Distribution of Formation Water in Yanchi County Block, Western Sulige Gas Field

The distribution of gas and water in the Yanchi County area of Yanchi West District of Sulige gas field is complex, and the chemical characteristics of formation water and its geological significance in natural gas production lack of systematic research, in order to make clear the difference of the chemical characteristic parameters of the target layer in the work area, the ion composition and salinity of the formation water in Shihezi 8 and Shan 1shan 2 of Yanchi block are studied, pH value and chemical characteristic parameters were studied systematically. The results show that Na , K and Ca2 are the most abundant cations in the target formation water of the Yanchi County block in the western Sulige gas field, accounting for more than 90% of the cations. Its anions are mainly Cl^-, HCO₃^- , SO₄^2-. The water type is the standard calcium chloride type. The PH value of the target layer was in the range of 6 - 7.35, being weak acid-neutral The sodium chloride coefficient, modification coefficient and desulphurization coefficient showed that the alkali exchange index (Ibe) of the target layer with good sealing condition was concentrated in the range of 0.5 - 0.7, and the average value was 0.63, it shows that the gas-bearing property of the target layer is good.