Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (1): 39-45.doi: 10.3969/j.issn.1673-8926.2018.01.004

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Geochemistry of hydrocarbon source rocks of Chang 7 in Ganquan-Fuxian area,Ordos Basin

YUAN Yuan, DU Kefeng, GE Yunjin, WU Feng, SONG Jian   

  1. Research Institute of Shaanxi Yanchang Petroleum(Group) Co., Ltd., Xi'an 710069, China
  • Received:2017-08-10 Revised:2017-10-09 Online:2018-01-21 Published:2018-01-21

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Abstract: Ganquan-Fuxian area is a main enrichment area of tight oil in Yanchang Oilfield,Ordos Basin,however, the resource potential and enrichment law are unclear,and the exploitation risk is large. The data of cores and logging were used to study the distribution of Chang 7 source rocks,and the total organic carbon,pyrolysis,chloroform bitumen "A" and vitrinite reflectance(Roc)were analyzed to evaluate the hydrocarbon-generating potentials of Chang 7 source rocks. The results show that the organic matter is mainly of Ⅰ and Ⅱ 1 type and in a maturate oil generation stage,with great hydrocarbon-generating potential,which is determined to be relatively good source rocks. The thickness and organic matter abundance of Chang 7 source rocks are controlled by sedimentary environment. The Chang 7 source rocks are mainly distributed in northwestern deep to semi-deep lake sedimentary area near the center of the lake basin,with the thickness of 50-70 m,which can be the key area for the next tight oil exploration. The research result is helpful for guiding the evaluation of hydrocarbon geochemical characteristics and hydrocarbon generation potential and the prediction of favorable oil and gas areas.

Key words: geological knowledge database, multiple-point geostatistics, geological modeling, tight sandstone gas reservoir, Sulige Gas Field

CLC Number: 

  • TE122.1+13
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