Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (3): 45-50.doi: 10.3969/j.issn.1673-8926.2014.03.008

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Microscopic morphology and formation mechanism of lacustrine source rocks of Hetaoyuan Formation in Biyang Sag

LI Miaomiao 1，2，MA Suping1，XIA Yanqing1，ZHANG Xiaobao1
  

  1. 1. Key Laboratory of Petroleum Resources Research， Institute of Geology and Geophysics， Chinese Academy of Sciences， Lanzhou 730000， China； 2. University of Chinese Academy of Sciences， Beijing 100049， China
  • Online:2014-06-06 Published:2014-06-06

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Abstract:

The study on the lacustrine source rocks of Hetaoyuan Formation in Biyang Sag was carried out by using backscattered electron imaging technology. The study results show that the shape of organic matter mainly denominated in trip, oval biological detritus. The organic matter in source rocks distributed in different forms, so according to the distribution characteristics of organic matters, the source rocks in Biyang Sag can be subdivided three types, including lamination source rocks, scattering organic matter source rocks and intermediate forms source rocks. Meanwhile, according to the analysis of geochemical data, the lamination source rocks is with high organic carbon content, formed in high salinity saltwater environment, with fewer external runoff, the main source of sedimentary organic matter is aquatic organisms, and the kerogen is mainly typeⅠ; scattering organic matter source rocks is with low content of organic carbon, deposited in low salinity freshwater environment, with more external runoff, the main source of sedimentary organic matter are terrestrial and aquatic organisms, and the kerogen is mainly type Ⅱ ; while the sedimentary environment of intermediate forms source rocks is intermediate between the lamination source rocks and the scattering organic matter source rocks.

Key words:  reservoir energy , drive energy , energy index, pressure drop, lift style

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