| 辽东湾辽西凹陷沙河街组烃源岩评价及油源研究 |
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| 引用本文： | 梁建设,张功成,苗顺德,李友川,陈桂华. 辽东湾辽西凹陷沙河街组烃源岩评价及油源研究[J]. 沉积学报, 2012, 30(4): 739-746 |
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| 作者姓名： | 梁建设 张功成 苗顺德 李友川 陈桂华 |
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| 作者单位： | 1.中海油研究总院,北京,100024;2.中海油研究总院,北京,100024;3.中海油研究总院,北京,100024;4.中海油研究总院,北京,100024;5.中海油研究总院,北京,100024 |
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| 基金项目： | 国家科技重大专项项目23“近海大中型油气田形成条件及勘探技术”(编号:2008ZX05023)课题1“近海富烃凹陷资源潜力再评价和新区、新领域勘探方向” |
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| 摘 要： | 辽西凹陷沙河街组是否发育烃源岩,是该凹陷油气勘探首要问题。以源控论为基本指导思想,从沉积相研究入手,通过烃源岩地球化学分析、盆地模拟及油源对比,综合评价了辽西凹陷沙河街组烃源岩。在大量地震资料及单井资料分析基础上,认为辽西凹陷沙河街组发育大规模中深湖相,特别是辽西中洼沙四段发育中深湖相沉积,具备形成烃源岩的先决条件。通过在该凹陷取的33个油样及48个岩样分析,认为沙河街组烃源岩有机显微组分组成中腐泥组和壳质组含量普遍较高,富含浮游藻类,干酪根类型为Ⅰ～Ⅱ型。盆地模拟认为辽西凹陷生烃门限约2 500 m,沙三段进入生烃门限,具备大规模生烃条件,沙一段未进入生烃门限。通过油源对比分析,辽西凹陷原油
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| 关 键 词： | 烃源岩 地球化学分析 油源对比 沙河街组 辽西凹陷 |
Evaluation of Shahejie Source Rock and Oil Source Research in the Liaoxi Depression,Liaodong Bay,China |
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| LIANG Jian-she,ZHANG Gong-cheng,MIAO Shun-de,LI You-chuan,CHEN Gui-hua. Evaluation of Shahejie Source Rock and Oil Source Research in the Liaoxi Depression,Liaodong Bay,China[J]. Acta Sedimentologica Sinica, 2012, 30(4): 739-746 |
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| Authors: | LIANG Jian-she ZHANG Gong-cheng MIAO Shun-de LI You-chuan CHEN Gui-hua |
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| Affiliation: | (China Offshore Oil Research Institute,Beijing 100024) |
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| Abstract: | The main reason for bad potential evaluation of Liaoxi depression is that hydrocarbon generation of Es3 and Es4 cannot be recognized,which is the principal issue of hydrocarbon exploration in Liaoxi depression.Based on source control theory and sedimentary faces study,analyzed geochemistry characteristics,through basin modeling and oil source research,we evaluated Shahejie Fm.source rock comprehensively.Based on a great quantity of seismic and well material,we identified fan delta faces-coastal shallow-lake faces-middle-deep lake faces of Shahejie Fm.in Liaoxi depression,especially middle deep lake face of Es4.Source supply is sufficient in lower segment of Es3 and the size of middle-deep lake is very small,its area of southern sag is largest,smaller in middle sag and least in northern sag.Source supply becomes smaller in middle segment of Es3 and the size of middle-deep lake is very big that mainly locates in middle sag.The area of southern sag is larger and smaller in northern sag.Mud.stone of middle-deep lake face is the precondition of forming source rock.Through 33 oil samples and 48 rock samples analysis of Liaoxi depression,we concluded that content of sapropelic and exinite of organic material is commonly higher and rich of planktonic algae in Shahejie Fm.source rock.Its kerogen type is Ⅰ-Ⅱ.Basin modeling concluded that hydrocarbon generating threshold is 2 500 m,Es3 source rock below this depth and Es1 source rock is upper this depth.After oil-source correlation research,we considered that oil geochemistry characteristics are similar with source rock geochemistry of Es3 and Es4 in Liaoxi depression.Hence,Es3 and Es4 source rock is the most important oil source in Liaoxi depression.With organic faces and sedimentary faces researching,organic material of Es source rock is entirely rich.But there are some differences of these sags in Liaoxi depression.Geochemical indexes of northern sag of Liaoxi depression are higher,subordinate of middle sag,lower of southern sag.From distributions of middle-deep lake face,the author identified small scale of middle-deep lake face of Es3 is developed in northern sag of Liaoxi depression,large scale of middle-deep lake face of Es3 and Es4 are developed in middle sag of Liaoxi depression,and large scale of middle-deep lake face of Es3 is developed in southern sag of Liaoxi depression.Middle sag of Liaoxi depression has a large potentiality of hydrocarbon generation,smaller in southern sag and least in northern sag based on comprehensive analysis. |
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| Keywords: | source rock geochemistry oil-source correlation Shahejie Formation Liaoxi depression |
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