Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (6): 98-105.doi: 10.3969/j.issn.1673-8926.2014.06.016

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Study on major secondary minerals in volcanic reservoir in Xujiaweizi area, Songliao Basin

LI Xin1， DU Dedao1， CAI Yuwen2， WANG Shan1    

  1.  1. PetroChina Research Institute of Petroleum Exploration & Development ， Beijing 100083 ， China ； 2. School of Earth Sciences and Resources ， China University of Geosciences ， Beijing 100083 ， China
  • Online:2014-11-20 Published:2014-11-20

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Abstract:

 Based on the volcanic rock core observation of more than 50 wells in Xushen Gas Field,this paper studied the deep volcanic reservoir in Xujiaweizi area in northern Songliao Basin. The result shows that the rock types of deep volcanic reservoir include basic rock, neutral rock and acidic rock, with the acidic rock being dominated. Volcanic lava includes basalt, andesite, trachyte and rhyolite, while volcaniclastic rock includes tuffs, rhyolitic ignimbrites, volcanic breccia and agglomerate. Through thin section observation by microscope, it is discovered that the volcanic rocks are in a variety of different degrees of metasomatism which formed many secondary minerals such as laumontite, chlorite, quartz,feldspar, siderite, calcite and clay mineral filling in pores and cracks. The characteristics of these secondary minerals were detailedly described and their forming thermodynamics conditions were simulated according to the third law of thermodynamics. According to the chemical equation of laumontite, chlorite and quartz, combined with the ionic concentration of K+, Ca+, Na+，H+, （Fe, Mg）2+ and （Fe, Al）3+ in formation water, we can work out the equilibrium constant K, and then calculate the ΔG（P，T） values under different temperature and pressure according to the equation ΔG（0T） ＝ -R·T·ln K. By comparing the ΔG（P，T） values of laumontite, chlorite and quartz, the formation time order was determined. The chlorite is formed firstly then the quartz, and the last one is laumontite. The thermodynamic simulation result can be proofed by microscope observation, which provides thermodynamics proof for the study on diagenetic evolution of secondary minerals in volcanic reservoir.

Key words: wide field electromagnetic method , oil and gas exploration , electric structure , QaidamBasin

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