辽河凹陷西部东营组低电阻率油层成因分析与识别

Genesis Analysis and Identification of Low Resistivity Reservoirs in Dongying Formation in the West of Liaohe Sag

辽河凹陷西部东营组油层电阻率普遍偏低,一般低于8Ω·m,常常与邻近水层电阻率相近或者出现倒置,这种现象严重影响了测井识别精度。在研究区岩石物理实验资料和测井、试油等资料的基础上,综合分析了各地质因素与电阻率之间的关系,结果表明:影响研究区油层电阻率偏低的主要控制因素为砂泥岩薄互层;其次是储层不动水饱和度高,高不动水主要是由于储层岩性细、孔隙结构复杂和泥质含量高等3个因素综合引起,这3个因素单独对储层电阻率影响较小;而储层导电矿物含量、地层水矿化度和泥浆侵入对储层电阻率基本无影响。通过建立东营组Ⅱ主力油层厚度与电阻率的交会图,确定低阻油层厚度界限为0.8~2.7m,电阻率界限为2.5~5.6Ω·m,将低阻油层的界限应用到其他主力油层二次测井解释中,再结合试油结果 ,识别符合率达到80%以上。

Organic Rankine cycle （ORC）,an effective technology for low-grade and medium-grade energy re- covery recognized by domestic and foreign scholars ,can alleviate the contradiction between human and energy. ORC mainly consists of evaporator,expander,generator,condenser and working fluid pump.Researches on how to improve the efficiency of ORC system are carried out from various aspects.The research on working fluids mainly focuses on pure working fluid and mixed working fluid.For pure working fluid,its matching with the heat source is mainly studied ,and for mixed working fluid,the mixing ratio and pinch point temperature dif- ference are studied.Plate evaporator is ideal for the ORC system.A new type of condenser can provide better cooling effect and economy.The flow reduction caused by the corrosion of working fluid pump is a research priority,and it can be effectively solved by installing booster pump or using reciprocating pump.Expander is a key component of the system.The features of scroll expander make it best suited for small ORC systems,and screw expander is currently the most mature expander.There are still many problems in the current research on ORC system,for example ,most of the researches are theoretical and specific experimental researches are few,and there are too many researches on single component or single target and relatively few researches on the entire system.