天然气地球科学 ›› 2022, Vol. 33 ›› Issue (1): 3648.doi: 10.11764/j.issn.1672-1926.2021.07.004
赵星星1,2(),李斌1,2,邬光辉1,2,韩剑发3,关宝珠3,沈春光3
Xingxing ZHAO1,2(),Bin LI1,2,Guanghui WU1,2,Jianfa HAN3,Baozhu GUAN3,Chunguang SHEN3
摘要:
针对塔里木盆地塔中Ⅲ区奥陶系多相态油气藏共存的现象,通过对原油物理性质、天然气组分特征及油藏分子地球化学参数的研究发现:塔中Ⅲ区奥陶系存在凝析气藏、挥发性油藏、轻质油藏3种油气藏,原油为成熟—高成熟油,天然气为寒武系盐下古油藏裂解气与奥陶系原油溶解气的混合气。原油物理性质、天然气干燥系数、碳同位素、气油比、硫化氢含量等参数自东北至西南方向具有减小趋势。奥陶系多相态油气藏流体来源相似,轻质原油及挥发油成熟度与油藏埋深具有一定的线性关系,揭示该区存在侧向和垂向油气充注的方式。利用高精度三维地震剖面恢复了塔中Ⅲ区不同时期奥陶系油气藏的形成及其演化过程,认为底部烃源岩的热演化差异、油气的多源多期混合充注和走滑断裂的垂向疏导是造成塔中Ⅲ区多相态油气藏共存的重要原因。塔中Ⅲ区超深层勘探仍具有巨大潜力,其中塔中Ⅰ号断裂带附近及北部坳陷强气侵地区深层气藏大规模存在,中部弱气侵区深部存在挥发性油藏及气藏;西南部未气侵区深层仍可发育轻质油藏。
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