| 塔里木盆地玉尓吐斯组高频层序沉积充填演化特征及控烃作用 |
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| 引用本文： | 江维,高志前,胡宗全,赵永强,储呈林.塔里木盆地玉尓吐斯组高频层序沉积充填演化特征及控烃作用[J].现代地质,2021,35(2):349-364. |
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| 作者姓名： | 江维 高志前 胡宗全 赵永强 储呈林 |
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| 作者单位： | 1.中国地质大学(北京) 能源学院,北京 1000832.中国地质大学 海相储层演化与油气富集机理教育部重点实验室,北京 1000833.中国石油化工股份有限公司石油勘探开发研究院,北京 1000834.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 |
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| 基金项目： | 国家自然科学基金项目(41972130);中国石化科技攻关项目(33550007-19-ZC0613-0077);中科院先导项目(XDA14010201-02)。 |
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| 摘 要： | 结合9个野外剖面和17口井,对塔里木盆地玉尔吐斯组沉积演化及其对烃源岩的制约作用进行了系统研究和分析。在精细对比后发现,塔里木盆地下寒武统玉尔吐斯组可分为2个三级层序(SQ1、SQ2)、5个四级层序(sq1—sq5),其中三级层序SQ1可分为3个四级层序,SQ2可分为2个四级层序。SQ1发生在寒武纪初期,海进速度较慢,影响范围相对局限,而SQ2的海进则相对迅速,影响范围较大。四级层序sq1发生在第一次海侵初期,水体浅,主要沉积紫红色白云岩、灰黑色砂屑白云岩,起填平补齐的作用;sq2、sq4发生在海侵—海退的转换时期,是两套深水的沉积,岩性以黑色泥岩、硅质泥岩和硅质岩为主,局部发育泥岩与条带状白云岩互层;sq3、sq5是海退过程中的浅水沉积,主要发育灰色白云岩和藻白云岩,局部有泥质夹层。利用Mn、Fe、Ti、Rb、K、Sr、Ba、Cu、U、V、Mo等元素及其比值进行沉积环境分析表明,sq2时期,水体深度大、盐度低、气候温暖湿润,有利于生物发育,并且其硫化缺氧的环境极其有利于有机质的保存;sq4时期,水体深度较大,盐度相对较小,气候相对温暖湿润,较为适合生物生存,并且其硫化缺氧夹次氧化的环境,较为适合有机质保存。高频海平面变化与沉积环境演化影响着玉尔吐斯组的烃源岩分布与品质,sq2时沉积的烃源岩品质优于sq4,但是其分布范围小于sq4。
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| 关 键 词： | 烃源岩 高频层序 硫化缺氧 沉积演化 |
| 收稿时间： | 2020-10-08 |
| 修稿时间： | 2020-12-16 |
Sedimentary Filling Evolution and Hydrocarbon Control of High Frequency Sequence in Yurtus Formation,Tarim Basin |
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| JIANG Wei,GAO Zhiqian,HU Zongquan,ZHAO Yongqiang,CHU Chenglin.Sedimentary Filling Evolution and Hydrocarbon Control of High Frequency Sequence in Yurtus Formation,Tarim Basin[J].Geoscience——Journal of Graduate School,China University of Geosciences,2021,35(2):349-364. |
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| Authors: | JIANG Wei GAO Zhiqian HU Zongquan ZHAO Yongqiang CHU Chenglin |
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| Institution: | 1. School of Energy, China University of Geosciences, Beijing 100083, China2. Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education,China University of Geosciences, Beijing 100083, China3. Research Institute of Petroleum Exploration and Development, SINOPEC, Beijing 100083, China4. Wuxi Institute of Petroleum Geology, Research Institute of Petroleum Exploration and Development, SINOPEC, Wuxi, Jiangsu 214151, China |
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| Abstract: | The Lower Cambrian Yurtus Formation in Tarim Basin is one of the best marine source rocks found in China.In order to understand the evolution of the sedimentary facies of the Yurtus Formation and its restriction on source rocks,this paper has systematically studied and analyzed the sedimentary evolution of the Yurtus Formation and its restriction on source rocks by combining 9 field profiles and 17 wells.After fine correlation,it is found that Yurtus Formation can be divided into two third-order sequences and five fourth-order sequences,among which the first third-order sequence can be divided into three fourth-order sequences and the second third-order sequence can be divided into two fourth-order sequences.The first third-order sequence occurred in the Early Cambrian,the transgression speed was slow and the influence range was relatively limited,while the transgression of the second third-order sequence was relatively rapid and had a large influence range.The fourth-order sequence sq1 developed in the early stage of the first transgression,with shallow water body,mainly deposited with purple-red dolomite and gray-black sand-clastic dolomite,which mainly played the role of filling and filling;sq2 and sq4 developed during the transition period of transgression and regression,and were two sets of deep-water deposits.The deposits are mainly dark mudstone,siliceous mudstone and siliceous rock,and interbedded mudstone and banded dolomite are developed locally;sq3 and sq5 are shallow water deposits in the process of regression,mainly gray dolomite and algal dolomite,with argillaceous interlayers in some parts.Analysis of deposition environment using Mn,Fe,Ti,Rb,K,Sr,Ba,Cu,U,V,Mo and other elements and their ratios shows that in the period of sq2,the water body is deep,low salinity and warm and humid climate,which is conducive to the development of organisms,and its sulfurized and anoxic environment is extremely conducive to the preservation of organic matter;In the period of sq4,the depth of water body is larger,the salinity is relatively small,and the climate is also relatively warm and humid,so it is also suitable for biological survival.Moreover,it is suitable for the preservation of organic matter in the environment of sulfidation,anoxia and secondary oxidation.High-frequency sea level changes and the evolution of the depositional environment affect the source rock distribution and quality of the Yurtus Formation.The quality of the source rocks deposited at sq2 is better than that of sq4,but its distribution area is less than that of sq4. |
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| Keywords: | hydrocarbon source rocks high frequency sequence sulfide anoxia sedimentary evolution |
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