Evaluation Of Oil And Gas Resources Of Funing Formation In Gaoyou Depression

Many rounds of oil and gas resource evaluation have been carried out in the early stage of oil and gas resource evaluation in northern Jiangsu basin,but there are still some problems:the comprehensive evaluation of Funing formation in Gaoyou depression is not much;the potential of hydrocarbon generation and drainage of source rock is restricted by no stratification;the resource potential of main source rock is not evaluated;and the latest seismic interpretation data are not applied.In order to solve the above problems,this paper applies the basin simulation method,and carries out the Monte Carlo risk assessment to evaluate the potential of oil and gas resources in this area.In accordance with the actual geological conditions,the basic geological parameters,thermodynamic parameters,geochemistry parameters of source rock and hydrocarbon discharge parameters needed for reasonable selection of basin model are established,and the three-dimensional model of Gaoyou depression is established,and the relevant drawings are drawn.By using Basin Simulation Method,the hydrocarbon emission of two main source rocks in four sections of Funing formation and two sections of Funing formation in different critical periods was calculated.According to the results of the evaluation of source rocks,the amount of hydrocarbon generation and discharge in each horizon source rock is determined,and the uncertainty factors in the simulation process are evaluated by Monte Carlo method,and the simulated results of hydrocarbon discharge are investigated by probability distribution,which reflects the risk upper and lower limits of exploration prospect.The accumulation coefficient of each zone is obtained by reasonable analogy,and the oil and gas resources of Funing formation in Gaoyou depression are predicted by combining the characteristics of hydrocarbon generation and drainage.The results show that the total hydrocarbon yield of the two main source rocks in Gaoyou sag is about 10.621×10~8tons,the oil yield is 9.003×10~8tons,and the gas yield is 3243.4×10~8m~3.The hydrocarbon generation of Fu4 section accounts for 60.8%of the total hydrocarbon generation,the hydrocarbon generation is 6.458×10~8tons,and the hydrocarbon generation of Fu4 section is 4.163×10~8tons.The total discharge capacity of the two main source rocks in the study area is about 4.378×10~8tons,the total discharge capacity is 384 million tons,and the average oil discharge efficiency is42.7%,of which the discharge capacity of the fourth section of Fu is 1.69×10~8tons,the discharge capacity of the second section of Fu is 2.15×10~8tons,and the total discharge capacity is 1069.25×10~8m~3,the average exhaust efficiency is 33%.The total oil and gas resources of Funing Formation in Gaoyou Sag are estimated to be 3.23×10~8tons.The amount of oil and gas resources in the fourth section of Fu is about 1.429×10~8tons,and the second section of Fu is about 1.801×10~8tons,which are the main producing reservoir.Compared with previous studies,this paper uses the latest basin simulation software,the latest data to solve the problem of hydrocarbon generation and emission potential of the main source rocks of Funing formation,and to predict the oil and gas geological reserves of each oil-bearing structure;to analyze the uncertainty parameters and verify the probability distribution of the simulation results to ensure the rationality of the conclusion.This study has certain reference value and guiding significance for clarifying the next exploration direction and reasonably deploying and developing well position.