鄂尔多斯盆地大牛地气田上古生界储层特征

Upper Paleozoic Reservoir Characterist ics of DaniudiGas Field In Ordos Basin

(华北分公司勘探开发研究院)

Research Inst itute of Explorat ion
and Development, North China Company, SINOPEC,
Zhengzhou 450006, China   

Daniud iGas Field lies in the north of Y ishan S lope in
O rdo s Basin. Its m a inly gassy fo rm ations a re Carbon iferous
Ta iyuan Form ation, Perm ian Shanx i Form ation and Low er
Shihezi Form ation. It has three reservo ir sands: the barrier
bar o f Carboniferous Ta iyuan Form a tion, de lta-pla in
d istr ibu tary channe l sand o f Perm ian Shanx i Form a tion and
fluv ia l fac ies channe l sand of Lower Sh ihe zi Form ation. The
reservo ir sands are low porous, low perm eable and tight. The
characteristics of Lower Sh ihezi Form ation, Shanx i Fo rma tion
and Ta iyuan Form a tion are sam e basica lly. The porous
structures of the Low er Sh ihezi Form a tion and Taiyuan
Fo rm ation are bette r than Shanx iForm ation􀀁 s. There are four
types in the Upper Pa leo zo ic reservo ir. Reservo ir typeⅠ and
Ⅱ show am ore deve lopm en t in Low er Shihez i Fo rma tion and
Ta iyuan Form ation, and rese rvo ir type Ⅲ presents a m ore
developm ent in Shanx i Form ation. The reservo irs o f Low er
Shihezi Fo rm ation and Ta iyuan Fo rm ation a re better than
Shanx i Formations.