塔里木盆地草湖凹陷热演化与生烃史——基于IES软件盆地模拟技术

THERMAL EVOLUTION AND HYDROCARBON GENERATION IN THE CAOHU SAG OF THE TARIM BASIN-BASED ON IES BASIN SIMULATION TECHNOLOGY

王斌 赵永强 罗宇 马红强

Wang Bin Zhao Yongqiang Luo Yu Ma Hongqiang

中国石油化工股份有限公司, 石油勘探开发研究院, 无锡石油地质研究所, 江苏, 无锡, 214151

Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China

利用IES-PetroMod盆地模拟软件,在塔里木盆地草湖凹陷单井埋藏史模拟的基础上,进行热史和生烃史模拟与分析。研究表明:1)凹陷区寒武—奥陶系烃源岩在奥陶纪中期Ro就达到0.5%,开始成熟生烃,生烃高峰期为加里东中期—海西早期;寒武系烃源岩在海西早期就已进入过成熟阶段;奥陶系烃源岩在海西早期进入高成熟生气阶段,海西晚期达到过成熟。2)东西缘斜坡区寒武系烃源岩生油高峰期为加里东中期—海西晚期;奥陶系烃源岩生油高峰期为海西期—印支期。3)库尔勒鼻凸寒武—奥陶系烃源岩在海西早期已达成熟—高成熟阶段;在海西晚期大幅抬升,停止生烃,早期生成的油气被破坏;燕山晚期—喜山期持续沉降,但埋深有限,几乎无二次生烃的可能。

On the basis of single well burial history simulation in the Caohu Sag of the Tarim Basin, studies of thermal evolution and hydrocarbon generation histories have been carried out with the IES-PetroMod basin modeling software. Several conclusions were made. a) In the sag, Ro of the Cambrian and the Ordovician source rocks had reached 0.5% during the middle Ordovician and had begun to generate hydrocarbon. The peak stage of hydrocarbon generation was from the middle Caledonian to the early Hercynian. The Cambrian source rocks had entered the over mature stage during the early Hercynian. The Ordovician source rocks had entered the highly mature gas generation stage in the early Hercynian and had reached the over mature stage in the late Hercynian. b) In the east and the west edge of the sag, the Cambrian source rocks reached the oil generation peak in the middle Caledonian and the late Hercynian. The Ordovician source rocks reached the oil generation peak in the Hercynian and the Indosinian. c) In the Kuerle uplift, the Cambrian and the Ordovician source rocks had entered the mature and the highly mature stages in the early Hercynian. During the late Hercynian, hydrocarbon generation stopped and the early hydrocarbon was destroyed. From the late Hercynian to the Himalayan, the Kuerle structural nose continued subsiding, but the burial depth was limited and there was nearly no probability for secondary hydrocarbon generation.

中国石油化工股份有限公司科技部项目(P08062)资助

https://doi.org/10.11781/sysydz201006605