红车断裂带断层封闭性的地球化学研究

断层在油气运移及成藏中起双重作用，如何评价断层，对油气勘探开发有重要作用。以准噶尔盆地西北缘红车断裂带为例，根据断裂带南、北段储层中油气的组成差异，研究该断裂在不同地质时期对油气的保存与破坏作用。指出燕山期的构造运动使红车断裂带南段和北段的受力强度不同，存在非均衡性，它对油气的控制作用也不相同。相对而言，断裂带南段封闭性更好，对天然气的保存更为有利，从而形成白垩系气藏，而北段存在天然气散失作用，使本该形成的凝析气藏因天然气散失变为轻质油藏。

The Geochemistry Research on the Sealing Feature of Fault in Hongche Faults

The fault has dual functions in migration and accumulation of oil and gas,the one is to destruct hydrocarbon reservoir,another is to seal oil and gas.So,evaluation of fault role is very important in the exploration and development.Taking Hongche fault belt in northwest Junggar basin as example,based on the oil-gas composition difference of the reservoirs located on the north and south side of the belt,the fault role in oil-gas destruction and preservation in different geologic times.It is showed that the difference of fault intensity between the south and north fault area of the Hongche fault belt and heterogeneity in Yanshanian movement led to the different control on oil-gas reservoirs.Because the movement in the north area was stronger than the south of the Hongche fault belt did in the late Yanshanian movement,the south area is beneficial to gas accumulation and the light oil reservoirs form in north because of the loss of gas.