论文部分内容阅读
位于准噶尔盆地西北缘车排子地区的车89井在新近系沙湾组地层中获得高产工业油流,为准噶尔盆地南缘前陆斜坡带新近系勘探开辟了新的领域.车排子地区与四棵树和沙湾二个生烃凹陷毗邻,存在石炭系、二叠系、三叠系、侏罗系和古近系等多套烃源岩,具有形成混源原油的地质和地球化学条件.车89井新近系样品原油碳同位素、族组成及生物标志化合物组成特征等地球化学分析表明,新近系沙湾组原油与单纯的二叠系、侏罗系烃源岩既有某种程度的类似,又都存在一定的差异,没有明确的油源关系,为二者的混源产物.地球化学分析及地质研究表明,古近系乌伦古河组砂岩抽提物与新近系沙湾组原油和砂岩抽提物为同源但不是同期充注,乌伦古河组中的油气在新近系地层沉积前已完成充注,并遭受较为严重的生物降解和氧化水洗作用,从另一方面证明车89井新近系沙湾组原油不可能来自古近系烃源岩.
Well 89 in the Chepaizi area in the northwestern margin of the Junggar Basin obtained high-yield industrial oil flow in the Neogene Shawan Formation, opening up new areas for exploration of the foreland slope in the southern margin of the Junggar Basin. There are two sets of hydrocarbon source rocks, such as Carboniferous, Permian, Triassic, Jurassic and Paleogene, which have the geological and geochemical conditions for forming mixed source crude oil. The geochemical analyzes of the carbon isotopes, ethnic composition and biomarker composition of the Neogene samples of Well No.89 show that the Neogene Shawan Formation crude oil is similar to the simple Permian and Jurassic source rocks to some extent , There are some differences, there is no clear relationship between oil source, the two mixed source products.Geochemical analysis and geological studies show that the Paleogene Wulungu River sandstone extract and the Neogene Shawan Formation crude oil and The sandstone extracts are of the same source but not of the same period. The oil and gas in the Wulunguhe Formation has been filled before the sediments of the Neogene strata and suffered severe biodegradation and oxidative water washing. On the other hand, Well new system Bay oil can not come from the group PALEOGENE source rocks.