Based on regionalized variable theory, semivariograms of geo-statistics wereused to research the spatial variation of soil properties quantitatively. The results showed thatthe semivariogram of soil organic matter is ...Based on regionalized variable theory, semivariograms of geo-statistics wereused to research the spatial variation of soil properties quantitatively. The results showed thatthe semivariogram of soil organic matter is best described by spherical model, the best model forsemivariograms of soil total N and available K is exponential models and that of available P belongsto linear with sill model. Those soil properties have different spatial correlations respectively,the lag of organic matter is the highest and that of available P is the lowest, the spatialcorrelation of N and available K belongs to moderate degree. Spatial heterogeneities are differenttoo, the degree of organic matter and total N are higher, the degree of available K is in the nextplace and that of available P is the lowest. Influenced by the shape, topography and soil of thestudy area, all isotropies of available P are obvious in all directions while anisotropies of othersare manifested. According to the analytical results, supported by GIS, Kriging and IDW methods areapplied to describe and analyze the spatial distribution of soil properties. The results indicatethat soil organic matter, total N and available K are distributed regularly from northeast tosouthwest, while available P is distributed randomly.展开更多
德惠断陷致密气藏储集层埋藏深、纵向跨度大、孔喉连通性差,高密度完井体积压裂技术虽实现了效益开发,但存在不同井间压后产能效果差异性大,稳产时间短的难题。通过对已施工井优质储集层厚度、铺砂强度、裂缝复杂程度和水锁伤害等因素...德惠断陷致密气藏储集层埋藏深、纵向跨度大、孔喉连通性差,高密度完井体积压裂技术虽实现了效益开发,但存在不同井间压后产能效果差异性大,稳产时间短的难题。通过对已施工井优质储集层厚度、铺砂强度、裂缝复杂程度和水锁伤害等因素与产能关系的分析,明确影响单井产能的主控因素,形成差异性射孔+“三段式”先成缝后成网+多级暂堵转向、防水锁压裂液体系等一系列压裂技术对策。经现场DS80-2井试验,压后第二天见气,见气返排率3.8%,日产气8.5×104 m 3,无阻流量19.2×104 m 3,为同区块同厚度气藏产量最高,见气返排率最低井;较设计产能提产20%,降本19%,达到提产控投的目的,为实现致密气藏高效勘探、效益开发提供了技术支撑。展开更多
文摘Based on regionalized variable theory, semivariograms of geo-statistics wereused to research the spatial variation of soil properties quantitatively. The results showed thatthe semivariogram of soil organic matter is best described by spherical model, the best model forsemivariograms of soil total N and available K is exponential models and that of available P belongsto linear with sill model. Those soil properties have different spatial correlations respectively,the lag of organic matter is the highest and that of available P is the lowest, the spatialcorrelation of N and available K belongs to moderate degree. Spatial heterogeneities are differenttoo, the degree of organic matter and total N are higher, the degree of available K is in the nextplace and that of available P is the lowest. Influenced by the shape, topography and soil of thestudy area, all isotropies of available P are obvious in all directions while anisotropies of othersare manifested. According to the analytical results, supported by GIS, Kriging and IDW methods areapplied to describe and analyze the spatial distribution of soil properties. The results indicatethat soil organic matter, total N and available K are distributed regularly from northeast tosouthwest, while available P is distributed randomly.
文摘德惠断陷致密气藏储集层埋藏深、纵向跨度大、孔喉连通性差,高密度完井体积压裂技术虽实现了效益开发,但存在不同井间压后产能效果差异性大,稳产时间短的难题。通过对已施工井优质储集层厚度、铺砂强度、裂缝复杂程度和水锁伤害等因素与产能关系的分析,明确影响单井产能的主控因素,形成差异性射孔+“三段式”先成缝后成网+多级暂堵转向、防水锁压裂液体系等一系列压裂技术对策。经现场DS80-2井试验,压后第二天见气,见气返排率3.8%,日产气8.5×104 m 3,无阻流量19.2×104 m 3,为同区块同厚度气藏产量最高,见气返排率最低井;较设计产能提产20%,降本19%,达到提产控投的目的,为实现致密气藏高效勘探、效益开发提供了技术支撑。