摘要
通过对火焰山中央隆起带的石油地质和地球化学特征分析,研究了该区的稠油成因机理。研究发现,本区三叠系原油均存在25-降藿烷和25,30-双降藿烷,说明这一地区的原油普遍遭受了生物降解作用。构造低部位吐玉克地区降解程度相对较弱,而英也尔地区较高。流体包裹体的特征表明,在胜金口地区,原油充注时为正常原油,而后发生抬升和生物降解作用,从而形成稠油。玉东1井包裹体显示出两次稠油和正常原油充注。在鲁8、鲁9、鲁11、鲁2、鲁10井包裹体中,由西向东,随着埋藏深度的变低,第一期和第二期原油的充注逐渐由正常原油变为完全稠油充注,表明原油在运移过程中逐渐被稠化,而且鲁10井可能是当时原油开始稠化和组分逸散的关键点。
The heavy oil genetic mechanism is studied by analysis of the petroleum geologic and geochemical characteristics in Huoyanshan central uplift belt in Tuha basin. The result shows that the existence of 25-norhopane and 25, 30-bisnorhopane in the Triassic crude oil reveals the hydrocarbons in this area generally undergo biodegradation with different degrees in different areas. In Tuyuke area in low position of the structure, it is relatively weak; in Yingye＇er area it is higher for it is in high position of it. Also, the fluid inclusion study indicates that in Shengjinkou area, normal crude oil occurs when oil charging followed by tectonic rising, biodegradation and forming heavy oil. The fluid inclusion from Yudong-1 Well appears in twice crude charges including normal oil and heavy oil. The fluid inclusions from Lu-8, Lu-9, Lu-11, Lu-2, Lu-10 wells reveal that from west to east the oil charges gradually change by migration from normal oil into complete heavy oil with the burial depth becoming shallower. Lu-10 Well could be the key point for crude oil to be thickened or oil composition to be dispersed at that time.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2010年第2期131-134,共4页
Xinjiang Petroleum Geology
关键词
吐哈盆地
原油生物降解
流体包裹体
油气运移
稠油成因
Tuha basin
crude oil
biodegradation
fluid inclusion
hydrocarbon migration
heavy oil origin
genesis
