| 鄂尔多斯盆地东北部石盒子组层序充填样式及过程分析 |
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| 引用本文： | 陈安清 陈洪德 林良彪 王,峻 徐胜林.鄂尔多斯盆地东北部石盒子组层序充填样式及过程分析[J].中国地质,2009,36(5):1046-1054. |
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| 作者姓名： | 陈安清 陈洪德 林良彪 王 峻 徐胜林 |
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| 作者单位： | "油气藏地质及开发工程"国家重点实验室(成都理工大学),沉积地质研究院,四川,成都,610059 |
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| 基金项目： | 国家自然科学基金重点项目，国家重大科技专项 |
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| 摘 要： | 本文根据野外露头、测井及钻井岩心等资料,研究了鄂尔多斯盆地东北部石盒子组的层序充填样式和演化规律.于陆内坳陷盆地发展阶段的高潮期以充填辫状河三角洲为特征,相对稳定期以充填曲流河三角洲为特征;陆内坳陷盆地的成熟阶段以充填网结河三角洲为特征.各时期的三角洲具有"大平原、小前缘"的特点,这为河道的形成演化和砂体富集提供了空间.提出研究区内最有利储集相带为辫状河三角洲的分流河道(A1型)、水下分流河道(A2型);曲流河三角洲的分流河道(A2型)、水下分流河道(A2型)和网结河三角洲分流河道的结点(C1型)亦是较有利储集体.总之,基准面的旋回控制的古地理面貌和层序充填规律对鄂尔多斯盆地岩性油气藏的形成具有重要意义.
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| 关 键 词： | 石盒子组 基准面旋回 层序充填 三角洲 鄂尔多斯盆地 |
An analysis of sequence filling types and process of Shihezi Formation in northeast Ordos Basin |
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| CHEN An-qing,CHEN Hong-de,LIN Liang-biao,WANG Jun,XU Sheng-lin.An analysis of sequence filling types and process of Shihezi Formation in northeast Ordos Basin[J].Chinese Geology,2009,36(5):1046-1054. |
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| Authors: | CHEN An-qing CHEN Hong-de LIN Liang-biao WANG Jun XU Sheng-lin |
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| Institution: | State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation (Chengdu University of Technology), Institute of Sedimentary Geology, Chengdu 610059, Sichuan, China |
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| Abstract: | Based on data from field outcrops,well logs and drilling cores,this paper studied the sequence filling types and evolution of Shihezi Formation in northeast Ordos Basin.In the early development stage of the continental depression basin,the braided river delta and the meandering river delta were successively filled,and in the mature stage of the continental depression basin,the anastomosed river delta was filled.These deltas,characterized by "big plain,small front",offered space for river evolution and sand enrichment.Distributary channels(A1 type),submerged distributary channels(A2 type) microfacies of the braided river delta are considered to be the most favorable facies belts for the formation of reservoirs.Distributary channel(A2 type) and submerged distributary channel(A2 type) microfacies of the meandering river delta,and nodes of distributary channels(C1 type)of the anastomosed river delta can also become favorable reservoirs.In conclusion,the palaeophysiography and sequence filling controlled by base-level cycles must have had played an important role in forming lithologic reservoirs in Ordos Basin. |
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| Keywords: | Shihezi Formation base-level cycle sequence filling delta Ordos Basin |
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