| 摘要: |
| 通过成岩作用及储层物性的综合分析,该区主要油层组长9、长8、长6及长2的岩石成分成熟度和结构成熟度均较差,均经历了晚成岩A期。压实作用降低了储层的孔隙度,致密的碳酸盐岩胶结降低了孔隙度并阻止了次生孔隙的产生。该区储层为低孔低渗储层,孔隙度在4%~8%之间,渗透率多小于0.1×10-3μm2。 |
| 关键词: 鄂尔多斯盆地 延长组 成岩作用 孔隙演化 物性特征 |
| DOI： |
| 附件 |
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| 基金项目: |
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| Diagenesis and physical property of the Yanchang Formation sandstone reservoirs in southeastern Ordos Basin |
| TIAN Ya-ming, SHI Ze-jin, WANG Chang-cheng, SONG Jiang-hai, WANG Yong, WANG Jian-hui |
(1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China;
2. Changqing Oil Field Company, Xi'an 710021, Shaanxi, China) |
| Abstract: |
| The combination of petrology,diagenesis and physical property of the Yanchang Formation sandstone reservoirs in southeastern Ordos Basin has revealed that the Chang-9,Chang-8,Chang-6 and Chang-2 oil reservoirs consist dominantly of feldspathic litharenite,lithic feldspathic sandstone and feldspathic sandstone with poor compositional and textural maturity.The decrease of the porosity by compaction and carbonate cementation resulted in the generation of the low-porosity and low-permeability sandstone reservoirs in the study area.The porosity tends to range between 4% and 8%,and the permeability is generally less than 0.1×10-3 μm2.The Chang-6 oil reservoirs are the best sandstone reservoirs with good porosity and permeability,and the Wang-9 well is believed to be the favourable sedimentary facies zone due to better physical properties of the sandstone reservoirs. |
| Key words: Ordos Basin Yanchang Formation diagenesis porosity evolution physical property |
