Reservoir Characteristics and Evolution of Diagenetic Porosity of Huagang Formation&nbsp; of Paleogene in the Central Anticlinal Belt of Xihu Sag,Donghai Basin

CAI Quan-sheng,HU Ming-yi,HU Zhong-gui,WANG Dan1.Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,

doi:10.11764/j.issn.1672-1926.2013.04.733

2013 , Vol. 24 >Issue 4: 733 - 740

DOI: https://doi.org/10.11764/j.issn.1672-1926.2013.04.733

Reservoir Characteristics and Evolution of Diagenetic Porosity of Huagang Formation of Paleogene in the Central Anticlinal Belt of Xihu Sag,Donghai Basin

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1.Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,Yangtze University,Wuhan 430100,China;2.School of Geoscience,Yangtze University,Wuhan 430100,China

Received date: 2012-10-11

Revised date: 2012-10-27

Online published: 2013-08-10

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Abstract

Based on the analysis of general thin-section,casting lamella,scanning electron microscope,X-ray diffraction and other analytical methods,the characteristics and evolution of diagenetic porosity of Huagang Formation of Paleogene in the central anticlinal belt of Xihu Sag were studied in detail.The result shows that feldspathic-lithic quartz sandstone is the main sandstone type,with medium maturity of texture and component.Diagenesis is the main controlling factor of reservoir physical properties.During the process of diagenesis,compaction and cementation are the main destructive digenesis,while dissolution is the constructive digenesis.Vitrinite reflectance and other data indicate that Huagang Formation in the northern part buried deeper than 3 600m is at B-period of middle diagenetic stage,while that of the southern part is at A-period,which shows that the reservoir condition of southern part is better than that of the northern part.

Key words： Xihu Sag; Huagang Formation; Diagenesis; Evolution of porosity; Central anticlinal belt

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CAI Quan-sheng,HU Ming-yi,HU Zhong-gui,WANG Dan1.Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education, . Reservoir Characteristics and Evolution of Diagenetic Porosity of Huagang Formation of Paleogene in the Central Anticlinal Belt of Xihu Sag,Donghai Basin[J]. Natural Gas Geoscience, 2013 , 24(4) : 733 -740 . DOI: 10.11764/j.issn.1672-1926.2013.04.733

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