Chemical characteristics of the formation water in Hangjinqi area and their petroleum and gas geological significance

doi:10.7523/j.issn.2095-6134.2016.04.013

Abstract

Abstract:

The relationship between chemical characteristic of formation water and preservation of gas reservoir has been discussed based on analysis of the chemical composition in Hangjinqi area.The vertical and plane variations in chemical characteristic parameters in Hangjinqi area in the north of Ordos basin.The results show that most of these formation waters with low pH value and high total dissolved solid(TDS) are calcium chloride Ⅳ-type and Ⅴ-type waters.The plane distribution features show west-east differentiation and north-south dissimilitude.The high TDS and (r_Cl^－－r_Na⁺)/r_Mg²⁺ values and the low r_Na⁺/r_Cl^－,(100×r_SO₄^2－/r_Cl^－),and (r_HCO₃^－+r_CO₃^2－)/r_Ca²⁺ values in the west and local area of Boerjianghaizi fault indicate better sealing condition.The relatively positive correlation of the TDS and ion concentration with depth in the north and south of the Boerjianghaizi faulted zone indicates that the formation water exists in a closed fluid dynamic environment,which is beneficial to preservation of the natural gas.All the formation water-indicative sealed environments have natural gas discoveries, which indicates a good correlation between them.The water chemical characteristics provide clues to the natural gas prospects.

Key words: formation water, chemical characteristics, sealing condition, Hangjinqi area

CLC Number:

TE133.2

YANG Yamin, ZHAO Guiping, LI Liang. Chemical characteristics of the formation water in Hangjinqi area and their petroleum and gas geological significance[J]. , 2016, 33(4): 519-527.

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