西北地区石油地质特征及油气前景

CHARACTERISTICS OF PETROLEUM GEOLOGY SETTING AND HYDROCARBON PROSPECTS OF NORTHWESTERN CHINA

康玉柱

Kang Yuzhu

地质矿产部西北石油地质局

Northwestern Bureau of Petroleum Geology, Ministry of Geologyand Minerals

西北地区(贺兰山——六盘山以西、昆仑山——秦岭以北)主要受南北挤压力和南北对扭力作用,产生了以北西向的西域系和东西向的纬向系为主干的多构造体系的复合.形成了与我国东部截然不同的区域构造特征.1.地壳结构:莫霍面一般为36—60公里;地幔上隆部位常常是中新生代厚度变化的斜坡带上.2.区域构造格架:(1)西域系:由阿尔泰构造带、博罗霍洛——祁连构造带及巴楚——奇曼塔克构造带等为骨干和相应的沉降带所组成.发生于早古生代,晚古生代活动最强烈,中新生代仍有活动.

The northwestern China (the area west to the Helan Shan-Liupan Shan and north to the Kunlun Shan-Qjnling) occupies an area of 2 million km2. It takes the Xiyu System trending NWW and the latitudinal system trending EW as the back bone of the tectonic framework. The Hecynian Movement caused the tectonic system to take shape and develop forward. The Meso-Cenozoic basins are superimposed on different Paleozoic sediments, having oil-generating combinations with multiple series and multiple type of hydro-carbon deposits. Local structures were developed well within the basins. Hundreds of oil and gas shows and 42 oil or gas fields (or deposits) have been found in this area so far. Oil and gas prospect seems to be best in the Junggar, Tarim and Qaidam Basins, being thought as a promising area for the search of giant oil and gas fields. There is also a good oil and gas prospect in the Turpan-Hami, Santang Hu and Gansu Corridor Basins.

https://doi.org/10.11781/sysydz198403229