首页> 中文期刊> 《成都理工大学学报(自然科学版)》 >鄂尔多斯盆地油田水化学特征及地质意义

鄂尔多斯盆地油田水化学特征及地质意义

         

摘要

鄂尔多斯盆地三叠系延长组和侏罗系延安组油层水与油藏保存条件关系复杂,通过成藏过程和不同层系地层水化学特征研究和对比分析,得出如下几点认识:①延长组和延安组油层水矿化度总体较高,属于盐水-卤水地层水类型,Na+,K+和Cl-高度富集是高矿化度的原因;②沉积期古盐度特征对延长组现今地层水矿化度有明显控制作用,油层的水文地质条件稳定,封闭性能较好,有利于油藏后期保存;③印支期末剥蚀暴露期的大气水淋滤作用影响,是造成延长组顶部长1油层和长2油层水矿化度变低的主要因素,油藏保存条件明显降低;④侏罗系开放的水文地质环境及煤系地层自身释放的CO2是造成侏罗系油层水具备NaHCO3水性质和水文地质环境活跃的主要原因,油藏保存条件相对较差.%The relationship between the oilfield water from the Triassic Yanchang Formation and Jurassic Yan'an Formation and the sealing conditions in Ordos Basin is complicated. The following points are obtainedby studying, analysing and comparing the geochemical features of hydrocarbon accumulation processes and different oilfield waters from different formations. ① The Yanchang Formation and Yan'an Formation oilfield waters with high mineralization are brine or even bittern because of their extremely concentrated Na+ , K+ and Cl- . ② The present mineralization of Yancbang Formation is obviously controlled by the palaeosalinity during deposition. Stable hydrogeological conditions and good sealing conditions are favorable for the late reservoir preservation. ③ The lower oilfield water salinity from the top Chang 1 and Chang 2 is mainly attributed to the atmospheric water leaching due to the tectonic uplift and exposure at the end of Indosinian movement, leading to the worse sealing conditions. ④ Both the open hydrogeological environment of Jurassic system and the CO2 released by its own coal-bearing strata in diagenetic processes form the NaHCO3-type oilfield water and active hydrogeological conditions, thus resulting in bad sealing conditions. The above understandings are of great significance for the rational exploration and development of the Yanchang Formation and Yan'an Formation reservoirs.

著录项

  • 来源
    《成都理工大学学报(自然科学版)》 |2012年第5期|502-508|共7页
  • 作者单位

    中国石油长庆油田分公司勘探开发研究院,西安710018;

    低渗透油气田勘探开发国家工程实验室,西安710018;

    中国石油长庆油田分公司勘探开发研究院,西安710018;

    低渗透油气田勘探开发国家工程实验室,西安710018;

    中国石油长庆油田分公司勘探开发研究院,西安710018;

    低渗透油气田勘探开发国家工程实验室,西安710018;

    中国石油长庆油田分公司勘探开发研究院,西安710018;

    低渗透油气田勘探开发国家工程实验室,西安710018;

    中国石油长庆油田分公司勘探开发研究院,西安710018;

    低渗透油气田勘探开发国家工程实验室,西安710018;

    中国石油长庆油田分公司勘探开发研究院,西安710018;

    低渗透油气田勘探开发国家工程实验室,西安710018;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 TE133;
  • 关键词

    油田水; 地球化学; 矿化度; 油藏; 延长组; 延安组; 鄂尔多斯盆地;

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