| 四川盆地东北部长兴组层序地层与储层分布 |
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| 引用本文： | 马永生,牟传龙,郭彤楼,谭钦银,余谦.四川盆地东北部长兴组层序地层与储层分布[J].地学前缘,2005,12(3):179-185. |
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| 作者姓名： | 马永生 牟传龙 郭彤楼 谭钦银 余谦 |
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| 作者单位： | 1. 中国石化,南方勘探开发分公司,云南,昆明,650200
2. 成都地质矿产研究所,四川,成都,610082 |
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| 摘 要： | 四川盆地东北部的二叠系长兴组为一套碳酸盐岩地层。宣汉盘龙洞剖面详尽研究表明,长兴组可分为两个三级层序:第1层序的海侵体系域由开阔台地滩间相沉积组成,高位体系域为台地边缘礁滩相沉积;第2层序的海侵体系域为浅滩沉积,高位体系域为暴露浅滩相-蒸发潮坪相沉积。长兴组中层序界面主要有水下间断不整合面和暴露侵蚀不整合面两类,相当于PeterVail的II类层序界面。在层序地层研究的基础上,对长兴组储层的时空分布特点进行了系统研究。研究发现,储层与层序地层关系密切,储层主要发育在层序的高水位体系域中:礁滩相储层位于第1层序的高位体系域中,而暴露浅滩-蒸发潮坪储层则主要产在第2层序的高水位体系域中。长兴组层序地层格架图以及层序高水位体系域沉积相平面图的编制,成为预测储层二维空间分布的基础。结果表明,礁滩相储层分布于通江—开县碳酸盐台地的东西两侧,暴露浅滩-蒸发潮坪储层遍布于通江—开县的碳酸盐台地及其东西两侧地区之中。两个层序高位体系域中的储层岩石孔隙丰富,储集条件较好,分布面积较广,从而成为研究区域油气勘探的重要目的层。
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| 关 键 词： | 层序地层 长兴组 礁滩储层 川东北地区 |
| 文章编号： | 1005-2321（2005）03-0179-07 |
| 收稿时间： | 2005-07-10 |
| 修稿时间： | 2005-07-20 |
Sequence stratigraphy and reservoir distribution of the Changxing Formation in northeastern Sichuan Basin |
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| MA Yong-sheng,MU Chuan-long,GUO Tong-lou,TAN Qin-yin,YU Qian.Sequence stratigraphy and reservoir distribution of the Changxing Formation in northeastern Sichuan Basin[J].Earth Science Frontiers,2005,12(3):179-185. |
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| Authors: | MA Yong-sheng MU Chuan-long GUO Tong-lou TAN Qin-yin YU Qian |
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| Institution: | 1. Southern Exploration and Development Division Company of SINOPEC, Kunming 650200, China;2. Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, China |
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| Abstract: | The Permian Changxing Formation in northeastern Sichuan Province is characterised by a succession of carbonate rocks. A detailed subdivision of the third-order sequence in the Panlongdong section of Xuanhan County indicates that the Changxing Fm. can be divided into two third-order sequences. For the first third-order sequence, the transgressive system tract (TST) of the first sequence is made up of inter-bank deposits within open platform, and its highstand system tract (HST) comprises a set of reef-bank deposits belonging to platform-margin facies. The TST of the second sequence is characterized by a set of shallow-bank deposits, and its HST is mainly of a set of deposits belonging to both evaporite-flat facies and exposed shallow-bank facies. The sequence boundaries of the Changxing formation include an undersea gap unconformity boundary, and exposed-eroded unconformity boundary, corresponding to the type 2 sequence boundary of Peter Vail. Based on the study of sequence stratigraphy, the temporal and spatial distribution of reservoir in the Changxing formation can be inferred. The study demonstrates that there is a close relationship between reservoir distribution and sequence-strataigraphic division, with reservoirs mainly located in the HST of a sequence. The reservoir of the reef-bank type is mainly located in the HST unit of the first third-order sequence, and that of evaporite-flat facies and exposed shallow-bank facies is mainly developed in the HST unit of the second third-order sequence. Thus, a framework plot of sequence stratigraphy and a sedimentary facies ichnograph of third-order sequences-HST for the Changxing formation can form the basis to estimate the distribution of reservoirs in the two-dimensional space. The result shows that organic reef-bank reservoirs are located along the eastern and western margins of the Tongjiang-Kaixian carbonate platform, extending in a northwest-southeast direction. Similarly, the exposed-bank and evaporite-flat reservoirs are distributed along the Tongjiang-Kaixian carbonate platform and on its eastern and western sides, extending over a vast area. The reservoirs developed in the HST units of these two third-order sequences are characterized by abundant pore space, excellent reservoir quality and a widespread distribution. Therefore, these reservoirs are important target beds for oil-gas exploration. |
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| Keywords: | sequence stratigraphy Changxing Formation organic reef-bank reservoir Northeastem Sichuan |
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