Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (2): 77-82.doi: 10.3969/j.issn.1673-8926.2015.02.012

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Differences of solvable organic matters with different occurrence states in argillaceous source rocks of coastal shallow-lake facie

  Y ANG Yan 1，2，3， L EI Tianzhu 1，2， GUAN Baowen 1，2，3， TIAN Chuntao 1，2，3， WU Yingqin 1，2   

  1. 1. Key Laboratory of Petroleum Resources Research ， Gansu Province ， Lanzhou 730000 ， China ； 2. Key Laboratory of Petroleum Resources Research ， Institute of Geology and Geophysics ， Chinese Academy of Sciences ， Lanzhou 730000 ，China ； 3. University of Chinese Academy of Sciences ， Beijing 100049 ， China
  • Online:2015-03-03 Published:2015-03-03

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Abstract:

Through stripping silty mudstone of Cretaceous Zhonggou Formation of in Jiuxi Basin step by step, we obtained solvable organic matters with different occurrence states in argillaceous source rocks of coastal shallow-lake facies, and compared the similarities and differences of geochemical characteristics between them. Three kinds of solvable organic matters were stripped, including organic matters adhered on the surface of the minerals, namely chloroform asphalt “A”, solvable organic matters combined solidly or parceled with carbonate, namely chloroform asphalt “C”, and solvable organic matters integrated with silicate closely, namely the chloroform asphalt “E”, respectively. These three kinds of solvable organic matters were obviously different in terms of quantity and geochemical parameters. The analysis results show that chloroform asphalt “A” had the largest number, next is chloroform asphalt “E”, and chloroform asphalt “C” had the least number. However, both the total hydrocarbon and the saturated hydrocarbons and n-alkanes, the number order from most to least was from the chloroform asphalt “A” to chloroform asphalt “C” to chloroform asphalt “E”. OEP value, Pr/Ph ratio and ∑C22-/∑C22+ value show that the maturity of solvable organic matters was gradually increased from chloroform asphalt “A” to chloroform asphalt “C” to chloroform asphalt “E”. These findings suggest that solvable organic matters always prefer to occupy large pore by physical adsorption, then gradually to the meso-porous and microporous in the process of oil and gas migration; and for similar structures of organic molecules, the smaller the weight of the molecular is, the stronger the activity will be and they will accumulate in meso-porous and microporous relatively, and finally makes the crude oil quality better. Carbonate minerals enriched in non-hydrocarbon compositions easily and the silicate minerals concentrate of the non-hydrocarbon easily and heavy constituents, such as asphaltenes simultaneously.These recognitions above will contribute to fine evaluation of hydrocarbon source rocks and further oil and gas exploration.

Key words:  high-precision static correction, variogram, fitting and reconstruction, complex surface areas

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