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库车坳陷第三系盐膏质盖层特征及其对油气成藏的控制作用
引用本文:周兴熙.库车坳陷第三系盐膏质盖层特征及其对油气成藏的控制作用[J].古地理学报,2000,2(4):51-57.
作者姓名:周兴熙
作者单位:中国石油天然气集团公司 石油勘探开发科学研究院 北京 100083
摘    要:库车坳陷的第三系盐膏质区域盖层具有厚度大、分布广、岩性致密、突破压力高、地层压力也很高的特点,属于封闭性特别强的区域盖层;在坳陷的成藏系统中,起着应变分隔带、流体压力屏障、油气成藏机制分界线的作用;在其上下出现了两种成藏模式-克拉苏模式和大宛齐模式。这套盖层是坳陷油气富集的最重要条件之一,也是我国最优良气田-克拉2大气田形成的最重要条件之一。在其下还会有更多的克拉2型的气田存在。

关 键 词:库车坳陷  第三系  油气成藏  成藏模式  盐膏质盖层
修稿时间:2000年7月4日

THE FEATURES OF TERTIARY HALITE-GYPSUM CAPROCKS AND THEIR CONTROL ON FORMATION OF OIL AND GAS POOLS IN KUQA DEPRESSION
Zhou Xingxi.THE FEATURES OF TERTIARY HALITE-GYPSUM CAPROCKS AND THEIR CONTROL ON FORMATION OF OIL AND GAS POOLS IN KUQA DEPRESSION[J].Journal of Palaeogeography,2000,2(4):51-57.
Authors:Zhou Xingxi
Affiliation:Research Institute of Petroleum Exploration and Development CNPC, Beijing 100083
Abstract:The Tertiary halite gypsum sediments constitute the regionally high quality caprocks, deposited from semiclosed bay and lagoon enviconments.These caprocks are characterized by very large thickness(1000m), broad distribution and high compactness, very high pore pressure and a high breakthrough pressure(>60MPa). They play the role of the strain separation zone, pore pressure barrier and the dividing of two pool forming models, i.e. the Kelasu model and the Dawanqi model in the Kuqa Depression. The Kelasu model takes effect below these regional caprocks, with the overpressure in anticline traps,and the Dawanqi model takes effect above thes regional caprocks, with the normal pressure in many kinds of traps.The caprocks are one of the most important conditions of the oil and gas enrichment in this depression and also one of the most importment forming factors of the Kela 2 gigantic gas field. Somemore gas fields similar to Kela 2 can be discovered under the Tertiary caprocks.
Keywords:Kuqa Depression  Tertiary  halite  gypsum regional caprocks  pool  forming controlling process  pool  forming model
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