Research On Geological Modeling Technology Of Complex Fault-block Reservoir In Qiu Ling Oil-field

Qiu Ling oil-field is a nearly east-west short axis anticline that is cutted by complex fault in the structure,which fault is developed and its distribution is complex,so Qiu Ling oil-field is a typical complex fault-block reservoir.Qiu Ling oil-field was found by wildcat Ling 3 wells in 1990 and developed in 1995,and so far it has been developed for more than20 years.At present,Qiu Ling oil-field has entered the super high water-cut stage,by the end of 2014,the comprehensive water cut of this oilfield is 87.13%.In addition,many times previous development and adjustment led to the difficulty of the understanding of remaining oil in current underground is increased,and the reservoir heterogeneity is serious.And the previous development can not meet the development needs of the next step,it is need to design a new development plan,and implement secondary development in Qiu Ling oilfield now.Therefore,the first priority is to carry out fine geological modeling research on Qiu Ling oilfield,and know clearly the complex cutting relation of the fault in Qiu Ling oilfield,and establish a fine reservoir geological model,It can provide a reliable geological basis for the remaining oil research and making development scheme for this oilfield.This paper focuses on fine geological modeling of the main purpose layers of Ling #2Sanjianfang group reservoir of Qiu Ling oilfield.Because of the development of the fault in the Ling #2 area,and this area has the characteristics of typical complex fault block reservoir,thus the establishment of fine structure modeling is the most critical.This paper according to the development of faults characteristics and the existing geological drilling and geological structure information of Ling#2 district of Sanjianfang formation in Qiu Ling oilfield,and find out the development and distribution rule of faults and the relationship between faults and each levels in the study area.According to the modeling process of complex fault block reservoir,establishing a fine structural model which meet the actual structural characteristics of the Qiu Ling oil field by using petrel software firstly.Then on the basis of structural modeling,according to the characteristics of the Ling #2 area of Sanjianfang group reservoir in the Qiu Ling oilfield,establishing the sedimentary facies,lithofacies,porosity and permeability model by choosing the appropriate modeling method respectively.Finally,using four kinds of model checking method to test geological model from different angles,such asthe probability distribution of consistency test,attribute profile correlation test,the vacuated well test,phase control and non phase control simulation test,the results proved that the geological model established in this study is accurate and reasonable,and it accord with the actual geological characteristics of the oilfield,and this geological model has important guiding significance for the further development of the Qiu Ling oil field.