Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (2): 33-40.doi: 10.3969/j.issn.1673-8926.2016.02.005

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Gas exploration prospects of the Upper Paleozoic in Tongxu area,southern North China Basin

Wang Fubin1， Ma Chao2， An Chuan2   

  1.  1. Department of Petroleum Exploration ， North China Oil & Gas Field Branch ， Sinopec ， Zhengzhou 450006 ， China ； 2. Research Institute of Exploration and Development ， North China Oil & Gas Field Branch ， Sinopec ， Zhengzhou 450006 ， China
  • Online:2016-03-20 Published:2016-03-20

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Abstract:

The Carboniferous and Permian strata in Tongxu area of southern North China Basin are relatively complete preserved. The natural gas reservoir conditions are similar to those of the Ordos Basin. Based on the theory of tight sandstone gas reservoir forming in Ordos Basin, the basic petroleum geological conditions and the relationship between trap formation period and gas migration and accumulation period of the Upper Paleozoic were analyzed, then the gas exploration prospects of this area can be explicit. The research shows that the coal of Carboniferous and Permian in Tongxu area is well developed, the average organic carbon content of coal is 62.9%, the average maturity of organic matter is 3.34%, and the organic matter of coal belongs to Ⅱ2 type, which is a good regional source rock. Reservoir rocks mainly distributed in a large area of delta plain distributary channel sandstone, and average porosity is 2.7%, the average permeability is 2.25 mD, and intergranular pore and intergranular dissolved pore are developed. Mudstone of Upper and Lower Shihezi Formation is developed. The breakthrough pressure of mudstone saturated with gas is 5.88-9.80 MPa, and it is a good regional cap rock. The tight sandstone lithologic trap is the most favorable trap type, and it formed before the hydrocarbon generation, and the matching relationship is good. The central and southern area of the Weibei Slope is favorable for the development of tight sandstone lithologic gas reservoir.

Key words:  diagenesis , Jurassic , Niudongarea , eastern Altun foreland , QaidamBasin

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