鄂尔多斯盆地华池长8储层成岩相与孔隙度演化

张创; 孙卫; 高辉; 席天德; 何清阳

doi:10.3799/dqkx.2014.039

Volume 39 Issue 4

Apr. 2014

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Article Navigation > Earth Science > 2014 > 39(4): 411-420

Zhang Chuang, Sun Wei, Gao Hui, Xi Tiande, He Qingyang, 2014. Reservoir Diagenetic Facies and Porosity Evolution Pathways of Chang 8 Formation in Huachi, Ordos Basin. Earth Science, 39(4): 411-420. doi: 10.3799/dqkx.2014.039

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Zhang Chuang, Sun Wei, Gao Hui, Xi Tiande, He Qingyang, 2014. Reservoir Diagenetic Facies and Porosity Evolution Pathways of Chang 8 Formation in Huachi, Ordos Basin. Earth Science, 39(4): 411-420. doi: 10.3799/dqkx.2014.039

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Reservoir Diagenetic Facies and Porosity Evolution Pathways of Chang 8 Formation in Huachi, Ordos Basin

doi: 10.3799/dqkx.2014.039

1.
Research Institute of Shanxi Yanchang Petroleum (Group) Corp.Ltd., Xi'an 710075, China
2.
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China
3.
College of Petroleum Engineering, Xi'an Shiyou University, Xi'an 710065, China

Received Date: 2013-06-27
Publish Date: 2014-04-15

Abstract

Abstract

In order to analyze the genetic relationship between diagenesis and reservoir porosity evolution process and the formation process of physical property difference in different diagenetic facies, diagenesis types and facies of Chang 8 formation are studied in Huachi, Ordos basin. Furthermore, porosity evolutions of different diagenesis facies are simulated quantitatively, and their pathways are analyzed. According to the diagenesis characteristics, the reservoirs can be divided into four diagenesis facies, namely, grain-coating chlorite cementation, corrosion of unstable components, intense compaction with packing and dense carbonate cementation. COPL (compactional porosity loss) of them are 17.6%, 20.5%, 25.8% and 11.4% respectively; CEPL (cementational porosity loss) by early quartz overgrowth, grain-coating chlorite, and carbonate are 4.5%, 4.9%, 5.6% and 24.9% respectively; CRPI (corrosional porosity increase) are 1.4%, 2.3%, 0.2% and 0 respectively; CEPL by late pore-filling chlorite, kaolinite, illite, ferrocalcite and ferrodolomite are 7.8%, 9.7%, 3.2% and 0 respectively. The porosity evolution pathways of different diagenesis facies show that the differences of OP (original porosity) caused by the sediment components and structures are tiny, but the diagenesis types and grades are controlled by sedimentary processes to a great extent. It is concluded that the reservoirs with diagenesis facies have different diagenetic changes and porosity evolution pathways, which results in differences of components, structures and physical properties.
- diagenesis,
- grain-coating chlorite,
- sediments,
- porosity evolution,
- hydrocarbons,
- Ordos basin

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References(40)

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Reservoir Diagenetic Facies and Porosity Evolution Pathways of Chang 8 Formation in Huachi, Ordos Basin

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