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准噶尔盆地中拐凸起JL30井区上乌尔禾组元素地球化学特征及其地质意义
投稿时间:2019-07-07  修订日期:2019-09-03  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020072
摘要点击次数: 73
全文下载次数: 58
作者单位E-mail
李佳思 中国科学院西北生态环境资源研究院 兰州 zkylijiasi@126.com 
余兴 中国石油新疆油田分公司勘探开发研究院  
朱涛 中国石油新疆油田分公司勘探开发研究院  
严红 中国石油共享服务西安中心薪酬核算与发放部  
张顺存 中国科学院西北生态环境资源研究院  
杨永恒 中国科学院西北生态环境资源研究院 兰州  
基金项目:国家自然科学基金“富火山岩岩屑砂砾岩储层中沸石类自生矿物的形成条件和溶蚀机理及其对储层物性的影响”(41872145)和甘肃省重点实验室专项(1309RTSA041)资助。
中文摘要:为恢复中拐凸起JL30井区上乌尔禾组碎屑岩储层沉积古环境和物源性质,探明它们对储层物性的影响,对上乌尔禾组13件细粒碎屑岩样品主微量元素及稀土元素进行了测试分析。结果显示,主微量元素丰度接近UCC平均丰度,稀土元素丰度变化大并且表现出明显的轻稀土元素富集及轻微的Eu负异常,指示物质成分来源于上地壳,且未发生大规模热液作用。剔除成岩蚀变作用影响后的Sr/Cu和∑LREE/∑HREE显示上乌尔禾组沉积期间为温暖湿润的气候,降水丰沛,Mg/Ca和Sr/Ba以及自生矿物中的氧化还原敏感元素U和Th的比值显示沉积水体属于富氧条件下的微咸水环境。古沉积环境控制了沉积相类型,影响着储层物性的优劣,受此影响,上乌尔禾组沉积环境从扇三角洲前缘水下分流河道向扇三角洲平原分流河道演变,整体表现为沉积物粒度逐渐变细的正旋回沉积,中间发育多套小旋回,形成了多套下储上盖组合,有利于油气成藏。La/Th-Hf母岩类型判别图和稀土元素特征显示母岩类型主要为长英质岩石及部分基性岩与长英质岩混合岩,古老沉积岩的贡献不大。La/Sc-Ti/Zr判别图及稀土元素参数特征显示源区构造背景为大陆岛弧,类型为切割的岩浆弧。大陆岛弧活跃的构造运动促使研究区形成了“两凸一凹”地貌形态,为沉积物提供了可容空间,是扇三角洲沉积环境形成的基础;后期火山活动的停歇是上乌尔禾组碎屑岩沉积物形成的前提。
中文关键词:准噶尔盆地  中拐凸起  JL30井区  元素地球化学  沉积环境  物源属性  储层物性
 
Characteristics of elemental geochemistry and their geological implications of the Upper Wuerhe Formation in Well Block Jinlong-30 of Zhongguai Uplift, Junggar Basin
Author NameAffiliationE-mail
LI Jiasi Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences zkylijiasi@126.com 
yuxing Institute of Exploration and Development of Xinjiang oil Company, Karamay, Xinjiang  
zhutao Institute of Exploration and Development of Xinjiang oil Company, Karamy, Xinjiang  
yanhong China National Petroleum Corporation Shared Services Center Xi''an Branch  
Zhang Shuncun Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences  
YANG Yong-heng Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences  
Abstract:In order to restore the sedimentary environment and provenance of the Upper Wuerhe Formation in Well Block Jinlong-30 in Zhongguai Uplift, and study their effects for petroleum exploration. We tested and analyzed the major, trace elements and rare earth element of 13 sedimentary rock samples from the Upper Wuerhe Formation. The results disply that the abundance of oxides of major elements are close to PAAS and UCC, while the trace elements are both less than PAAS and UCC. The total ∑REE of the study area has a scope of content and characterized by glaring enrichment of light REE, and show slight negative anomalise of Eu. Before using these element datas, we cut down some effects from diagenesis and use several parameters for every problem to ensure the accuracy of the conclusions. Eigenvalue Sr/Cu and ∑LREE/∑HREE show that the paleoclimate of the upper Wuerhe Formation is warm and moist with abundant rainfall. Eigenvalue Mg/Ca and Sr/Ba show that the ancient aquatic environment is brackish water, as well as the redox-sensitive elements U and Th in the authigenic mineral show that the oxidizing condition of the ancient water. Under this circumstance, the upper Wuerhe Formation shows a Fining-upwards sequence, grain-size gets thinner from the old to new formations, and the ancient water gets more and more deep. Deposition environment changes from subaqueous distributary channel of fan delta-front to shallow lake. This produce many fine reservoir which benefit to become large oil and gas reservoir. Base on La/Th-Hf plot and characteristic of REE, it can be concluded that provenance of studied area mainly derived from felsic-predominant rocks and some basic rock. La/Sc-Ti/Zr plot and parameters of REE show that the structural setting of the studied area is land arc related to a continent, and the sediments are magmatic arc. The active tectonic movement of the continental island arc prompted the study area to form a “two convex and one concave” landform, which provided a space for sediments and was the basis for the formation of the fan delta sedimentary environment. The late volcanic activity was stopped by the Upper Urho Formation. The premise of the formation of clastic sediments.
keywords:Junggar Basin  Zhongguai Uplift  Well Block Jinlong-30  Elemental geochemistry  sedimentary environment  Source attribute  Reservoir physical property
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