致密砂岩储层含水性预测方法——以临兴地区上、下石盒子组为例

Water content prediction method of tight sandstone reservoir: a case study of Upper & Lower Shihezi Formation of Linxing area

周龙刚 万欢 金力钻 王应斌 潘新志 张昊 张兵

中海油能源发展股份有限公司工程技术分公司，天津 300457 中海油研究总院有限责任公司，北京 100028 中联煤层气有限责任公司，北京 100016

CNOOC EnerTech-Drilling ＆ Production Co., Tianjin 300457, China CNOOC Research Institute Co., Ltd., Beijing 100028, China China United Coalbed Methane Corp., Ltd., Beijing 100016, China

鄂尔多斯盆地东缘临兴地区致密气藏气水分布复杂，储层含水性难以预测。文中通过饱和度、薄片鉴定、物性实验等研究，建立了从定性到定量的致密砂岩储层含水性预测方法。研究表明：地层水的赋存状态与砂岩孔隙类型、结构、泥质体积分数密切相关，且受水动力强弱的影响，据此建立了适合研究区的束缚水饱和度和可动水饱和度计算方法，开展了单井致密砂岩储层含水性评价，得出可动水饱和度大于8%的储层大多产水；分析了泊松比预测储层含水性的适用条件，平面上裂缝发育会影响预测结果；基于沉积微相￣物性￣含水饱和度的关系，建立了平面含水饱和度定量预测方法。预测结果可为致密气井部署、压裂改造、排水采气措施优选提供依据。

The distribution of gas and water in tight gas reservoir is complex in Linxing area, eastern margin of Ordos Basin, and the reservoir water content is hard to predict. Combined with saturation, thin section identification, physical property experimental analysis, a qualitative and quantitative water content prediction method for tight sandstone reservoirs is established. The study shows that the occurrence form of formation water is closely related to the pore type, structure and shale content of sandstone, and influenced by hydrodynamic intensity. Based on this, the calculation method of irreducible water and movable water saturation suitable for the study area is established, and the water content evaluation of single well tight sandstone reservoir is carried out. It is concluded that most reservoirs with mobile water saturation higher than 8% produce water. The applicability of water content prediction by Poisson′s ratio is analyzed, and the plane fracture development will affect the prediction results. Based on the relationship of sedimentary microfacies, physical property and water saturation, a quantitative prediction method of plane water saturation is established. The prediction results can provide a basis for tight gas well deployment, fracturing transformation and optimal selection of drainage and gas production measures.

10.6056/dkyqt202303004