济阳坳陷新生代构造沉降特征  

Characteristics of Cenozoic tectonic subsidence in Jiyang depression

作　　者：郭兴伟[1,2] 施小斌[1] 丘学林[1] 吴智平[3] 李伟[3] 李凌[3] 

机构地区：[1]中国科学院边缘海地质重点实验室,中国科学院南海海洋研究所,广州510301 [2]中国科学院研究生院,广州510301 [3]中国石油大学地球资源与信息学院,山东东营257061

出　　处：《中国石油大学学报（自然科学版）》2006年第3期6-11,共6页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金资助项目(40204006);国家'973'项目(G2000046701)

摘　　要：利用回剥技术计算了济阳坳陷中4个主要凹陷的40余口井的构造沉降史,并通过与有限拉张模型对比,估算了单井的拉张系数。沉降特征分析结果表明,新生代以来,济阳坳陷的沉降基本上与断陷坳陷的构造背景相吻合;断陷期东营凹陷拉张量最大,惠民凹陷次之,车镇凹陷最小,最大沉降中心由西南向东北逐渐迁移;各凹陷单井的拉张系数受到控盆断裂的影响;距今14 Ma以来沉降加速,高沉降速率有随时间从坳陷东北部向西南部推进的趋势。Tectonic subsidence histories of more than 40 wells from four main sags in Jiyang depression were calculated by back-stripping technique. The extensional factors of the wells were estimated by comparing with the finite extension rate model. The analysis of the Cenozoic tectonic subsidence shows that the tectonic subsidence in Jiyang depression agrees well with the regional tectonic evolution. Of the four sags, Dongying sag is the mostly extended, Huimin sag is the second, and Chezhen sag is the least. The largest subsidence center moved from southwest to northeast gradually. The extensional factor of single well of these sags was affected by the boundary faults. Since 14 Ma, there was a subsidence acceleration stage, and the subsidence happened earlier and was stronger in the northeast than in the southwest.

关 键 词：济阳坳陷 新生代 构造沉降史 回剥 有限拉张模型 沉降速率 拉张系数 

分 类 号：TE121.2[石油与天然气工程—油气勘探]