摘要
为了研究不同填充形式断层垂向封闭性,将断层分为砂质填充和泥质填充2种类型。通过不同填充形式断层断裂带特征分析,对其垂向封闭机理进行了研究,得到泥质填充断层主要是通过泥岩塑性变形流动堵塞断层紧闭后遗留下来的渗漏空间形成垂向封闭,而砂质填充断层则主要是通过SiO2和CaCO3沉淀胶结形成垂向封闭。通过断层面压力是否达到泥岩塑性变形极限和SiO2和CaCO3是否发生沉淀,分别建立了一套不同填充形式断层垂向封闭性的研究方法,并将其应用于海拉尔盆地乌尔逊凹陷Wu39号断层在南一段和大一段的垂向封闭性研究中,结果表明Wu39号断层在大一段内具较好的垂向封闭性,而在南一段垂向封闭性差。这一研究结果与该断裂附近油气分布有较好的吻合关系,表明该方法用于不同填充形式断层垂向封闭性研究是可行的。
In order to study vertical seal of fault with different filling forms, fault was divided into two types, one is filled by mudstone, another is filled by sandstone. By the analysis to characteristics of fault zone with different filling form, vertical seal mechanism was studied. It was considered that fault filled by mudstone was sealed by plastic deformation flow of mudstone and fault filled by sandstone was sealed by deposition of silica and carbonate. By pressure on fault surface equal to or not plastic deformation limit of mudstone and happen or not of silica and carbonate deposition, a method studying vertical seal of fault with different filling form, and applied them in studying vertical seal of Wu39 fault in .K1n1 and K1d1 of Wuerxun depression in Halaer Basin. The result indicates that vertical seal of Wu39 fault in K1d1 is good, vertical seal of Wu39 fault in K1n1 is bad. The research results tally with oil and gas distribution along fault. This indicates the method is practical to study vertical seal of fault with different filling form.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2008年第1期1-5,共5页
Petroleum Geology & Oilfield Development in Daqing
基金
国家973重点基础研究项目“高效大气田形成机理与分布研究”(2001CB209104)资助
关键词
断层
填充形式
垂向封闭
泥质填充
砂质填充
塑性变形
沉淀
fault
filling form
vertical seal
mudstone filling
sandstone filling
plastic deformation
deposition
