Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (3): 54-62.doi: 10.12108/yxyqc.20210305

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Characteristics of formation water and its geological significance in Moxi-Gaoshiti area, north-central Sichuan Basin

SU Min1,2, WU Kangjun1,2, LI Zhijun1,2, ZENG Dongfang3, CHEN Ying1,2, LU Keliang1,2, ZHU Min1,2, GONG Yanxiu4   

  1. 1. School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;
    2. Key Laboratory of Exploration and Development of Complex Oil and Gas Fields in Chongqing, Chongqing 401331, China;
    3. Shixi Oil Field Operation Area, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    4. Central Sichuan Oil and Gas Field Research Institute, PetroChina Southwest Oil & Gas Field Company, Suining 629000, Sichuan, China
  • Received:2020-03-04 Revised:2020-08-17 Published:2021-06-03

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Abstract: The Moxi-Gaoshiti area is the main natural gas producing area in Sichuan Basin，but the study on the formation water characteristics and its geological significance with oil and gas is still weak. Based on the theory of hydrocarbon migration and accumulation，combined with the analysis of ion composition，chemical parameters，hydrogen-oxygen isotopes of formation water，the relationship between formation water characteristics and hydrocarbon accumulation was revealed. The results show that the formation water is mainly of CaCl2 type in Longwangmiao Formation，Changxing Formation，submember of Leikoupo Formation（Lei-11 submember）and Xujiahe Formation，while mainly of CaCl2，MgCl2 and Na2 SO4 type in the second member of Jialingjiang Formation（Jia-2 member）. The salinity of formation water in Lei-11 submember and Xujiahe Formation is high，followed by Longwangmiao Formation，and low in Jia-2 member and Changxing Formation. The sodium chlorine coefficient of formation water in the five production layers ranges from 0.3 to 0.8，and the magnesium calcium coefficient ranges from 0.1 to 0.5. The desulfurization coefficient of Jia-2 member is the largest（greater than 2）， the desulfurization coefficient of Longwangmiao Formation ranges from 0.2 to 0.5， and the desulfurization coefficient of Changxing Formation and Lei-11 submember is equivalent，ranging from 0.1 to 0.8，while the desulfurization coefficient of Xujiahe Formation is 0. The natural gas has good preservation conditions in the north-central Sichuan Basin. The formation sealing of Xujiahe Formation is the best，the rock-water interaction is strong， while the formation sealing of Jia-2 member is the worst， and the rock-water interaction is weak.

Key words: formation water, chemical characteristics, ion composition, hydrogen and oxygen isotopes, Moxi-Gaoshiti area

CLC Number: 

  • TE133+2
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