Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (3): 20-26.doi: 10.3969/j.issn.1673-8926.2016.03.004

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Characteristics and formation mechanism of Chang6 reservoir in Jiyuanarea

Liu Zhenwang1,Zheng Xi2，Zhong Zhangqi1,3，Hou Dujie3,Liu Minzhao2   

  1. 1． No. 5 Oil Production Plant ， Sinopec Zhongyuan Oilfield Company ， Puyang 457001 ， Henan ， China ； 2． No. 5 Oil Production Plant ， PetroChina Changqing Oilfield Company ， Xi ’ an 710018 ， China ； 3． School of Energy Resources ，China University of Geosciences ， Beijing 100083 ， China
  • Online:2016-05-20 Published:2016-05-20

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Abstract:

 The formation mechanism of reservoir in Ordos Basin is very complex. The study on reservoir characteristics and formation mechanism is an effective way to find high-quality reservoirs and cognize oil and gas distribution rule.Based on the analyses of casting sections, intrusive mercury curve and logging data, the features of physical properties,microscopic pore structure and intrusive mercury coefficient of Chang 6 reservoir in Jiyuan area were studied. In term of the evaluation of extra-low permeability reservoir, microscopic pore structure can reflect the reservoir quality more effectively. The intrusive mercury coefficient was introduced, which takes into account five factors, including porosity,maximum intake mercury saturation, median radius, displacement pressure and sorting coefficient. 136 rock samples of Chang 6 reservoir were selected to carry out the mercury injection experiment. According to the characteristics of intrusive mercury coefficient and intrusive mercury curve, the reservoirs are divided into four types which are highquality, good, moderate and poor reservoir. The experiment result shows that the larger the intrusive mercury coefficient is, the higher the well test yield in the corresponding zone will be, indicating a certain rationality of intrusive mercury coefficient for reservoir evaluation. The main controlling factors of Chang 6 reservoir in Jiyuan area include sedimentation, secondary dissolution and overpressure. It is suggested that the chlorite cementation zones, secondary pore zones and overpressure zones of subaqueous distributary sand bodies in delta front are the favorable belts for the development of high-quality reservoirs.

Key words: reservoir characteristics , formation mechanism , main controlling factors , intrusive mercury coefficient , Jiyuan area , Ordos Basin

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