断层垂向封闭性定量研究方法及其在准噶尔盆地白家海凸起东道海子断裂带应用

断层的垂向封闭能力主要取决于断面的紧闭程度和断裂带内填充物的岩性。在定量计算断面正压力和断层两侧地层泥地比的基础上,提出了断层垂向封闭因子(Fvs)的概念,并将其定义为断面正压力与断层两侧地层泥地比的乘积。通过该参数可以定量评价断层的垂向封闭能力。以准噶尔盆地东道海子断裂为例,在建立断层垂向封油、气能力评价标准的基础上,应用断层垂向封闭因子(Fvs)定量评价了该断裂带的成藏期垂向封闭性及现今垂向封闭性,分析了该断裂带对油气成藏的控制作用,得到较好效果。

The Quantitative Study Method and Its Application to Dongdaohaizi Fracture Belt in Baijiahai Uplift,Junggar Basin

The vertical sealing ability of fault is mainly controlled by the closed degree of fault fracture and the lithology of fault filling material.According to quantitative calculation of positive stress on fault plane and shale percentage contents,the fault vertical sealing factor(Fvs) is defined as the product of normal stress on fault plane and shale percentage contents of fault filling material.The vertical sealing ability of fault can be quantitatively evaluated by the parameter.The article applies the parameter to Dongdaohaizi fracture belt on Baijiahai uplift in Junggar Basin,sets up the vertical sealing criterion for oil and gas,quantitatively evaluates the fault sealing property and analyses its control effect.As a result,it can be proved that the vertical sealing factor is an efficient index in studying the vertical sealing ability of fault.