| 摘要: |
| 综合利用岩石薄片、埋藏史及流体包裹体等资料,对民丰北带古近系沙三段成岩演化及其对储层物性的影响进行研究。结果表明:沙三段沉积初期至距今38 Ma成岩作用主要为压实作用,距今38～32 Ma发生第一期酸性溶解,距今32～25 Ma发生石英溶解、碳酸盐胶结及第一期油气充注,距今25～2 Ma发生第二期酸性溶解及第二期油气充注,距今约2 Ma发生晚期碳酸盐胶结,距今2 Ma至现今发生第三期酸性溶解及第三期油气充注;对储层物性演化影响较大的主要有压实作用、碳酸盐胶结、酸性溶解及油气充注;第一期油气充注发生在碳酸盐胶结的早中期,抑制了碳酸盐继续胶结,使孔隙得以保存,未发生油气充注或充注弱的储层中碳酸盐胶结强烈,孔隙多大量损失,现今物性较差。 |
| 关键词: 成岩演化 沙三段 民丰北带 东营凹陷 |
| DOI：10.3969/j.issn.1673-5005.2011.05.002 |
| 分类号::TE 122.2 |
| 文献标识码:A |
| 基金项目:国家油气重大专项课题(2008ZX05051-02);国家自然科学基金项目(L40972080) |
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| Diagenetic evolution of Es3 reservoir and its influence on property in the northern Minfeng sub sag of Dongying sag |
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CAO Ying chang1, CHEN Lin1,2, WANG Yan zhong1, SUI Feng gui1,2
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(1.School of Geosciences in China University of Petroleum, Qingdao 266555, China;2.Western New Prospect Research Center, Shengli Oilfield, Dingying 257015, China)
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| Abstract: |
| Through the analysis of lots of rock thin sections of Es3 formation in the northern Minfeng sub sag of Dongying sag, combined with the homogenization temperature analysis of fluid inclusion and burial history, the process of diagenetic evolution and its influence on the reservoir property were studied. The diagenetic sequence is:from the beginning of the deposition of Es3 to 38 Ma ago, the main type of diagenesis is compaction; from 38 to 32 Ma ago, the first phase of acid dissolution; from 32 to 25 Ma ago, quartz dissolution/ carbonate cementation and the first phase of hydrocarbon filling; from 25 to about 2 Ma ago, the second phase of acid dissolution and hydrocarbon filling; about 2 Ma ago, the later carbonate cementation; from 2 Ma ago until now, the third phase of acid dissolution and hydrocarbon filling. Among them,compaction, carbonate cementation, acid dissolution and former hydrocarbon filling exert the most important effect on the evolution of reservoir physical property. The first phase of hydrocarbon filling occurred in the early and medium stage of carbonate cementation, which hindered the carbonate cementation, and the porosity would be preserved. If hydrocarbon filling didn 't occur or the hydrocarbon filling was not enough, carbonate cementation would be intensive, and the property would be poor. |
| Key words: diagenesis evolution Es3 north of Minfeng sub sag Dongying sag |
