天然气地球科学 ›› 2020, Vol. 31 ›› Issue (7): 962969.doi: 10.11764/j.issn.1672-1926.2020.03.012
Chao-wei LIU(),Xu-guang GUO,Ze-sheng WANG,Ling-li ZHU,Rong ZHANG,Hong CHEN
摘要:
准噶尔盆地阜东斜坡侏罗系头屯河组油气同产。在前人研究的基础上,利用原油碳同位素、姥植比以及生物标志物资料,对阜东斜坡侏罗系头屯河组原油成因进行分析;并结合储层流体包裹体特征,探讨了其油气成藏期次。研究表明:阜东斜坡侏罗系头屯河组原油碳同位素值介于 -27.59‰~-29.97‰之间,姥植比较大,呈现出混源的特征;原油饱和烃色谱完整但质谱图上可见完整的25?降藿烷系列,说明阜东斜坡侏罗系头屯河组原油至少存在2期油气充注。储层中存在2期油气包裹体:一期赋存于石英颗粒微裂隙中,发黄绿色和黄色荧光;另一期赋存于切穿石英颗粒的微裂隙中,发蓝色荧光;结合埋藏—地热史分析认为,阜东斜坡侏罗系头屯河组存在2期油气充注,第一期油气来自二叠系腐泥型源岩,并在晚白垩世遭到破坏,第二期油气为侏罗系腐殖型源岩和二叠系腐泥型源岩产物的混合。研究区侏罗系头屯河组为充注—局部破坏—二次充注的成藏过程。
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