发育规模小而多断层垂向封闭性研究方法探讨

Discussion of vertical seal research method on multi and small scale developed faults

在断层垂向封闭机理及其影响因素研究的基础上,利用最大主压应力方向与断层走向之间的夹角大小建立了一套发育规模小而多断层垂向封闭性的研究方法,并以松辽盆地滨北地区T2反射层发育规模小而多断层为例,对其垂向封闭性进行了研究,结果表明滨北地区T2反射层垂向封闭性好和较好的断层明显多于垂向封闭性中等和差的断层,尤其是滨洲铁路附近,油气聚集和保存条件相对较好,可能是滨北地区扶杨油层能在此获得天然气显示的一个重要原因之一,这表明该方法用于研究发育规模小而多断层垂向封闭性是可行的。

Based on study of vertical seal mechanism of fault and its influential factors, using the size of angle between orientation of maximum principle stress and strike direction of fault, a method is established to study vertical seal of faults developed in large number and small scale. Taking large number and small scale faults developed in T2 reflector in Binbei area in Songliao Basin as an example, a study is carried out on its vertical seal. The result indicates that the quantity of faults of good and favorable vertical seal degree are obviously larger than that of medium and poor degree. Particularly in areas near Binzhou railway, the hydrocarbon accumulation and preservation conditions are better than oth- er areas. It is one of important reasons why gas show is discovered in Fuyang reservoirs in this area. This proves that the method is feasible to study vertical seal of faults developed in large number and small scale.