盐城凹陷断层封闭性

盐城凹陷断裂发育,断层封闭性评价具有一定的难度。根据前人的研究方法,结合实际地质情况,选取典型断层——盘1断层、盐3断层,应用泥岩涂抹系数建立该区断层侧向封闭性的评价标准值为1.26,根据泥岩塑性变形及破裂所能承受的最大正压力建立断层垂向封闭性有效正压力,区间为10～22MPa.通过对盐城凹陷主要断层的封闭性进行综合评价发现,该区断穿基底——阜一段的断层封闭性具有明显的分区性特点:南部断层封闭性较好,北部断层封闭性差,封闭断层的特征各不相同,与实际地质情况相吻合。

Study and Evaluation of Fault Sealing in Yancheng Sag

Yancheng sag is characterized by developed faults, which has influenced the fault sealing evaluation. According to previous studies, integrated with real geologic conditions, Pan-1 and Yan-3 faults are taken as typical faults to develop the criterion for fault lateral sealing evaluation. Using the mud smear coefficient, the criterion is given by 1.26. According to the sustain maximum normal pressure of mud plastic distortion and cracking, the effective normal pressure of fault vertical sealing ranges from 10 MPa to 22 MPa. The study shows that the sealing of fault penetrating into the basement (Member Fu-1) in Yancheng sag is characterized by regions: the south area is better, the north area is worse, such a varied feature is accordant with the real geologic situation.