青东凹陷新生代构造应力场特征及其与油气运聚的关系.docVIP

 青东凹陷新生代构造应力场特征及其与油 气运聚的关系# 李伟1，杨智峰2,3，韩帅1，贾海波2,3* 5 10 15 20 25 30 35 40 45 （1. 中国石油大学（华东）地球科学与技术学院，山东 青岛 266580； 2. 中国石油大学（北京）油气资源与探测国家重点实验室，北京 102249； 3. 中国石油大学（北京）地球科学学院，北京 102249） 摘要：运用二维有限元的方法对青东凹陷新生代构造应力场进行数值模拟，探讨了应力场与 油气运聚的关系。结果表明：EkEs4L 沉积期青东凹陷处于 N（N）ES（S）W 拉张应力场 之下，以 NW、近 EW 向断裂体系发育为主，郯庐断裂左旋走滑作用较弱；Es4UEs2 沉积期 处于 N（N）WS（S）E 的拉张应力场之下，郯庐断裂转为右旋走滑；Es1Ed 沉积期青东凹 陷整体处于右旋剪切构造应力场之下，拉张应力减弱；Ed 末期青东凹陷处于为右旋挤压应 力场，郯庐断裂转为右旋压扭；NgNm 沉积期右旋剪切和拉张应力均较弱。青东凹陷成藏关 键时期有利生烃区带产生的油气在 NS、N（N）WSSE 最大主应力作用下运移，现今盆地最 小主应力的低值区和剪应力的高值区为油气有利的运聚区带。 关键词：构造应力场；新生代；数值模拟；油气运聚；青东凹陷 中图分类号：P548 Cenozoic Tectonic Stress Field Characteristics and Its Control to Hydrocarbon Accumulation in Qingdong Sag Li Wei1, Yang Zhifeng2,3, Han Shuai1, Jia Haibo2,3 (1. School of Geosciences, China University of Petroleum, ShanDong QingDao 266580; 2. China University of Petroleum State Key Lavoratory of Petroleum Resource and Prospecting, Beijing 102249; 3. College of Geosciences,China University of Petroleum, Beijing 102249) Abstract: After using two dimension finite element method to implement numerical simulation on the cenozoic paleo-tectonic stress field of Qingdong Sag, the difference and space distribution regularity of tectonic stress field in Cenozoic different geological history stages were analyzed. Furthermore, the relationship between the tectonic stress field characteristics and hydrocarbon migration was discussed. The result showed that in Kongdian and the lower forth stage of the Shahejie period, Qingdong Sag was located in N(N)W~S(S)E tensional stress field, the strikes of the main faults were NW and EW. Tanlu fault sinistral strike slip was weak and the tension effect was stronger than that of the strike slip. During the above period Qingdong, Sag experienced structural transformation. From the upper forth stage to the second stage of the Shahejie period, Qingdong Sag was located in N(N)W~S(S)E tensional stress field. Tanlu fault became dextral strike slip and the strike slip and tension were b