石油与天然气地质 ›› 1994, Vol. 15 ›› Issue (3): 226-234.doi: 10.11743/ogg19940306

• 论文 • 上一篇    下一篇

鄂尔多斯地区西缘及南缘中奥陶统平凉组重力流沉积

吴胜和1, 冯增昭1, 张吉森2   

  1. 1. 石油大学, 北京102200;
    2. 长庆石油勘探局勘探开发研究院, 甘肃庆阳745101
  • 出版日期:1994-09-25 发布日期:2012-01-16

SEDIMENTOLOGY OF GRAVITY FLOW DEPOSITS OF MIDDLE ORDOVICIAN PINGLIANG FORMATION IN WEST AND SOUTH MARGINS OF ORDOS

Wu Shenghe1, Feng Zengzhao1, Zhang Jisheng2   

  1. 1. The University of Petroleum, Beijing;
    2. Burean of Petroleum Exploration, Changqin Oilfield, Cansu
  • Online:1994-09-25 Published:2012-01-16

PDF (PC)

645

被引次数

47

摘要：

鄂尔多斯盆地西缘和南缘的中奥陶统平凉组重力流沉积十分发育.重力流可分为碎屑流、浊流、颗粒流三类.浊流沉积一为碳酸盐岩型,一为碎屑型.重力流的沉积、分布受同生断裂和四种沉积格局(裂堑型、裂坡型、台坡型及台堑型)的控制,可成为重要的油气储集岩.本文着重讨论了这种重力流沉积的发育特征和分布规律.

关键词: 鄂尔多斯, 重力流, 平凉组, 同生断裂, 沉积格局

Abstract:

Pingliang Formation of Middle Ordovician developed only in west and south margins of Ordos Basin in North China Platform.Two kinds of gravity flow deposits,carbonate and elastic rocks developed in the formation.The carbonate gravity flow deposits include debris flow deposits (mainly breccialimestone),turbidites(mainly calcarenite) and grain flow deposits(echinoderm-elastic grainlimestone).Clastic gravity flow deposits are mainly turbidity flow deposits,consisting of conglomerate and sandstone.The formation and distribution of the gravity flow deposits were governed by simultaneous faulting and sedimentary framework.The latter includes four types:1.fracture-grabon; 2.fracture-slope; 3.platform-slope;4.platform-graben.The simultaneous fault is both an important factor in the formation of slopes and the source province of the gravity flow.Down along the slopes,collapse,slump,debris flow(and gravity flow), high and low density turbidity flow deposits occur sequentially.There are different complexes of simultaneous faults,and in turn differentia of gravity flow deposits and various sedimentary frameworks in the region.The gravity flow deposits are potential important hydrocarbon reservoirs.