| 任大忠.鄂尔多斯盆地华庆油田长81段储层物性影响因素[J].地质与勘探,2014,50(3):591-598 |
| 鄂尔多斯盆地华庆油田长81段储层物性影响因素 |
| Influential factors in the physical properties of the Chang 81 reservoir, Yanchang Formation in the Huaqing Oilfield, Ordos Basin |
| 投稿时间：2013-04-13 修订日期：2013-08-12 |
| DOI： |
| 中文关键词: 物性 沉积作用 成岩作用 华庆油田 |
| 英文关键词: physical properties, diagenesis, deposition, Huaqing oil field |
| 基金项目:国家科技重大专项大型油气田及煤层气开发（2011ZX05044）和陕西省科技统筹创新工程(2011KTZB01-04-01)联合资助 |
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| 中文摘要: |
| 在综合大量样品测试数据与图像的基础上，研究了华庆油田长81段储层特征和物性影响因素。研究表明：砂岩岩性以中细砂岩与细砂岩岩屑长石砂岩和长石岩屑砂岩为主，储集空间以剩余原生粒间孔和长石溶孔为主。孔隙类型以中孔隙和小孔隙为主，优势孔隙具有双孔隙结构特征。储层类型为低孔特低渗-超低渗岩性油藏，储层孔喉半径与物性具有正相关的分带性。沉积作用-成岩作用共同影响着储层的发育特征，较好的物性发育在中粒岩屑长石砂岩、细－中粒岩屑长石砂岩与细粒岩屑长石砂岩的砂体中，压实作用使原生孔隙度损失21.92%，胶结作用使原生孔隙度损失8.61%%，溶蚀作用使孔隙度贡献了4.46% 。继续研究沉积和成岩作用对储层物性特征的影响，将有利于认识和处理同类储层的勘探开发的难度。 |
| 英文摘要: |
| This paper investigates the physical properties and their influential factors of the Chang-81 reservoir, Yanchang Formation in the Huaqing oil field based sample tests and images. The results show that the sandstones are dominated by middle-fine sandstone, packsand, lithic feldspathic sandstone and feldspathic lithic sandstone. The pore space of the reservoir includes the remaining intergranular pores and feldspar dissolution porosity. Tiny pore and mesopore are the main pore configurations. The dominant pores exhibit the characteristic of a dual pore structure. And thus it belongs to low porosity and extra low permeability- ultra-low permeability oil reservoir. The radius of reservoir pore throat grows in a direct proportion to the physical property. The deposition and diagenesis jointly affected the developmental characteristics of the reservoir. Medium-grained lithic arkosic sandstone, fine - medium grained lithic arkosic sandstone and fine-grained lithic arkosic sandstone show better physical properties. The decrease of sandstone porosity is mainly caused by compaction, cementation and dissolution, which contribute 21.92%, 8.61% and 4.46% to the loss of primary pores, respectively. Further studies on influence of deposition and diagenesis on reservoir’s physical properties would help understand and deal with the difficult degree in exploration and development for similar reservoirs. |
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