Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (3): 52-65.doi: 10.3969/j.issn.1673-8926.2017.03.007

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Sedimentary facies and favorable reservoir prediction of Cretaceous Xiagou Formation K1g13 in Ya'erxia area, Jiuquan Basin

YUAN Bochao, XIAO Wenhua, WEI Haoyuan, WEI Deqiang   

  1. Research Institute of Exploration and Development, PetroChina Yumen Oilfield Company, Jiuquan 735019, Gansu, China
  • Received:2016-06-11 Revised:2016-09-08 Online:2017-05-21 Published:2017-05-21

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Abstract: The submember of the first member of Cretaceous Xiagou Formation (K1g13)is one of the main oilproducing intervals in Ya'erxia area, Jiuquan Basin. However, the understanding of its sedimentary facies and influencing factors and distribution of favorable reservoirs are unclear. Based on the data of core, well logging, oil production test, the sedimentary facies and favorable reservoir distribution of K1g13 in Ya'erxia area were discussed. The results show that fan delta-lacustrine and nearshore subaqueous fan-lacustrine sedimentary systems are mainly developed in K1g13, which can be further divided into eight types of subfacies and 16 types of microfacies, and the favorable reservoir distribution is controlled by sedimentary facies belt and dissolution zone. The subaqueous distributary channel and mouth bar are the main favorable sedimentary facies belts. The secondary dissolved pores are the main reservoir spaces, and their development is mainly controlled by the content of feldspar, debris and matrix, and burial depth. By superposing the dissolution zone and favorable microfacies on the structural map, the distribution of favorable reservoirs of K1g13 was predicted:east to well Yaxi 1-1 and well Yaxi 116, west to well Yaxi 115 and well Liu 10, south to well Yaxi 5, and north to well Yaxi 112.

Key words: reservoir characteristics, influencing factors, diagenesis, Yanchang Formation, Zhoujiawan area, Ordos Basin

CLC Number: 

  • TE122.2
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