摘要
通过气油比、地层温度对比等研究,认为柯19井J1气藏和丘东气田J2x凝析气藏、小草湖地区J2x—J2s凝析气藏是相似的,是长期较高地层温度作用下油气裂解的产物。论证了柯柯亚J1b气层属于后期致密型气藏,即油气在早期(晚侏罗世—早白垩世)形成的古油藏中继续演化为凝析气藏。一定气油比的烃体系、较高的地层温度、压力是形成凝析气藏的必要条件,吐哈盆地下侏罗统满足形成凝析气藏的条件。吐哈盆地下侏罗统气藏主要受古构造控制,在丘东和小草湖地区有广阔的分布;在圈闭描述的基础上,指出近期勒东和红旗坎地区是下侏罗统天然气勘探的有利地区。
The study of gas-oil ratio and formation temperature shows that J1 gas of Ke19 well, J2x condensate gas reservoir of Qiudong area, and J2x--J2s condensate gas reservoir of Xiaocaohu area are similar, all of which are developed by oil-gas cracking under long-term high temperatures. It＇s demonstrated that J1b gas strata in Kekeya are late-dense gas reservoir, i.e. reservior that accumulated hydrocarbons at early stage （Later Jurassic-Early Cretaceous）. It evolves into today＇s gas condensate reservoir from a paleore- servior. Certain gas-oil ratio hydrocarbon system, and higher formation temperature and pressure are the necessary conditions for the formation of condensate gas reservoirs. The Lower Jurassic gas reservoir are widely distributed in the Qiudong and Xiaocaohu areas, are mainly controlled by paleo-structure. Based on trap description, it＇s pointed out that Ledong and Hongqikan are the advantageous regions for gas exploration in the Lower Jurassic.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2009年第3期342-347,共6页
Natural Gas Geoscience
关键词
温度
石油裂解
凝析气
潜力
方向
下侏罗统
吐哈盆地
Temperature
Oil cracking
Gas condensate
Potential
Direction
Lower Jurassic
Tuha Basin.
