Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (5): 47-50.doi: 10.3969/j.issn.1673-8926.2014.05.009

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Diagenesis and its influence on reservoirs of Pliocene in a block of Moattama Bay Basin

WANG Yingchao1， WANG Qiang2， SUN Zuoxing3   

  1. 1. Zhanjiang Branch， CNOOC Energy Technology & Service-Drilling & Production Co.， Zhanjiang 524057， Guangdong， China；2. Wuhan Center of Geological Survey， China Geological Survey， Wuhan 430205， China；3. PetroChina Research Institute of Petroleum Exploration ＆ Development， Beijing 100083， China
  • Online:2014-10-20 Published:2014-10-20

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Abstract:

The Moattama Bay Basin is located in the back-arc strike slip and extensional tectonic position with oil and gas enrichment, seeking favorable reservoirs become the key for the breakthrough of petroleum exploration in this area. By using techniques of casting thin section and X-diffraction, this paper analyzed mineral characteristics and diagenesis of Pliocene sandstone reservoirs in a block of Moattama Bay Basin. It is believed that the rock types of sandstone reservoir are mainly feldspar quartz sandstone and lithic quartz sandstone, with moderate maturity mostly. As a whole, the study area experienced diagenesis of compaction, cementation and dissolution, which influenced reservoir properties little. In the south of the study area, compaction is a main factor influences the reservoir properties dominantly. Destructive diagenesis has little effect on the porosity loss, so Pliocene formations possess advantages of forming hydrocarbonbearing reservoirs in this area.

Key words: heterogeneity, gas reservoir with water, development of horizontal well, flow rate profile, pressure profile

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