Quantitative Diagenesis and Diagenetic Facies Analysis on Chang 8 Reservoir of Yanchang Formation in Ordos Basin
详细信息
- 责任者：Chu Meijuan (Research Institute of Exploration and Development ; Changqing Oilfield Company ; PetroChina ; Xi’an 710018 ; China) ; Guo Zhengquan
- 刊名：Natural Gas Geoscience
- 出版年：2013
- 卷期：24(3)
- 关键词：砂岩储集层 ; sandstone reservoirs ; 成岩作用 ; diagenesis ; 鄂尔多斯盆地 ; Ordos Basin
- 页码：p.477-484
- 图表：15 illus., 2 tables, 12 refs.
- 分类号：1003
- issnNo：ISSN1672-1926
- isbnNo：CN62-1177/TE
摘要
Through a large number of thin section observations and experimental analyses about Chang 8interval of Yanchang Formation in Ordos Basin,four main diagenesis types were proposed:mechanical compaction,carbonate cementation,chlorite film cementation and dissolution in Chang 8interval.Based on the calculation of optic compaction rate,apparent cement ratio and optic dissolution rate,combined with the depositional background of study area,we performed division comparison,quantitatively evaluated the diagenetic effects on porosity of different sedimentary areas.The northeastern sedimentary area was controlled by strong compaction and strong cementation,which resulted in the maximum primary pore loss.The western sedimentary area was controlled by weak compaction and moderate cementation,which resulted in the minimum primary pore loss.The southwestern sedimentary area was affected by moderate compaction and moderate cementation,which resulted in relatively less primary pore loss.The northwestern sedimentary area was controlled by strong compaction and strong dissolution,which resulted in relatively greater primary pore loss.Four types of diagenetic facies have been proposed:chlorite membrane and intergranular pore diagenetic facies,feldspar dissolution diagenetic facies,carbonate cementation diagenetic facies,and weak compaction diagenetic facies.The western sedimentary system belongs to weak compaction diagenetic facies,where compaction degree is lower,particles are in point contact,and physical property is best.The southwestern sedimentary system mainly developed chlorite membrane and intergranular pore diagenetic facies with good physical property.The northwestern sedimentary system mainly developed feldspar dissolution diagenetic facies,where chlorite membrane is relatively not well developed and the physical property is relatively good.The northeastern sedimentary system mainly developed carbonate cement dissolution diagenetic facies,where chlorite membrane is relatively weak,intergranular pore is not developed,and physical property is poor.
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