南襄盆地泌阳凹陷核桃园组页岩油富集机制
Mechanism of shale oil accumulation in the Hetaoyuan Formation from the Biyang Depression,Nanxiang Basin
查看参考文献37篇
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文摘
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我国陆相页岩油资源潜力巨大,但当前页岩油开采量远不及预期。文章以泌阳凹陷核桃园组为例,根据颜色、结构和显微特征将研究区50块页岩划分为黑色纹层状页岩(A类)和灰色页岩(B类,包括灰色页岩、暗色泥岩及少量粉砂质泥岩)两大类,并进行了系统的地球化学测试分析,包括TOC、热解、显微组分、气相色谱和色谱-质谱分析等,以期明确湖相富有机质页岩地球化学特征及其页岩油富集机制。结果表明: A类页岩主要发育于较高盐度的强还原环境,具有较高的有机质丰度(TOC高达8.59%),富含Ⅰ型干酪根,藻类生源丰富,与此同时,较发育的水平裂缝有利于页岩油的储集,促成了现今较高的含油性(较高的热解烃含量S1和氯仿沥青“A”含量),导致A类页岩主要发育“富集”页岩油资源;而B类页岩主要发育于较低盐度的弱还原环境,有机质丰度相对较低(TOC低至1.09%),以Ⅱ_1 -Ⅱ_2型干酪根为主,藻类生源相对贫乏,与此同时,较发育的垂向裂缝加速了页岩排烃,促成了现今相对较低的含油性,导致B类页岩主要发育“低效”和“无效”页岩油资源。因此,泌阳凹陷黑色纹层状页岩能有效生成并储集丰富的页岩油资源,该认识对研究区页岩油进一步勘探开发具有重要参考价值。 |
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其他语种文摘
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The continental shale oil potential is remarkably huge in China,but the current production of shale oil is much less than expected. Therefore, in order to reveal the geochemical characteristics and shale oil accumulation mechanism of organic-rich shales,a multiple geochemical techniques,mainly including total organic carbon (TOC),Rock-Eval,organic maceral and gas chromatography mass spectrometry (GC-MS),were systematically performed on a total of 50 shale samples from shale oil field in the Biyang Depression,Nanxiang Basin, in this study. On the basis of the diversities in the color, structure and microscopic characteristics, two types of shales have been identified,which are black laminated shale (type A) and gray shale (type B, including gray shale,dark mudstone and few silty mudstones), respectively. The testing results show that (1) type A,mainly formed in high salinity and strong reducing environment, is rich in TOC (up to 8.59%) and algea organic matter (AOM) with kerogen of type Ⅰ,and contains plenty of the horizontal cracks favorable for shale oil storage which have enhanced the abundant oil content (high free hydrocarbon S_1 and chloroform bitumen “A”concentrations) at present, resulting that the enriched shale oil resources occurred in this type of shales; (2) type B,mainly developed in weak reduction environment with low salinity, has less TOC abundance (low to 1.09%) with kerogen of typeⅡand poor AOM contribution, and vertical cracks within shales have accelerated the hydrocarbon expulsion, which has led to today's poor oil content and resulted that this type of shales only contains potential and ineffective shale oil resources. Thus, the type A of shales can effectively generate and store abundant shale oil,which is of great reference value for further exploration and development of shale oil in the future. |
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来源
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石油与天然气地质
,2019,40(6):1259-1269 【核心库】
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DOI
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10.11743/ogg20190610
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关键词
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页岩油资源
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富有机质页岩
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藻类有机质
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盐度
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氧化还原环境
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泌阳凹陷
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地址
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1.
中国石油大学(华东), 中国石油深层油气重点实验室, 山东, 青岛, 266580
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中国石油大学(华东)地球科学与技术学院, 山东, 青岛, 266580
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中国科学院广州地球化学研究所, 有机地球化学国家重点实验室, 广东, 广州, 510640
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中国科学院大学, 北京, 100049
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中国石化河南油田分公司, 河南, 郑州, 450000
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0253-9985 |
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学科
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石油、天然气工业 |
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基金
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国家自然科学基金项目
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中国石油化工股份有限公司科技攻关项目
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高校自主创新科研计划项目
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文献收藏号
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CSCD:6606689
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