Study On The Identification Method Of Geochemical Of Oil And Water Layer In A Block Of Jidong

The Nanpu depression in Eastern Hebei basin is located in the northern part of the Huanghua basin.It consists of three tectonic units,that is,the northern deep lying zone,the central anticline belt and the southern slope belt.It is one of the important areas for oil and gas exploration.The basin mainly controlled by fault reexamination of the oil and gas reservoirs,with fault block,small fault block,the longitudinal long oil-bearing reservoir,complex oil-water system,complex oil-water relationship,heterogeneous reservoir,which reservoir oil and gas reservoir evaluation is difficult.In view of this situation,researches on rock pyrolysis,rock pyrolysis gas chromatography and light hydrocarbon logging technology have been carried out.In recent years about the identification of oil gas water logging application effect prominent theory as the core,through in-depth research,innovation and perfection,the re establishment of Geochemistry of oil gas water layer identification method,is designed to provide new technology for the complex oil and gas reservoir evaluation of advanced and effective for oil exploration,improve the coincidence rate,to meet production needs.This paper analyzes the influence factors of reservoir fluid properties and production capacity,production volume estimate required variables and geochemical logging related parameters,namely oil,oil saturation,irreducible water saturation,irreducible oil saturation,embodied as porosity,oil content,oil density,oil viscosity.Therefore,under the same reservoir lithology and similar oil content,it is found that the most important variable affecting oil and water productivity is oil saturation.Through the theory of mechanism and oil saturation analysis,combined with the geological significance of rock pyrolysis parameters characteristics,select the effective parameters;using the gamma probability distribution function and rock pyrolysis gas chromatogram obtained form fitting,set parameters quantization.For light hydrocarbon data,the sensitive parameters which reflect the composition of oil,gas,water and hydrocarbon are selected from the theoretical mechanism research,namely dissolution mechanism,diffusion mechanism and dilution mechanism.Optimization of sensitive parameters by quantitative data interpretation and evaluationstandard and reflect the hydrocarbon oil gas water,combined with oil production test conclusion the establishment of oil gas water interpretation evaluation chart,the geochemistry of oil gas water layer identification and quantitative processing and accurate interpretation.The application shows that the coincidence rate of interpretation is over 80%,and the effect is better.At the same time,it can be used as reference for other oilfield to find suitable parameters and methods for reservoir fluid evaluation.