摘要
郯庐断裂带伊通段的构造活动对伊通盆地的形成与油气分布具有重要控制作用。通过对最新的地震、钻井、物探、露头等资料分析,认为郯庐断裂带伊通段新生代以来的构造演化可划分为三个阶段,即:古新世-始新世中期的左旋走滑挤压阶段、始新世中期-渐新世末期的右旋走滑伸展阶段和中新世-第四纪的右旋走滑和隆升阶段。其中第二阶段为主成盆期,控盆断裂活动特征具有南早北晚、由南向北迁移的规律,盆地沉积中心因此也从南西向北东迁移并靠近西北缘主断裂;第三阶段为盆地反转期,控盆断裂发生右行压扭和隆升,盆地东南缘发生拱张使得万昌构造带等早期形成的构造高部位油气藏遭受破坏,而盆地西北缘受侧向挤压则形成宽2～4km的西北缘断褶带,具有良好油气成藏条件和勘探潜力,是盆地新的找油领域。
Tectonic evolution of the Yitong part of the Tan-Lu fault zone controls the development of the Yitong basin and the distribution of oil and gas in it.Analysis of the new seismic data,well drilling,geophysical research,outcrop etc,shows that the Cenozoic tectonic evolution of the Yitong part of the Tan-Lu fault zone can be divided into three stages：left-lateral extrusion period（Paleocene-Middle Eocene）,right-lateral extension period（middle Eocene-later Oligocene）,and right-lateral extrusion and uplift period（Neogene-Quaternary）.The second stage is the most important period for the formation and evolution of the basin,during which the evolution of the Yitong part of the Tan-Lu fault zone was characterized by northwards migration of faulting,and accordingly,the northeastwards migration of sediment center.The third stage is the reversion stage of the basin,two boundary faults began right-lateral extrusion and uplift.The uplift and inversion destroyed the pre-existing hydrocarbon pool in the Jianshan and Wanchang structural belt on the southern-east edge of the basin,while the compression led to the formation of a 2 to 4 km wide fault-folds belt on the northern-west edge,which holds good hydrocarbon pooling conditions and maybe a promising area for oil and gas exploration in the Yitong basin.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2010年第3期340-348,共9页
Geotectonica et Metallogenia
基金
"构造与油气资源"教育部重点实验室开放基金项目(TPR-2009-27)
教育部科学技术重点项目(No.106113)
湖北省自然科学基金计划项目(2007ABC013)资助
关键词
盆缘断裂
右旋走滑
构造演化
郯庐断裂带
伊通盆地
boundary fault of sedimentary basin
right-lateral strike-slip
tectonic evolution
Tan-Lu fault zone
Yitong basin
