Logging Evaluation On Chang6Reservoir Of Yanchang Formation Of Ping52Well Area In Xingzichuan Oilfield

Xing zichuan oilfield is located in the territory of Ansai, shanbei slope in ordos basin, andbelongs to the gentle west dipping monoclinal structure, the main oil exploration andproduction serie of strata is the chang6reservoir in the upper triassic. Chang6reservoir is alithological reservoir which has the characteristics of complex lithology, low porosity, lowpermeability, complicated pore types and structure，and the response characteristics of oil andgas on the conventional logging curve is not clear. Logging evaluation is difficult.With the development of reservoir exploration of ordos basin, logging evaluationbecomes especially important, the result of evaluation affects the development of oil fielddirectly. The Study on the four property relationship is more important, only the connectionbetween lithology, electrical property, physical property and oiliness is found, the logginginterpretation models are established on the basis of study, and reservoir effective thicknessminimum standards is established, the oil in the reservoirs is good or bad can be made the rightinterpretation and evaluation.According to the characteristics of chang6reservoir, four property relationship isestablished by using data of drill core, well logging, oil testing and analysis test.On the basisof above, the main parameters affecting porosity and oil saturation are optimized to set up thelogging interpretation model of porosity and oil saturation by using the method of multivariateregression analysis. According to the practical application, the two models can be used forreservoir evaluation because of their high precision and good adaptability. Compared withAnsai and other adjacent area, the effective thickness minimum standards of chang6reservoiris similar to them. At last, based on the ordos basin Mesozoic sandstone reservoir classificationrating standard, the chang6reservoir is divided into four types of reservoir.