Application And Research Of Oil-gas Shows Evaluation And Geochemical Characteristics In Xihu Depression

Xihu depression is one of the most successful blocks in the exploration and development of East China Sea basin.According to previous research results,Xihu depression exist two stages of hydrocarbon generation and migration accumulation,It Leads to complicated oil and gas shows vertically and horizontally.Previously,as a result of simple logging technology,the characteristics of the reservoirs with different properties on the logging data is not very clear,which makes oil and gas shows interpretation with logging data difficult.lead to oil and gas show that there are certain blindness,explain interpretation coincidence rate is difficult to improve.In order to improve the level of Xihu depression logging in oil and gas shows explanation,recently,Xihu depression of geochemical logging is introduced new technology,has been carried out 10 Wells of geochemical logging operations.These Wells located in the xihu sag of the central anticline fold belt in southern and western slope belt PingBei structure area,basic drill in the xihu depression found that all of the reservoir types at present.This thesis will be logging interpretation of oil and gas shows in two steps,first of all,according to the oil and gas logging abnormal monitoring data of the divided into abnormal interval with oil&gas showing,and then according to the features of various logging data,the judgment to explain the nature of the oil and gas shows.In abnormal interval with oil&gas showing in the main oil&gas showing is divided according to the fluorescence,gas logging abnormal interval.Better properties,for the upper reservoir,reservoir formation pressure by C1 correction parameters or total quantity of gas reservoir and the background value multiples(10 times)as a standard;To deep reservoir burial depth,poor property,poor drillability,or there is high pressure formation fluid invasion,leading to a sharp rise in gas logging the background value of reservoir,we directly by measuring the absolute value of the full amount and the background value of the difference between the absolute value(>5%)the division of the oil and gas anomalies layer threshold value.In the oil and gas reservoir shows that the nature of the discriminant explained,according to the characteristics of light hydrocarbon of the xihu sag of oil and gas shows the xihu sag shows that the interpretation chart,light hydrocarbon oil and gas using pixar,plate and the interpretation chart to determine the combination of light hydrocarbon interpretation of Xihu depression of the types of pore fluid of oil and gas shows.The purpose of preparation of lighter hydrocarbon interpretation chart is explained to determine pixar,possesses the characteristics of gas reservoirs with high maturity of reservoir identification explain the problem.Using the predecessors' research results,this thesis on the causes of formation of oil and gas shows the characteristics of the Xihu depression in the analysis and explanation,think the Xihu depression of late hydrocarbon generation of migration to early formation of the reservoir reconstruction and the redistribution of oil and gas gathering is the main cause of Xihu depression of oil and gas shows characteristics.The application of research results of this thesis in Xihu depression,the Xihu depression shows that the coincidence rate of log interpretation of oil and gas,prove that the research results of this paper in the Xihu depression of the oil and gas shows that has higher application value in interpretation.