several important faults in the southwest of Jianghan Basin, calculate their Shale Gouge Ratio values and analyse the relationship between these Shale Gouge Ratio values and the fault seal across the faulted zone, furthermore, we study the fault seal with the oil migration and accumulation. As a result, it can be proved that Shale Gouge Ratio is an efficient index in studying the lateral fault seal.