Diagenesis and its quantitative evaluation of the second member of Kongdian Formation in Cangdong Sag, Huanghua Depression
Online published: 2013-06-01
Based on systematic observation of normal and cast thin section, scanning electronic microscope, cathodoluminescene and analysis of X-ray, the characteristics of main diagenesis of the second member of Kongdian Formation in Cangdong Sag were analyzed. The result shows that it is of medium-strong compaction, medium cementation and strong dissolution in Nanpi slope, where clay coats can restrain the quartz enlargement and protect the primary and secondary dissolved pores. Shenvsi fault-nose is characterized by medium compaction, low cementation and strong dissolution. Kongdian tectonic zone is characterized by low compaction, medium cementation and low dissolution. The quantitative analysis of diagenesis shows that compaction, cementation and dissolution can cause -26.1%, -4.3% and 6.0% of porosity fluctuations respectively, and dissolution is important constructive diagenesis.
NAN Shan , HAN Xuefang , PAN Lingli , WANG Yuxiu , LIU Zhigang . Diagenesis and its quantitative evaluation of the second member of Kongdian Formation in Cangdong Sag, Huanghua Depression[J]. Lithologic Reservoirs, 2013 , 25(3) : 28 -35 . DOI: 10.3969/j.issn.1673-8926.2013.03.005
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