| 鄂尔多斯盆地镇泾区块延长组长81储层成岩作用特征及其对储集物性的影响 |
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| 引用本文： | 张霞,林春明,陈召佑,周健,潘峰,俞昊.鄂尔多斯盆地镇泾区块延长组长81储层成岩作用特征及其对储集物性的影响[J].地质科学,2011,46(2):530-548. |
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| 作者姓名： | 张霞 林春明 陈召佑 周健 潘峰 俞昊 |
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| 作者单位： | （1.南京大学地球科学与工程学院内生金属矿床成矿机制研究国家重点实验室 南京 210093；2.中国石化股份有限公司华北分公司河南郑州 450006） |
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| 基金项目： | 中国石油化工股份有限公司华北分公司科研项目 |
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| 摘 要： | 鄂尔多斯盆地镇泾区块上三叠统延长组长81储层具有成分成熟度低,结构成熟度中等到好的特点,岩性以岩屑长石砂岩和长石岩屑砂岩为主.长81砂岩属于特低孔特低渗储层,以次生溶蚀粒间孔为主要储集空间.目前储层正处于中成岩阶段A期,主要发育压实、胶结、溶解和交代4种成岩作用类型.机械压实作用是造成长81储层埋深小于2000 m砂岩...
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| 关 键 词： | 成岩作用 储集物性 长81储层砂岩 镇泾区块 鄂尔多斯盆地 |
| 收稿时间： | 2010-08-03 |
Diagenesis and its influence on reservoir quality of Chang 81 sandstones from Upper Triassic Yanchang Formation in Zhenjing area, Ordos Basin |
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| Zhang Xia,Lin Chunming,Chen Zhaoyou,Zhou Jian,Pan Feng,Yu Hao.Diagenesis and its influence on reservoir quality of Chang 81 sandstones from Upper Triassic Yanchang Formation in Zhenjing area, Ordos Basin[J].Chinese Journal of Geology,2011,46(2):530-548. |
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| Authors: | Zhang Xia Lin Chunming Chen Zhaoyou Zhou Jian Pan Feng Yu Hao |
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| Institution: | 1.State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093;2.Huabei Branch Company, SINOPEC, Zhengzhou, Henan 450006 |
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| Abstract: | Chang 81 reservoir sandstones of upper Triassic Yanchang Formation in Zhenjing area of Ordos Basin mainly consist of feldspathic litharenite and lithic arkose，with low mineralogical maturity and median high textural maturity.They belong to extra low porosity and permeability reservoirs，with dissolved intergranular pores as the chief accumulation space.The Chang 81 reservoir sandstones are now in the A stage of mesodiagenesis，and the main diagenesis of which including compaction，cementation，dissolution and replacement.The mechanical compaction，which principally took place in the early time of burial history，is the predominant reason for reservoir quality deterioration of Chang 81 sandstones with burial depth above 2〖CS％0，0，0，0〗〖CS〗000 m.Accompanied by the different cementation and dissolution taking place progressively with the burial depth increasing，the destruction degree resulted by mechanical compaction was weakened.The destruction impact of cementation is characterized by precipitation of different cement in primary and secondary pores，in which the cementation of authigenic clay minerals and late stage carbonate have exerted a dominant influence on reservoir quality，making the porosity and permeability decreased quickly.However，the pore lining chlorite，authigenic kaolinite and early stage carbonate cement have dual effects on reservoir quality，and the constructive influence of pore lining chlorite cementation over the destructive one.The pore lining chlorite has preserved the reservoir quality by weakening the degree of mechanical compaction，inhibiting the subsequent generation of quartz cement，and providing the passageways for the entrance of acid fluid of the A stage of mesodiagenesis and flowout of dissolved resultant products，making a large number of secondary pores produced.Dissolution is the key factor for the formation of secondary pores and improvement of pore throat structures of Chang 81 reservoir sandstones.There are four dissolution zones in the Chang 81 sandstones，located in the vicinity of 1800 m， 2000 m， 2100 m，and 2300 m perspectively，with the feldspar as the main dissolved grain type.The result shows that the sandstone intervals with dissolution and pore lining chlorite cementation occurring together are the optimum zones for the oil and gas accumulation. |
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| Keywords: | Diagenesis Reservoir quality Chang 81 reservoir sandstones Zhenjing area Ordos Basin |
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