天然气地球科学 ›› 2021, Vol. 32 ›› Issue (7): 10471060.doi: 10.11764/j.issn.1672-1926.2021.03.012
马安来1(),何治亮2,云露3(),吴鲜3,李慧莉1,邱楠生4,常健4,林会喜1,曹自成3,朱秀香3,尤东华1
An-lai MA1(),Zhi-liang HE2,Lu YUN3(),Xian WU3,Hui-li LI1,Nan-sheng QIU4,Jian CHANG4,Hui-xi LIN1,Zi-cheng CAO3,Xiu-xiang ZHU3,Dong-hua YOU1
摘要:
塔里木盆地顺托果勒地区奥陶系超深层油气藏相态分布复杂, 轻质油藏、挥发油藏、凝析油气藏和干气藏并存。根据天然气组分、组分碳氢同位素以及天然气轻烃等分析数据,研究了顺北地区奥陶系超深层天然气的地球化学特征及成因, 并与顺托、顺南、古隆、古城地区奥陶系天然气成因进行了对比。顺北地区奥陶系超深层天然气干燥系数低, 绝大多数天然气干燥系数分布范围在0.52~0.88之间, 天然气为湿气。天然气普遍含有微量的H2S, 天然气甲烷碳同位素值偏低,分布范围为-49.6‰~-44.7‰, 乙烷碳同位素值分布范围为-39.3‰~-32.5‰。天然气碳、氢同位素均具有正序系列。天然气轻烃甲基环己烷指数小于35%, C5-C7轻烃组成以正构烷烃和异构烷烃为主。顺托果勒地区奥陶系天然气均为油型气, 顺北地区奥陶系天然气以干酪根裂解气为主, 混有原油裂解早期阶段形成的湿气; 而顺托、顺南、古隆、古城地区奥陶系天然气为原油裂解气。2种不同成因的裂解气具有相同的气源岩——寒武系, 不同类型天然气的分布与不同地区奥陶系经历的最高古地温和(或)现今地温密不可分, 顺北地区奥陶系T74界面经历的最高古地温、现今地温分布范围分别在170~180 ℃、150~160 ℃之间, 低于顺托和顺南地区奥陶系T74界面经历的最高古地温和现今地温, 未达到原油大量裂解温度, 因而顺北地区奥陶系保存有轻质油藏和挥发油藏, 天然气以干酪根裂解气为主,而由顺托、顺南、古隆、古城地区,现今地温和(或)古地温高, 导致原油大规模裂解, 使得奥陶系油气藏由凝析油气藏至干气藏变化,天然气为原油裂解气。
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