石油与天然气地质 ›› 1984, Vol. 5 ›› Issue (1): 55-59.doi: 10.11743/ogg19840107

• 论文 • 上一篇    下一篇

柯克亚油田帕卡布拉克组四、五段浊流沉积

丘东洲   

  1. 地质矿产部石油地质综合大队
  • 收稿日期:1983-05-04 出版日期:1984-03-25 发布日期:2012-01-16

TURBIDITE IN THE 4-5TH MEMBERS OF PAKABULAK FORMATION IN KEKEYA OILFIELD

Qiu Dongzhou   

  1. Research Institute of Petroleum Geology, Ministry of Geology and Mineral Resources
  • Received:1983-05-04 Online:1984-03-25 Published:2012-01-16

摘要:

柯克亚油田属塔里木盆地西南坳陷南缘背斜带。该油田位于背斜带西端的第二排构造,为一短轴背斜。其地表由上新统阿图什组(或固满组)组成,地下已钻穿中新统乌恰群,该群自下而上为克孜洛依组、安居安组和帕卡布拉克组。

Abstract:

The turbidity sediments are delt with here in the 4th and 5th members of the Miocene Pakabulak Formation in Kekeya Oilfield in Tarim Basin.They are composed of rhythmic sequence of sandstone and mudstone with low mineral and structural maturity.The probability curve of particle size is a smooth one with gentle slope,indicating that the sediments are transported in suspension.The A-D,A-C and A-B intervals of Bouma sequence are of ten seen in these turbidity sediments,without remarkable evidence of sliding.There-fore,they were presumably deposited on the steep flank of the lacustrine ba-sin rapidly in case of diluvial.The index ρ(proximity to erosion area)isabout 70-80%,this fanhead feature proves again a lacustrine turbidite quite close to erosion area.The major reservoir of this oilfield is closely related to turbidity sand bo-dies.The porosity of the reservoir in its western part,being near the erosion area,is poor,but it gets obviously better between the fanhead and its middle part,where most of wells with high productivity are actually located.It seems that Mt.Kunlung was obviously uplifted when the Pakabulak Formation was forming.This heralds that turbidity sediments similar to those found in Kekeya Oilfield could be expected in the Yiliyas and Heshilafu region of Shaehe County,Fusha regions of Yecheng County and Duwa region of Pishan County.