Geologic Comprehensive Evaluation Of Well Block Changgu 1 In Chaluhe Fault Depression Of Yitong Basin

Changgu 1 is a wildcat well which was deployed to drill in Chaluhe fault depression of Yitong basin by Jilin Oil field company.The purpose is to look for deep gas accumulation,to carry out the development situation of the base rock in Chaluhe fault depression,and to implement the conditions of containing petroleum in Liangjia tectonic belt.According to the analysis of Chang Gul well reservoir formation conditions and main controlling factors,the mainly task is intended to find the reasons of failure in purpose layer,which can provide guidance for the further prospecting.On the basis of previous research,we conducted the sample analysis experiment for deep research from the basic geological conditions,source rock evaluation,evaluation of reservoir,caprock evaluation to analyze the reservoir formation conditions and main controlling factors.Firstly,by restoring structural evolution history of seismic profile of changgul,we analyzed the structure evolvement process;Secondly,Stratigraphic has been divided and contrasted by the use of synthetic seismic record,logging,lithology.Deep source rocks of Xinanpu sag was qualitatively evaluated;Quantitative evaluation results can tell us the amount of resources in the work area.In reservoir evaluation;we focused on the development of fracture,and give evaluation results refer to the relevant standard because of bad matrix properties of base rock and the development of fracture;We adjusted identification of base rocks,and evaluate resevior comprehensively based on recognizing type of diagenesis and reservoir space.Cap quality evaluation conducted from microscopic and macroscopic levels to analyze the sealing ability of caprock,and we studied time-space relationships between each reservoir formation factors.Comprehensive geological evaluation of single well included source,reservoir,trap,transport and insurance as well as the breakthrough point.In the process of research we have mastered many distinctive technical achievements:the organic matter abundance evaluation of Hydrocarbon source rocks,use chemical kinetic theory to quantitatively evaluate source rock,Volcano rock reservoir evaluation,and fracture evaluation and etc.Through analysis,we have concluded that lack of communication of oil source is the main reason which lead to fail in the purpose layer after researching.