石西油田流体分布规律及含油性评价

石西油田石炭系火山岩油藏流体分布在平面上具有明显规律，即由南向北原油性质逐渐变重。且不受构造的控制；地水的变化则东、西两块有别，西块为低矿化度水分布区，离子浓度增加梯度由南向北，东块为高矿化度水分布区，离子浓度增加梯度由西向东。综合研究认为，原油和地层水的运移或注入方向均由南向北；油藏中部断裂是分隔东西两侧地层水分布并进而影响油气产能的主要因素。

Evaluation of Fluid Distribution and Oil-bearing Properties in the Shixi Oil-field

The planar fluid distribution of Cardomifero us v olcani c reservoi rs i n the Shixi Oilfi eld show s a re-markable trend i. e crude oil becomes heavier from south to north and its properties are not contro liedby the structure. There is difference between the formation water in the eastern and western parts. Theformation water has a lower salinity in the western part with gradient of ion concentration increasingform south to north while ion has a higher salinity in the east with gradient of ion concentration increas-ing from west to south. Asynthetic study indicated that the migration or injection direction of formationwater and crude oils is from south to noth and faults in the central part of reservoirs separated the dstri-bution of formation water and faults into two parts, and then affected oil and gas productivity.