柴北缘西段侏罗系沉积特征

发布时间：2018-01-13 11:04

本文关键词：柴北缘西段侏罗系沉积特征　出处：《古地理学报》2017年04期 　论文类型：期刊论文

【摘要】：柴达木盆地北缘中小盆地(包括苏干湖盆地)是中国西部潜在的油气资源战略接替区,前期工作揭示了在柴北缘西段发育具有一定生油潜力的中生界烃源岩。沉积特征和沉积环境分析对于研究烃源岩及储集层分布具有重要意义。但有关柴北缘西段沉积特征和沉积环境的认识相对较少,制约了油气勘探工作的进一步开展。通过野外露头观测、钻测井资料分析以及地球化学测试等技术手段,初步落实了柴北缘西段侏罗系的沉积体系和沉积环境,为今后的油气勘探提供了依据。研究表明,苏干湖盆地早中侏罗世发育扇三角洲—湖泊沉积,晚侏罗世发育辫状河,物源可能主要来自北部祁连山;赛什腾山南缘侏罗纪发育沼泽—三角洲—湖泊沉积体系,富含煤层,物源来自西北和东北;冷湖一带早侏罗世主要发育湖西山组深湖—半深湖沉积,物源可能来自西北部阿尔金山附近。泥岩样品沉积地化分析显示研究区整体为还原环境,不同采样点样品的稀土元素配分模式具有相似性。构造-沉积演化分析表明,早侏罗世柴达木盆地北缘西段初始断陷,湖盆沉积中心位于冷湖一带;中侏罗世中期(对应于大煤沟组四段)苏干湖盆地内部裂陷成盆,沉积中心向东转移,后期(对应于七段)湖泛形成大湖盆。侏罗系烃源岩主要发育于大煤沟组五段至七段湖平面上升时期。
[Abstract]:The northern margin of the Qaidam Basin and basin (including suganhu basin) is a strategic Chinese the potential oil and gas resources to replace the area, preliminary work reveals has certain hydrocarbon potential Mesozoic hydrocarbon source rocks in the northern Qaidam Basin. The sedimentary characteristics and sedimentary environment analysis has an important significance for the study of hydrocarbon source rocks and reservoir distribution. But understanding the western part of the northern Qaidam basin sedimentary characteristics and sedimentary environment of relatively small, further restricted the oil and gas exploration work. Through the outcrop observation, drilling and well logging data analysis and geochemical testing technology, we make a preliminary study of the sedimentary system and sedimentary environment of Jurassic in the Northern Qaidam Basin, provide the basis for the future oil and gas exploration. Research shows that the fan delta lake depositional early Middle Jurassic suganhu basin, late Jurassic braided river, the source may be mainly from the North Qilian Mountains SERTENGSHAN; of the Jurassic swamp delta lacustrine depositional system, rich in coal, provenance from the northwest and Northeast Cold Lake area; Early Jurassic lake Xishan group mainly developed deep and semi deep lacustrine sedimentary provenance may come from the northwest near the Altyn Mountains. The mudstone samples of sedimentary geochemical analysis and overall study area display for reducing environment of rare earth elements in different sampling points of the sample distribution patterns are similar. The tectonic and sedimentary evolution analysis showed that the early Jurassic in the west of northern Qaidam Basin initial rift lacustrine sedimentary center is located in the Cold Lake area; in the Middle Jurassic (corresponding to the large coal group four) suganhu basin rift into the basin, the sedimentary center to the East, the late (corresponding to seven) lake formed the Great Lakes basin. The Jurassic source rocks mainly in the development of large coal group of five to seven paragraphs lake level rise period.

【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)地球科学学院;中国地质科学院地质力学研究所;
【基金】：中国地质调查局地质调查项目(编号:12120115003501) 国家自然科学基金青年科学基金(编号:41202107) 教育部高等学校博士学科点专项科研基金(新教师类)(编号:20120007120004) 中国石油大学(北京)科研基金(编号:KYJJ2012-01-20)联合资助~~
【分类号】：P618.13
【正文快照】： 3中国地质科学院地质力学研究所,北京100081Sedimentary characteristics of the Jurassicin western north margin of Qaidam BasinLiu Xin1,2Zhu Shifa1,2Du Jianjun3Liu Chenglin2,3Qin Yi1,2Zhang Jiatang1,21 State Key Laboratory of Petroleum Resources and Prospecti

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