Science & Technology Review >

2014 , Vol. 32 >Issue 12: 41 - 47

DOI: https://doi.org/10.3981/j.issn.1000-7857.2014.12.006

Articles

Porosity Evolution During Diagenesis of Oil-bearing Sandstone in Chang 8 of Longdong Oil-producing Region

  • ZHOU Xiaofeng ,
  • NIU Xiaobing ,
  • WANG Jianguo ,
  • LIANG Xiaowei
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  • 1. MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China;
    2. Research Institute of Exploration and Development, Changqing Oilfield Company, PetroChina, Xi'an 710021, China

Received date: 2014-01-13

  Revised date: 2014-02-21

  Online published: 2014-05-13

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Abstract

The diagenesis and porosity evolution of the oil-bearing sandstone in Chang 8 of Longdong oil-producing region are analyzed by means of casting thin-sections, X-ray diffraction data, scanning electron micrograph observation and physical properties. The oil-bearing sandstone is currently at the first stage of the middle-diagenesis period. It went through strong compaction and violent cementation and weak dissolution, which led to the tight sandstone reservoir. The porosity loss rate of the compaction is 38.9%, the porosity loss rate of the cementation is 38.0%, and the porosity of the dissolution is only 3.9%. The porosity evolution during the diagenesis shows that the primary porosity is 37.3%, the residual intergranular porosity after the compaction and the cementation of the early diagenesis process is 17.9%, the porosity of the first oil charging process is 17.0%, and the porosity of the second oil charging process is only 12.5%, which illustrates that the densification of the oilbearing sandstone occurred between the first oil charging process and the second oil charging process of the middle-diagenesis period.

Key words： Longdong oil-producing region; Chang 8 reservoir set; oil-bearing sandstone; diagenesis process; porosity evolution

Cite this article

ZHOU Xiaofeng , NIU Xiaobing , WANG Jianguo , LIANG Xiaowei . Porosity Evolution During Diagenesis of Oil-bearing Sandstone in Chang 8 of Longdong Oil-producing Region[J]. Science & Technology Review, 2014 , 32(12) : 41 -47 . DOI: 10.3981/j.issn.1000-7857.2014.12.006

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