盐城凹陷断层封闭性  

Study and Evaluation of Fault Sealing in Yancheng Sag

作　　者：马洪[1] 柳广弟[2] 詹宁 朱立林 石金华 

机构地区：[1]中国石油石油勘探开发科学研究院,北京100083 [2]中国石油大学资源与信息学院,北京102249 [3]中国石油吐哈油田分公司钻井三公司,新疆鄯善838200 [4]中国石油青海油田分公司采油一厂开发室,青海敦煌816400

出　　处：《新疆石油地质》2007年第6期710-713,共4页Xinjiang Petroleum Geology

基　　金：国家重点基础研究发展规划"973"项目;天然气藏动态形成过程和富集程度(2001GB209103)资助

摘　　要：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。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.

关 键 词：盐城凹陷 断层封闭性 泥岩涂抹系数 断面正压力 地震层速度 

分 类 号：TE112.5[石油与天然气工程—油气勘探]