LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (5): 98-103.doi: 10.3969/j.issn.1673-8926.2015.05.016

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Comprehensive evaluation of geological sweet point of tight gas of Shahezi Formation in Xujiaweizi fault depression

Zhang Dazhi， Zhang Xiaodong， Yang Buzeng   

  1.  Research Institute of Exploration and Development ， PetroChina Daqing Oilfield Company Ltd. ，Daqing 163712 ， Heilongjiang ， China
  • Online:2015-09-26 Published:2015-09-26

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Abstract:

The tight sandstone gas prospecting is a key area of unconventional oil and gas exploration. Shahezi Formation in Xujiaweizi fault depression possesses a geological condition for forming large-area tight gas reservoir. The Shahezi Formation developed in faulted basin, and it is close to the source with features of fast phase change and strong heterogeneity. The following comprehensive evaluation methods for tight gas sweet point were formed preliminarily: sequence study determines its prospective, source rock fixes its potential, reservoir study identifies grade, comprehensive study confirms zone, and sweet point study makes well location. It is considered that Anda area is the preferred favorable zone. The facies such as underwater distributary channel and sheet sand of fan delta front, and underwater distributary channel and channel mouth bar of braided river delta front are favorable development zone for reservoirs. Combined fine seismic interpretation with prestack inversion, 12 sweet point bodies were forecasted in Anda area, which provides an effective guidance for exploration and deployment, and makes breakthrough of tight gas exploration of Shahezi Formation.

Key words: subtle reservoir, hydrocarbon reservoir distribution, hydrocarbon accumulation model, main controlling factors, Lixian slope

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