Types of clay minerals and its effects on reservoir properties of Chang 6 oil reservoir set in Huaqing area, Ordos Basin
Online published: 2012-06-20
Based on thin section analysis, X-ray diffraction and scanning electronic microscope analyses, this paper studied the types, occurrence of clay minerals and its influence on reservoir properties of Chang 6 oil reservoir set in Huaqing area. The result shows that the clay minerals in Chang 6 oil reservoir set mainly consist of chlorite, illite and illite/smectite mixed layer, and the average content of clay minerals is approximately 4.55% . Authigenic chlorite commonly occurs as pore-lining cement, which is beneficial to protect porosity of deeply buried sandstones. The occurrence of illite and illite/smectite mixed layer is pore bridging or pore filling, which will block up pore spaces and reduce throat radius, and have negative effect on sandstone reservoir. Authigenic kaolinite in Chang 6 oil reservoir set in Huaqing area is not developed. High matrix content makes the reservoir experience intense compaction earlier than acidic fluid, and the influence of acidic fluid from Chang 7 hydrocarbon rocks is limited for Chang 6 oil reservoir set, both of them result in the lack of intergranular volume and active acidic fluid for kaolinite.
DOU Hongen . Types of clay minerals and its effects on reservoir properties of Chang 6 oil reservoir set in Huaqing area, Ordos Basin[J]. Lithologic Reservoirs, 2012 , 24(3) : 66 -73 . DOI: 10.3969/j.issn.1673-8926.2012.03.013
/
| 〈 |
|
〉 |