济阳坳陷渤南洼陷沙四下亚段沉积序列及石油地质意义

doi:10.3969/j.issn.1672-7703.2019.03.004

中国石油勘探 ›› 2019, Vol. 24 ›› Issue (3): 313-322.DOI: 10.3969/j.issn.1672-7703.2019.03.004

济阳坳陷渤南洼陷沙四下亚段沉积序列及石油地质意义

陈阳^1,2, 张扬³, 朱正杰^1,2, 张瑞刚^1,2, 李良林^1,2, 陈威^1,2, 刘鹏⁴

1 外生成矿与矿山环境重庆市重点实验室;
2 重庆地质矿产研究院;
3 中国石油长庆油田公司第六采油厂;
4 中国石化胜利油田分公司勘探开发研究院

收稿日期:2017-08-17 修回日期:2018-10-24 出版日期:2019-05-15 发布日期:2019-05-14
基金资助:
国家科技重大专项“渤海湾盆地南部油气资源潜力再认识”（2011ZX05006）。

Early sedimentary sequence and petroleum geological significance of faulted basins: a case study on the lower Es₄ in Bonan sag, Jiyang depression

Chen Yang^1,2, Zhang Yang³, Zhu Zhengjie^1,2, Zhang Ruigang^1,2, Li Lianglin^1,2, Chen Wei^1,2, Liu Peng⁴

1 Chongqing Key Laboratory of Exogenic Mineralization and Mine Environment;
2 Chongqing Institute of Geology and Mineral Resources;
3 Sixth Oil Production Plant, PetrolChina Changqing Oilfield Company;
4 Exploration and Development Research Institute, Sinopec Shengli Oilfield Company

Received:2017-08-17 Revised:2018-10-24 Online:2019-05-15 Published:2019-05-14
Supported by:

摘要/Abstract

摘要： 近年的勘探实践表明，断陷盆地早期不但沉积有氧化环境下的相类型，而且还存在半还原和还原环境沉积相。为搞清断陷盆地早期较为完整的沉积序列及其石油地质意义，以渤南洼陷沙四下亚段为例，综合应用钻井、测井及分析化验资料开展研究。结果表明：断陷盆地早期除沉积有传统认识下的冲积扇、辫状河沉积相外，还沉积有辫状河三角洲、扇三角洲及湖泊等相类型；原始沉积边界恢复和沉积中心分析表明渤南洼陷沙四下亚段冲积扇和辫状河的主要冲积方向为北北东向，辫状河入湖形成的辫状河三角洲展布于北西向带状的湖盆之中，“源—汇”体系控制下，断陷盆地早期可形成冲积扇—辫状河—辫状河三角洲—湖泊这一较为完整的沉积序列；冲积—湖泊沉积体系的再认识不但使原本“贫瘠”的“红层”具有了一定的生油气潜力，而且新认识的辫状河三角洲沉积可形成有利储集体和圈闭，从而“红层”勘探空间得到拓展。

关键词: 沉积序列, 沙四下亚段, 渤南洼陷, 石油地质意义, 断陷盆地早期

Abstract: The exploration practice in recent years shows that not only sedimentary facies exist in the oxidized environment but also in the semi-reduced and reduced environment in the early stage of the faulted basin. In order to find out the relatively complete sedimentary sequence and its petroleum geological significance in the early stage of the faulted basin, taking the lower Es₄ (the fourth member of Shahejie Formation) in Bonan sag as an example, comprehensive analysis has been carried out on drilling, logging and experimental data. The results show that in the early stage of the faulted basin, in addition to the alluvial fan and the braided river understood traditionally, river delta, fan delta and lake were deposited. Original sedimentary boundary restoration and sedimentary center analysis indicate that the primary direction of the alluvial fan and the braided river in the lower Es₄ is NNE; the braided river delta formed by the braided river into the lake is in the NW banded lake basin; and under the control of the "source-sink" system, a relatively complete sedimentary sequence of alluvial fan-braided river-braided river delta-lake could be developed in the early stage of the faulted basin. The re-understanding of the alluvial-lake sedimentary system not only makes the originally "barren" red layer have a certain potential for hydrocarbon generation, and the newly identified braided river delta may provide favorable reservoirs and traps, thus expanding the exploration space of the "red layer".

Key words: sedimentary sequence, early fault basin, lower Es₄, Bonan sag, petroleum geological significance

中图分类号:

陈阳, 张扬, 朱正杰, 张瑞刚, 李良林, 陈威, 刘鹏. 济阳坳陷渤南洼陷沙四下亚段沉积序列及石油地质意义[J]. 中国石油勘探, 2019, 24(3): 313-322.

Chen Yang, Zhang Yang, Zhu Zhengjie, Zhang Ruigang, Li Lianglin, Chen Wei, Liu Peng. Early sedimentary sequence and petroleum geological significance of faulted basins: a case study on the lower Es₄ in Bonan sag, Jiyang depression[J]. China Petroleum Exploration, 2019, 24(3): 313-322.

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济阳坳陷渤南洼陷沙四下亚段沉积序列及石油地质意义

Early sedimentary sequence and petroleum geological significance of faulted basins: a case study on the lower Es₄ in Bonan sag, Jiyang depression

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济阳坳陷渤南洼陷沙四下亚段沉积序列及石油地质意义

Early sedimentary sequence and petroleum geological significance of faulted basins: a case study on the lower Es4 in Bonan sag, Jiyang depression

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Early sedimentary sequence and petroleum geological significance of faulted basins: a case study on the lower Es₄ in Bonan sag, Jiyang depression