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青东凹陷新生代构造应力场特征及其与油气运聚的关系

发表时间:2015-06-30  浏览量:1462  下载量:394
全部作者: 李伟,杨智峰,韩帅,贾海波
作者单位: 中国石油大学(华东)地球科学与技术学院;中国石油大学地球科学学院
摘 要: 运用二维有限元方法对青东凹陷新生代各演化阶段的古构造应力场进行数值模拟,明确了不同阶段构造应力场特征的差异性和空间分布规律,并探讨应力场与油气运聚的关系。结果表明:孔店—沙四下沉积期青东凹陷处于N(N)E—S(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,拉张强于走滑,为构造转型阶段;沙四上—沙二沉积期青东凹陷处于N(N)W—S(S)E拉张应力场之下,郯庐断裂转为右旋走滑,走滑、拉张程度均较强;沙一—东营沉积期青东凹陷整体处于右旋剪切构造应力场之下,区域拉张应力减弱;东营末期青东凹陷处于右旋挤压构造应力场,郯庐断裂带由右旋张扭转为右旋压扭;馆陶—明化镇沉积期青东凹陷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)W—S(S)E最大主应力作用下运移,分别运移至西部斜坡带、过渡带及东部的走滑带,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: 地质学;构造应力场;数值模拟;油气运聚;青东凹陷
Title: Cenozoic tectonic stress field characteristics and its control to hydrocarbon accumulation in Qingdong Sag
Author: LI Wei, YANG Zhifeng, HAN Shuai, JIA Haibo
Organization: School of Geosciences, China University of Petroleum; College of Geosciences, China University of Petroleum
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 results showed that in Kongdian and the lower forth stage of the Shahejie period, Qingdong Sag was located in N(N)E-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 of 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 both strong. During the first stage of the Shahejie and Dongying period, Qingdong Sag was located in dextral shear stress field and the regional tension of the basin became weaker. At the end of Dongying period, Qingdong Sag was located in dextral compressive tectonic stress field, Tanlu fault transformed from dextral tension into dextral compression. Between the Guantao and the Minghuazhen period, the dextral shear and tension of the Tanlu fault became weak. Under the and N-S, N(N)W-S(S)E major principal stress, within the key period of hydrocarbon accumulation, the favorable hydrocarbon zones of Qingdong Sag generated oil and gas and then migrated respectively towards west slope zone, transitional zone and east strike slip belt. And now the hydrocarbon favorable accumulation zones of Qingdong Sag is in the low tension value and high shear stress value zones of the minimum principal stress.
Key words: geology; paleo-tectonic stress fields; numerical simulation; hydrocarbon accumulation; Qingdong Sag
发表期数: 2015年6月第12期
引用格式: 李伟,杨智峰,韩帅,等. 青东凹陷新生代构造应力场特征及其与油气运聚的关系[J]. 中国科技论文在线精品论文,2015,8(12):1232-1242.
 
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