Relationship between Chemical Characteristics of Formation Water and Natural Gas Accumulation within Shan 2 Member of Shanxi Formation in North Yulin Gas Field

MENG Wangcai; LI Yun; FU Guomin; LI Jin

Northwestern Geology > 2018 > 51(2): 203-208.

MENG Wangcai, LI Yun, FU Guomin, et al. Relationship between Chemical Characteristics of Formation Water and Natural Gas Accumulation within Shan 2 Member of Shanxi Formation in North Yulin Gas Field[J]. Northwestern Geology, 2018, 51(2): 203-208.

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Relationship between Chemical Characteristics of Formation Water and Natural Gas Accumulation within Shan 2 Member of Shanxi Formation in North Yulin Gas Field

1. Shaanxi Yanchang Petroleum(Group) Co. Ltd., Yan'an 716001, Shaanxi, China;
2. Earth Science & Resources College of Chang'an University, Xi'an 710054, Shaanxi, China

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Received Date: September 10, 2017
Revised Date: March 05, 2018
Available Online: July 28, 2022
Published Date: June 04, 2018

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Abstract

Based on the statistics and analysis of the testing results of formation water samples from the Shan 2 Member of Shanxi Formation in North Yulin, it's known that the formation water of destination layer is mainly acidic and the high mineralized, CaCl₂ water type, showing well closed condition of formation water. This formation water is located in the reductive block-stagnation hydrogeology condition, which is conducive to the accumulation and preservation of natural gas. The study of relationship between hydro chemical characteristics and natural gas reservoirs shows that it has a better correspondence with natural gas enrichment area among the total high mineralization degeree of the formation water, the distribution range of CaCl₂ type water, the low value area of rNa⁺/Cl^- (<0.5) and rMg²⁺/Ca²⁺ (<0.1), as well as the high value area of r(Cl^--Na⁺)/2Mg²⁺ (>10)l.

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Relationship between Chemical Characteristics of Formation Water and Natural Gas Accumulation within Shan 2 Member of Shanxi Formation in North Yulin Gas Field

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