复杂断块油田内部低次级断层封闭性定量研究

断块油田内部低次级断层，由于规模小、区域地质特征、成藏条件存在差异性，应用Yielding的断层封闭性评价方法预测圈闭的油藏高度以及油水分布与实钻吻合度不高。为了提高预测精度，提出利用油田内部钻井、流体压力等资料，通过建立断块的深度压力模型，对断层泥岩比率I_SGR与过断层压力差（△p）进行拟合确定符合区域成藏特征的定量评价关系式，并根据拟合图上封闭失效区域识别断层封闭的I_SGR参数下限，二者结合定量判断断层封闭能力的评价方法。运用该方法对K油田4井区的断块进行研究发现，4井区南块I油组与中块Ⅱ油组上、下段为同一油水系统，研究结果得到油藏动态认识的支持。

A Predition Quantitative Study on the Sealing of Secondary Fault in Complex Fault Block Reservoir

Due to the small scale,regional geological characteristics and differences in hydrocarbon accumulation conditions,the height of the oil column and distribution of oil and water in secondary fault in developed oilfields with yielding fault sealing evaluation method doesn’t conform to the actual drilling.In order to improve prediction accuracy,this study establishing a depth-pressure model with drilling,fluid pressure and other materials,and by fitting the shale gouge ratio(ISGR) with across fault pressure difference(Ap),we determine the quantitative evaluation relationship consistent with regional characteristics,and identify the lower limit of the ISGR of the fault sealing according to the failure area of the fitted graph envelope.And quantitative judgment of fault sealing ability is made rough comnination of the two methods.The study of the fault block in Area 4 of K Oilfield reveals that the south block in I Formation and the middle block in the upper and lower section of Ⅱ Formation are the same oil and water system.The research are supported by the dynamic of the reservoir.