Oil & Gas Geology ›› 2006, Vol. 27 ›› Issue (6): 762-768.doi: 10.11743/ogg20060606

Previous Articles     Next Articles

Reservoiring features of Daniudi low-permeability gas field in Ordos basin and its exploration and development technologies

Hao Shumin, Hui Kuanyang, Li Liang   

  1. North China Company, SINOPEC, Zhengzhou, Henan 450006
  • Received:2006-10-17 Online:2006-12-25 Published:2012-01-16

Abstract:

The giant Daniudi gas field,located in the north of Ordos basin,is of a tight and low-permeability type.Its main gas-bearing horizons from bottom to top are the Taiyuan Formation of the Upper Carboniferous and Shanxi Formation and lower Shihezi Formation of the Lower Permian,forming a complete set of sedimentary sequences of marine tidal flat-paralic-delta-terrestrial braided channel.The sequences,with a thickness of 250 m to 280 m and a stable lateral distribution,are in a shape of a huge box,to which the commercial gas pools are confined due to a dual tight sealing of favorable lithophysics and anomalous pressure of the regional cap in the upper Shihezi Formation.Layered lithologic traps overlap with one another and hydrocarbon reservoiring in them is characterized by near-source and box-like traps.To solve the problems caused by lithologic trap,tight and low-permeability sand reservoirs,and low natural production of the field,core technologies,such as description and evaluation of stacked lithologic traps and seismic prediction of coal bed reservoirs,have been developed during the exploration and development of the Daniudi gas field.And corresponding technologies of quick drilling aiming at protecting gas reservoirs and large-scale fracturing intending to promote gas production of tight reservoirs have also been advanced.

Key words: Daniudi gas field, near-source box-type reservoiring mode, tight reservoir, lithologic trap, reservoir prediction, large-scale fracturing

CLC Number: