【果友自选自翻石油英语】之埃及苏伊士裂谷盆地July油田同构造沉积体记录了生长正断层的幕式运动——摘自AAPG 2003
Episodic growth of normal faults as recorded by syntectonic sediments, July oil field, Suez rift, Egypt
David A. Pivnik, Mohamed Ramzy, Brad L. Steer, Jay Thorseth, Zarif El Sisi, Ihab Gaafar, John D. Garing, and Robert S. Tucker
ABSTRACT: The July oil field is a major normal-fault–bounded structural block in the Suez rift basin, Egypt. It is adjacent to a major structural transfer zone, which has controlled sediment influx to the rift basin center for the past 20 m.y. The lower to middle Miocene Upper Rudeis Formation, part of the synrift stratigraphic sequence, records deformation of the July structural block. The formation contains abrupt lateral changes in thickness and facies, which record earlier phases of fault movement and deformation in the July field area that do not conform to the present-day structural configuration.
The Upper Rudeis Formation was deposited as turbidites in a submarine-fan system sourced from the western rift shoulder. It was deposited over and around bathymetric highs created by coeval fault displacement in the July field area. By studying thickness and facies patterns, we have determined that the present-day main bounding fault to the July block consisted of a series of unlinked fault segments, which linked after Upper Rudeis deposition. A subsidiary fault west of the block exerted the most control on thickness patterns, not the present-day main bounding fault. Thus, commonly used models of deposition in active half grabens are difficult to apply at July field.
题目：埃及苏伊士裂谷盆地July油田同构造沉积体记录了生长正断层的幕式运动
摘要：July油田是埃及苏伊士裂谷盆地以主干正断层为边界的构造块体。临近主构造调节带，过去20百万年受裂谷盆地中心沉积倾入体控制。中下中新世的上Rudeis组为部分同裂谷层序地层，记录了July构造体的变形机制。这套地层包括了厚度和相在侧向上突变，并记录了July油区与现今构造形态不相符合的早期断层运动及变形机制。
上Rudeis组是一套水下扇的浊流沉积体，其物源来自西部裂谷隆起处。靠近深水高地的沉积主要由July油区内同时期断层的位移引起的。通过研究地层厚度以及相模式，确认了July油区现今主边界断层是由一系列不连续的断层块组成，并与上Rudeis组后的沉积相联系。块体西部一次级断层对厚度样式起到主要的控制作用，而不是现今的主边界断层。所以，普通活动半地堑沉积模式并不能运用于July地区。
