塔里木盆地玉北地区埋藏史及热史分析

发布时间：2018-03-24 00:11

本文选题：玉北地区　切入点：烃源岩　出处：《现代地质》2017年02期

【摘要】：根据地层分层数据和古热流分析,对塔里木盆地玉北地区的5口代表性钻井进行了埋藏史、热史的模拟与分析,探讨了研究区烃源岩的热演化成熟过程,初步划分了烃源岩的成熟阶段和生烃期次。研究结果认为:玉北地区寒武系-泥盆系沉积时期,具有多次沉积埋藏和隆升剥蚀的交替;泥盆系沉积之后,石炭-二叠系呈现沉积埋藏的特征;中生代在玉北地区东部少量沉积三叠系,随后被剥蚀,而在中西部发生沉积间断;进入新生代,地层持续沉积,且沉积速率呈现增大趋势。研究区寒武系烃源岩自沉积以来成熟度演化相对连续,奥陶纪时进入生烃门限,成熟时期较早;志留-泥盆纪,受海西早期运动的影响,发生隆升剥蚀作用,烃源岩演化变缓;石炭-二叠纪受控于区域上持续稳定的地层沉积与广泛发育的火山活动,研究区寒武系烃源岩进入中高成熟阶段;由于喜马拉雅造山运动的远程效应,新生代研究区持续沉降,形成巨厚沉积,烃源岩成熟度达到高-过成熟,为天然气生成阶段。
[Abstract]:Based on stratigraphic stratification data and paleo-heat flow analysis, the burial history and thermal history of five representative drilling wells in Yubei area of Tarim Basin are simulated and analyzed, and the thermal evolution and maturation process of source rocks in the study area are discussed. The maturation and hydrocarbon generation stages of the source rocks are preliminarily divided. The results show that the Cambrian-Devonian sedimentary periods in the north of Yubei area are alternately buried and uplifted and denuded after the Devonian deposits. Carboniferous-Permian shows sedimentary burial characteristics; Mesozoic in the eastern part of Yubei area, a small amount of sedimentary Triassic, then denudated, and then occurred in the central and western sedimentary discontinuity; into the Cenozoic, the strata continue to deposit, The sedimentary rate of Cambrian source rocks in the study area has been relatively continuous since deposition, and entered the threshold of hydrocarbon generation in Ordovician and matured earlier, and Silurian Devonian was affected by the early Hercynian movement. Carboniferous-Permian is controlled by the continuous and stable stratigraphic deposits and extensive volcanic activities in the study area, and the Cambrian source rocks in the study area have entered the middle and high maturity stage. Due to the remote effect of Himalayan orogenic movement, the Cenozoic study area continued to settle, forming a very thick deposit, and the maturity of the source rocks reached high to over-mature, which was the stage of natural gas generation.
【作者单位】：中国石油大学(北京)油气资源与探测国家重点实验室;中国石油大学(北京)盆地与油藏研究中心;临沂大学地质与古生物研究所;中国石化西北油田分公司;
【基金】：国家自然科学基金项目(41572105,41172125) 国家重点基础研究发展计划项目(2012CB214804) 国家科技重大专项(2011ZX05002-003-001) 中国石油化工股份有限公司项目(P14131,P11086)
【分类号】：P618.13

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