青西凹陷下白垩统下沟组泥云岩致密油储层特征

孙维凤, 宋岩, 公言杰, 罗群, 王崇孝. 青西凹陷下白垩统下沟组泥云岩致密油储层特征[J]. 地质科学, 2015, 50(1): 315-329. doi: 10.3969/j.issn.0563-5020.2015.21
引用本文: 孙维凤, 宋岩, 公言杰, 罗群, 王崇孝. 青西凹陷下白垩统下沟组泥云岩致密油储层特征[J]. 地质科学, 2015, 50(1): 315-329. doi: 10.3969/j.issn.0563-5020.2015.21
Sun Weifeng, Song Yan, Gong Yanjie, Luo Qun, Wang Chongxiao. The characteristics of Lower Cretaceous Xiagou Formation pelitic dolostone tight oil reservoir, Qingxi sag[J]. Chinese Journal of Geology, 2015, 50(1): 315-329. doi: 10.3969/j.issn.0563-5020.2015.21
Citation: Sun Weifeng, Song Yan, Gong Yanjie, Luo Qun, Wang Chongxiao. The characteristics of Lower Cretaceous Xiagou Formation pelitic dolostone tight oil reservoir, Qingxi sag[J]. Chinese Journal of Geology, 2015, 50(1): 315-329. doi: 10.3969/j.issn.0563-5020.2015.21

青西凹陷下白垩统下沟组泥云岩致密油储层特征

详细信息
    作者简介:

    孙维凤,女,1986年4月生,博士研究生,石油地质学专业.E-mail:sunweifeng1986@163.com

  • 中图分类号: P618.13;TE121

The characteristics of Lower Cretaceous Xiagou Formation pelitic dolostone tight oil reservoir, Qingxi sag

  • 青西凹陷下白垩统下沟组是该区致密油的主要储集层, 本次研究通过普通薄片和铸体薄片观察以及高压压汞等分析测试手段, 从岩石学特征、储集空间类型以及孔隙结构特征等方面剖析下沟组致密泥云岩储层特征.结果表明: 1)下沟组储层岩石类型以深灰色—灰色纹层状泥质白云岩和白云质泥岩为主, 泥级斜长石含量较高, 增大了储层岩石脆性, 易于产生裂缝; 2)泥云岩储层储集空间多样, 既有原生孔隙, 也有因构造和溶蚀作用形成的构造微裂缝和溶蚀缝洞; 3)泥云岩储层的孔隙度和渗透率较低, 属于低孔低渗储层, 不同岩性之间储层物性差别较大; 4)高压压汞测试结果显示: 排驱压力和中值压力较高, 孔喉半径较小, 整体表现出孔隙结构差、非均质性强的特点; 5)根据孔隙结构均质系数Ep将研究区储层分为3类: Ⅰ类储层EpEpEp>1.79, 储层孔喉分选差.
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出版历程
收稿日期:  2014-04-21
修回日期:  2014-08-10
刊出日期:  2015-01-25

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