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苏里格气田西区含水层大面积分布,储层气水关系复杂,气水层识别困难,生产井多数产水,严重影响气井正常生产及区块整体产能评价部署。以气藏储层基本地质特征为基础,分析储层四性关系,分别建立盒8段、山1段孔隙度、渗透率及含水饱和度参数解释模型并进行模型可靠性验证。进而采用试气交会图方法确定声波、电阻率等主要曲线下限及孔隙度、渗透率、含水饱和度等物性下限,形成苏里格气田西区盒8段和山1段主力储层气水层识别标准,其中气层下限为孔隙度≥5%,渗透率≥0.1×10~(-3)μm~2,含水饱和度≤50%,声波时差≥213μs/m,电阻率≥60Ω·m,密度≤2.56g/cm~3,泥质含量≤20%。将标准应用于后续开发井气水层识别并与试气成果对比分析,证实标准可靠。同时,针对不同生产阶段、不同生产特征气井提出了试气、试采、探液面测试、气液两相计量试验及生产特征分析5种气井产水、积液的排查方法,明确产水对气井生产的影响,形成产水井排查标准并对受不同程度影响的气井提出措施建议,为气井及区块开发评价提供参考。
The large aquifers in the western area of the Sulige gas field have complex distribution of gas and water, difficulties in identifying gas and water reservoirs, and most of the production wells produce water, seriously affecting the normal production of gas wells and evaluating the overall production capacity of the blocks. Based on the basic geologic characteristics of gas reservoirs, the relationship between reservoirs is analyzed, and the porosity, permeability and water saturation parameter interpretation models for Box 8 and Hill 1 are established and the model reliability is verified. Then the lower limit of acoustic wave and resistivity and other major curves and the lower limit of physical properties such as porosity, permeability and water saturation were determined by the gas cross-plot method to form the gas-water layer identification of the main reservoirs of Box 8 and Shan 1 in the western section of the Sulige Gas Field Standard, of which the lower limit of gas layer is porosity ≥5%, permeability ≥0.1 × 10 ~ (-3) μm ~ 2, water saturation≤50%, acoustic time difference ≥213μs / m, resistivity≥60Ω · m, ≤ 2.56g / cm ~ 3, mud content ≤ 20%. The standard applied to the subsequent development of well gas aquifer identification and comparison with the results of test gas, confirmed the standard is reliable. At the same time, aiming at gas wells with different production characteristics and different production characteristics, the methods for gas production, test production, test of liquid surface, gas-liquid two-phase measurement test and production characteristics were analyzed. The impact of gas well production, the formation of production well inspection standards and to varying degrees of impact on the gas wells proposed measures for the evaluation of gas wells and block development provide a reference.