鄂尔多斯盆地红河油田延长组输导体系定量表征

输导体系控制红河油田油气运聚成藏，为了更为有效地研究鄂尔多斯盆地输导体系，基于地质、录井、测井及地震解释，系统分析红河油田延长组输导体系“断-砂”组合的匹配性。利用泥岩涂抹因子（SGR）及断层紧闭指数（I_FT）定量分析研究区断层输导性能，断层间不同的封堵特征体现了断层输导差异性。采用有效空间系数（C_m）及砂体输导系数（K_s），定量厘定主力输导层并分析其输导性能，砂体输导系数与油气显示的关系研究表明，K_s>2的砂体具有较好的输导性能。结合成藏关键时期及现今的油藏剖面解析，发现油气运聚区域与现今油藏分布基本吻合。研究认为，现今鄂尔多斯盆地镇泾区块红河油田储层在低孔低渗的背景下，成藏关键时期的“断-砂”输导体系是油气运聚的主要通道，部分区域存在油气沿裂缝垂向运移。

Quantitative characterization of migration system of Yanchang Formation in Honghe oilfield,Ordos Basin

Previous study shows that migration system is a major factor that controlled hydrocarbon migration and accumula-tion in Honghe oilfield in Ordos Basin.To better understand migration systems in the Yanchang Formation of this oilfield,we systematically analyzed the compatibility of the fault-sandbody assemblages in the field based on geological,mud logging and well logging,as well as seismic data of the area.A quantitative approach based on two indicators (the shale gouge ratio simplified as SGR and fault tightness index represented by I_FT) was employed to study the transport capacity of faults in the study area.The results indicate that differential sealing behaviors between faults represent the differences of fault transport capacity.The effective migration-space coefficient(C_m) and sand body transport coefficient(K_s) were used to identify the main carrier beds and quantitatively analyzed their transport capacity.Study on the relationship between sandbody transport coefficients and oil and gas shows in the area revealed that sandbodies with K_s>2 have better transport capacity.A comparison between reservoir profiles of the key reservoiring period and present shows a good match between the area of oil and gas migration and accumulation and the distribution of nowadays reservoirs.The study indicates that the fault-sandbody assemblages were the main migration systems during the key reservoiring period of the low-porosity and permeability field (Honghe).It also points out that vertical migration along fractures was also possible in certain locations of the area.