泌阳凹陷王集油田Ⅲ断块油层特征及控制因素

The characteristics of pay zone of Ⅲ faulted block in Wangji Oilfield and its major controlling factors

目的探讨相带变化频繁、地表水作用活跃、存在多套油气系统和测井响应复杂的断块油层特征及其控制因素。方法从地质、测井及多参数判别等方面,对王集油田核桃园组核三段的高、低电阻率断块油层、高电阻率水层进行了综合分析与研究。结果断块区的油水分布受断层、沉积微相、储层性质、地层水等因素的共同控制,相对高电阻率油层主要分布于构造部位较高和封闭性较好的分流河道砂体中,低电阻率油层主要分布于分流河道砂体边缘部位或断层附近,高电阻率水层主要分布于断层附近。结论只有掌握了高、低电阻率油、水层的特征、成因及富集规律,才能比较准确地识别断块油层。

Aim In order to explore the characteristics of fault-block reservoir and its formation factors, where the facies were changed frequently, the action of surface water was active, there were a few of oil-water systems, well logging response was complex. Methods High and low resistivity fault-block reservoir, and high resistivity water layer were discussed and studied synthetically based on geology, well logging and multiparameter discriminance. Results The distribution of oil and water in fault-block field controlled by factors including fault, sedimentary micro-facies, reservoir property, and formation water. The reservoirs of relative high resistivity were preponderantlt located in the channels sand-body of relative high structural position and preferable closure. The low resistivity reservoir was in marginal sand-body of distributary channel and/or fault vicinity. The high resistivity water layer was preponderant in fault vicinity.Conclusion The fault-block reservoir can be aright identified when the characteristics, formation, and accumulation of high and low resistivity fault-block reservoir, and water layer were predominated.