Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (5): 1247-1260.doi: 10.13278/j.cnki.jjuese.20180210

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Vertical Characteristics and Genesis of Laumontite in Lower Combination of Yanchang Group in Wuqi-Zhidan Area

Wang Zhao1, Wang Guanmin1, Yang Qingyu2, Hu Jin1, He Wei2, Shi Xiaoming1, Zhang Jie1   

  1. 1. School of Geoscience, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
    2. Exploration Division of Petrochina Changqing Oilfield Company, Xi'an 710018, China
  • Received:2018-08-08 Published:2019-10-10
  • Supported by:
    Supported by National Natural Science Foundation of China (41572123)

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Abstract: Three reservoir groups are existed in the lower combination of the Yanchang Group in Wuqi-Zhidan area:Chang 8, Chang 9 and Chang 10. In the mid-western part of the study area, the oil and gas mainly originate from the source rocks of Chang 73;while in the eastern part of the study area, the oil is from the Chang 91 source rocks. The X-ray diffraction and microscope observations of 624 reservoir samples show that laumontite cement is commonly developed in the reservoir in the lower combination. The content of laumontite has obvious vertical regularity:it is the lowest in Chang 8 in the mid-western part of the study area, gradually increases downward,and commonly develops in Chang 10; in the eastern part of the study area, the content of laumontite is the lowest in Chang 91, gradually increases in the upper reservoir of Chang 8 and lower Chang 10, and reaches the maximum in Chang 10. This change of laumontite is closely related to the maturity of the organic matter and fluid released from the source rocks. Laumontite belongs to the aluminosilicate mineral formed in the early diagenetic stage under alkaline and low temperature. Under the action of the organic acids and CO2 released from the mature source rocks, different degrees of laumontite dissolutions occur from near to far. The closer to the source rocks in the vertical direction the formation is, the less the laumontite remains. This distribution regularity indicates the distance and range of hydrocarbon generation and expulsion from source rocks.

Key words: Ordos basin, Yanchang Formation, laumontite, source rocks

CLC Number: 

  • P587
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