Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (3): 45-54.doi: 10.12108/yxyqc.20190306

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Gas and water distribution and its controlling factors of Xiashihezi Formation in J58 well area,Hangjinqi area

DUAN Zhiyou1,2,3, LI Xianqing1,2, CHEN Chunfang3, MA Liyuan3, LUO Yuan3,4   

  1. 1. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology(Beijing), Beijing 100083, China;
    2. College of Geosciences and Surveying Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China;
    3. SINOPEC Research Institute of Petroleum Exploration and Production, Beijing 100083, China;
    4. School of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2018-12-09 Revised:2019-03-01 Online:2019-05-21 Published:2019-05-06

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Abstract: Xiashihezi Formation in J58 well area is a key section of tight sandstone gas exploration and development in Hangjinqi area. At present, the distribution of gas and water and its influencing factors are not clearly understood, which greatly restricts the effective development of natural gas. Based on the study of geological characteristics of the study area, through comprehensive analysis of logging data, gas test data and formation water chemistry of more than 30 wells in this area, the distribution law of gas and water and the main controlling factors in J58 well area were defined. The results show that the salinity of formation water in this area is 24 176-76 917 mg/L, and the formation water types are all CaCl2, which reflects that the formation water is well sealed and conducive to the accumulation and preservation of natural gas. Vertically, gas and water differentiation is not obvious, the continuity of gas and water layer is poor and most of them are coexisting gas and water zone, and the gas reservoir of He 1 member is more developed. In the plane, gas layers are concentrated in the channel sand bodies, while water layers are mainly located at the edge of sand bodies. The distribution of gas and water is mainly controlled by hydrocarbon generating intensity, sedimentary facies, effective sand body thickness and pebbly sandstone thickness. Gas reservoirs are mainly distributed in areas where hydrocarbon generation intensity is greater than 15×108 m3/km2. The closer the distance between reservoirs and hydrocarbon source rocks, the more developed the gas reservoirs are. Sedimentary facies, effective sand body thickness and pebbly sandstone thickness further control gas production and the distribution range of gas and water layers. The results of this study have a guiding role in determining the favorable target areas for natural gas in the study area.

Key words: tight sandstone gas, gas and water distribution, controlling factors, Xiashihezi Formation, Ordos Basin

CLC Number: 

  • TE132.2
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