准噶尔盆地南缘中段侏罗系烃源岩热演化史及其对天然气成藏的影响  

Thermal evolution and natural gas accumulation of Jurassic source rocks in middle of southern margin of Junggar Basin

作　　者：韩杨 蒋文龙[1] 杨海波[1] 任海姣 王霞田[1] 王韬[1] HAN Yang;JIANG Wenlong;YANG Haibo;REN Haijiao;WANG Xiatian;WANG Tao(Research Institute of Exploration and Development,PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang,834000,China)

机构地区：[1]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000

出　　处：《油气地质与采收率》2022年第5期49-57,共9页Petroleum Geology and Recovery Efficiency

基　　金：中国石油“十四五”前瞻性基础性重大科技项目“准噶尔盆地凹陷区下组合轻质油与天然气成藏规律研究”(2021DJ0206)。

摘　　要：准噶尔盆地南缘深部资源是近年来天然气勘探的热点,其中位于南缘中段霍玛吐背斜带的侏罗系烃源岩资源潜力巨大,但由于研究区勘探程度较低,烃源岩热演化史与成藏条件的匹配关系尚不清晰。基于实测地震解释、热史温标数据,应用盆地模拟方法对南缘中段中—下侏罗统烃源岩热演化史进行恢复,并结合烃源岩地球化学特征分析,对天然气生成、运聚以及与构造演化的耦合关系进行系统研究。结果表明:南缘中段发育中—下侏罗统主力烃源岩,其关键生气时期为早白垩世早期(距今99.6 Ma)和晚白垩世末期(距今65.5 Ma),现今中—下侏罗统烃源岩处于高成熟—过成熟阶段,尚具一定生烃潜力;该区具有晚期抬升型次生气藏和持续埋深型高成熟气藏2种天然气成藏模式,天然气分布受烃源岩和构造双重控制。In recent years,deep resources in the southern margin of Junggar Basin have been a hot spot for natural gas ex⁃ploration.Among them,in the middle of the southern margin,the Jurassic source rocks in Huomatu anticline zone have huge potential resources.However,due to the low degree of exploration,the relationship between the thermal evolution of source rocks and the gas accumulation conditions is still unclear.Based on the seismic interpretation and thermal history data,a basin simulation system was applied to restore the thermal evolution histories of Middle and Lower Jurassic source rocks in the southern margin of Junggar Basin.Furthermore,combined with the geochemical characteristics of Jurassic source rocks,the generation and accumulation of gas and the coupling relationships with structural evolution were systemat⁃ically studied.The research showed that the Middle and Lower Jurassic source rocks developed in the middle of the south⁃ern margin.Moreover,the gas mainly generated in the early stage of the Early Cretaceous Epoch(99.6 Ma)and the late stage of the Late Cretaceous Epoch(65.5 Ma),respectively.Now,the Middle and Lower Jurassic source rocks are in the stage of high and over maturity and still have hydrocarbon generation potential.At the same time,two hydrocarbon accumu⁃lation models have been formed in the area,and they are secondary accumulation with late uplift and high-mature accumu⁃lation with continuous buried depth.In addition,the gas distribution has been controlled by the evolution of the source rocks and the structure.

关 键 词：热演化史 烃源岩 中—下侏罗统 成藏模式 准噶尔盆地南缘 

分 类 号：TE121.1[石油与天然气工程—油气勘探]