西南非洲外陆缘的滑塌构造

• 作 者: D.V.Dingle 王克宁
• 出 处: 国外油气勘探
• 发表日期: 1989年04期
• 关键词: 陆缘 滑塌构造 油气圈闭 生油层 地震分辨率 晚第三纪 旋转断块 油气勘探 地震剖面 双程反射时间

引言西南非洲外陆缘260000km~2的范围内均受到晚第三纪滑塌构造作用的影响。各种滑塌构造分布在沃尔维斯(Walvis)海岭东段与非洲大陆南端之间(约南纬20°至37°之间)。在南纬30°以北已发现四个不连续的滑塌带;但在南纬30°以南有几个(至少4个)相连的滑塌体,形成一个长约850km 的连续的条带(图1)。为了说明与这些滑

INTRODUCTION The outlying margin of Southwest Africa is affected by the Late Triassic slip structures in the range of 260000km ~ 2. Various slump structures are distributed between the eastern segment of the Walvis Ridge and the southern tip of the African continent (between about 20 ° and about 37 ° S). Four discontinuous slip zones have been found north of latitude 30 ° south; however, there are several (at least four) connected slip bodies south of 30 ° south latitude forming a continuous strip of about 850 km (figure 1). To illustrate these slippery