石油与天然气地质 ›› 2014, Vol. 35 ›› Issue (1): 65-76.doi: 10.11743/ogg20140109

• 层序与储层 • 上一篇    下一篇

川南地区三叠系须家河组致密砂岩孔隙类型及物性控制因素

祝海华1,2, 钟大康1,2, 张亚雄3, 孙海涛1,2, 杜本强4, 孟昊1,2, 张春伟1,2, 杨喆1,2   

  1. 1. 中国石油大学 油气资源与探测国家重点实验室, 北京 102249;
    2. 中国石油大学 地球科学学院, 北京 102249;
    3. 中国石化 石油勘探开发研究院, 北京 100083;
    4. 中国石油 西南油气田分公司蜀南气矿, 四川 泸州 646000
  • 收稿日期:2013-10-20 修回日期:2013-12-20 出版日期:2014-02-08 发布日期:2014-03-26
  • 作者简介:祝海华（1987—），男，博士研究生，储层地质学。E-mail：retinaabcd@163.com。
  • 基金资助:
    国家重点基础研究发展计划（“973”计划）项目（2011CB201104）；国家自然科学基金项目（41302108）。

Pore types and controlling factors on porosity and permeability of Upper Triassic Xujiahe tight sandstone reservoir in Southern Sichuan Basin

Zhu Haihua1,2, Zhong Dakang1,2, Zhang Yaxiong3, Sun Haitao1,2, Du Benqiang4, Meng hao1,2, Zhang Chunwei1,2, Yang Zhe1,2   

  1. 1. State Key Lab of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;
    2. School of Earth Science, China University of Petroleum, Beijing 102249, China;
    3. Exploration and Production Research Institude, SINOPEC, Beijing 100083, China;
    4. Luzhou Gas District, Southwest Oil and Gas Field Co., Ltd., PetroChina, Luzhou, Sichuan 646000, China
  • Received:2013-10-20 Revised:2013-12-20 Online:2014-02-08 Published:2014-03-26

PDF (PC)

654

被引次数

42

摘要： 通过普通及铸体薄片、扫描电镜、岩心物性及压汞数据等资料，研究了川南地区须家河组致密砂岩储层的孔隙类型和物性特征，并探讨了孔隙发育类型、孔-渗关系控制因素及砂岩物性空间变化与沉积条件的关系。结果表明，川南地区须家河组以原生粒间孔发育为特征，次为溶蚀孔隙和晶间微孔，渗透率随孔隙度增加呈迅速增加—稳定—再次增加的三段式分布，主要原因是绿泥石、伊利石胶结物的生长抵消了孔隙度增加对渗透率的贡献。平面上，砂岩物性的变化与沉积条件密切相关：短距离搬运或沉积水动力弱的砂岩成分及结构成熟度差，物性差；长距离搬运且沉积于强水动力条件的砂体孔隙发育。纵向上，单一河道砂体的中-中下部物性好于顶、底部，原因是河道沉积时水动力由强变弱，砂体中部成分、结构成熟度好于顶、底部，这也导致了砂体内部成岩作用的非均质性，并最终影响了孔隙的纵向分布。

关键词: 孔隙类型, 物性特征, 致密砂岩, 须家河组, 四川盆地

Abstract: Based on thin sections,scanning electron microscopy(SEM),core porosity and permeability data,and mercury injection data,this paper summarized the pore types,physical property of tight sandstone of the Xujiahe Formation and discussed the controlling factors on pore types,poroperm relationship and spatial change of physical property.The result shows that the rapid compaction process and minor dissolution resulted in the relative abundant of primary pore followed by dissolution pore and intergrannular micropore.As the porosity increases,the permeability change shows a three-stage pattern,namely rapid increasing first,then getting stabilized and increasing again.This distribution pattern is mainly controlled by pore throat filling authigenic chlorite and illite which offset the increases in permeability due to the increase of porosity.The poor connectivity of dissolution pore and micropore also influence the permeability of sandstone.The spatial change of physical property of sandstone is controlled by sedimentary condition.The relative short transport distance or low energy environment resulted in low compositional and textural maturity and poor physical property.Only the sandstone with long transport distance and high energy environment are abundant in porosity.The physical quality in middle and lower part of single fluvial sandstone is better than that of the upper and bottom parts.The major reason is that the decreases of energy during fluvial sandstone deposition result in higher compositional and textural maturity of the middle part and lead to the diagenetic heterogeneity within a single sandstone.

Key words: pore type, porosity and permeability, tight sandstone, Xujiahe Formation, Sichuan Basin

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