摘要
陕北志丹油田长6_1~2油层共发育两套砂体:下部砂体发育常规高电阻率油层,长6_1~2上部砂体发育低电阻率油层。随着对长6_1~2低电阻率油层的认识不断深入和勘探开发,极大拓展了樊川区油田可采储量。通过对比分析大量测井资料及探井岩心资料,结合近期对长6_1~2上部砂体低电阻率油层的射孔二次压裂试采试验,证实了樊川油田长6_1~2上部低电阻率油层,电阻率值介于3~30Ω·m,甚至小于2.5Ω·m。通过对该区域低阻油层的成因机理的分析,认为储层岩石颗粒的相对变细和泥质含量的相对增高,束缚水饱和度增加是导致长6_1~2低电阻率油层形成的主要原因。根据地区资料,展开长6_1~2低电阻率油层在岩性、物性、含油性与电性之间互相联系的内在规律,建立四性关系解释图版,得出了该区的长6_1~2低电阻率油层测井识别标准,对该区域低电阻率油层测井解释也有重要指导意义。
Chang 61^2oil layer of Zhidan oil field in north Shanxi province has developed two layers of sand reservoir, the upper is low resistivity oil layer and the lower is normal resistivity oil layer. As the continuous further understanding and exploration and development of Chang 61^2 low resistivity oil layer, the recoverable reserves of oil filed in Fanchuan District will be greatly expanded. Though comparative analysis of logging data and exploratory core data, refer to the performation, secondary fracturing, well test and production test, the resistivity of Chang 61^2 upper low resistivity oil layer of Fanchuan oil field is proved to be between 3 Ω·m and 30 Ω·m, even less than 2.5 Ω·m. By analyzing the formation process of low resistivity oil layer, smaller rock particles, higher shale content and the increased restricted saturated water are the main causes of formation of low resistivity oil layer. Based on the local data, it has an important guiding significance for the well logging interpretation of low resistivity oil layer in north Shaanxi district to carry out the interrelation of lithology, physical properties, oil - bearing property and electrical property, and to develop the fourproperty relationship diagram, then to develop the electrical property identification specification of chang 61^2 low resistivityoil layer.
出处
《延安大学学报（自然科学版）》
2017年第2期47-51,共5页
Journal of Yan'an University：Natural Science Edition
关键词
志丹油田
低电阻率油层
测井识别
四性关系
Zhidan oil field
low resistivity oil layer
logging identification
four- property relationship
