The Study on Diagenetic Characteristics of Coal Measures Sandstone Reservoir in Xishanyao Formation, Southern Margin of the Junggar Basin

Aobo Zhang, Shida Chen, Dazhen Tang, Shuling Tang, Taiyuan Zhang, Yifan Pu and Bin Sun
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Aobo Zhang: School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
Shida Chen: School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
Dazhen Tang: School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
Shuling Tang: School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
Taiyuan Zhang: School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
Yifan Pu: School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
Bin Sun: Unconventional Research Institute, Research Institute of Petroleum Exploration and Development, Beijing 100083, China

Energies, 2022, vol. 15, issue 15, 1-24

Abstract: The reservoir physical properties, pore types, diagenetic characteristics and reservoir quality controlling effect of the Xishanyao formation coal measure sandstone in the southern margin of the Junggar basin were discussed in this study based on thin section observation, high pressure mercury injection, low-temperature nitrogen adsorption and scanning electron microscope observation. The result shows that the porosity and permeability of the sandstone are generally low with a medium-high texture maturity and low compositional maturity. The sandstone storage space is mainly composed of residual intergranular pores, secondary dissolution pores, inter-crystalline pores and micro-fractures. The diagenetic stage of coal measure sandstone is in the mesodiagenesis A1-A2 stage, and their diagenetic interaction types mainly include compaction, cementation and dissolution. The reservoir quality of the coal measure sandstone deteriorates by compaction due to high matrix content and plastic debris content. Because of the large amounts of organic acids generated during the thermal evolution of the coal measure source rock, the coal measure sandstone suffers from strong dissolution. The secondary dissolution pores formed by the massive dissolution of feldspar, lithic fragments and early carbonate cementation in the sandstone significantly improved the reservoir quality. In the coal measure sandstone, clay mineral cementation is the most developed cementation form, followed by quartz cementation and carbonate cementation. Although kaolinite cementation and dolomite cementation can generate a small number of inter-crystalline pores, cementation deteriorates the reservoir quality. The Xishanyao formation coal measure sandstone formed in a lacustrine-delta environment, and its composition and texture make it susceptible to the influence of compaction and dissolution during diagenesis.

Keywords: tight sandstone; coal measure; southern margin of Junggar basin; diagenetic process; reservoir quality control; reservoir forming (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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