Comprehensive Evaluation Of Fracture In Qingxi Oilfield And Its Influence On Development

Qingxi oil field belongs to ultra-low porosity and ultra-low permeability fractured reservoir.In this reservoir,the fracture has two functions.In addition to the space and infiltration channel of oil and gas reservoir,it also plays a direct role in the distribution of oil and gas reservoirs.The oil test data of 41 wells have proved that most of the oil-bearing strata and differential reservoirs are strata with high degree of fracture development,so the degree of fracture development is an important control factor for the distribution of oil and gas.The degree of fracture development is also closely related to fault,lithofacies,geostress and sedimentary factors.Therefore,this article on the basis of fully investigating the comprehensive evaluation method of fracture development characteristics,collated and analyzed some data and data of geology,core,analytical test,conventional logging,drilling and logging,oil test and imaging logging.Then studied the four nature of the reservoir and the normalization method are used to identify the lithology,and the imaging data are semi quantified.The fracture identification method suitable for the region is obtained,and the calculation model of the reservoir matrix parameters is further studied according to the fracture coefficient.Combined with seismic data,the fractured distribution maps of the small layers are made.And the influence of lithology especially dolomite,sedimentary facies and faults on the development of fracture and the effect of fracture development on the result of oil test are studied.Then combined with the production dynamics of the well,the influence of the opening,density and development of the fracture on the development is analyzed.Finally,the guiding suggestions for the subsequent development of the reservoir are put forward according to the previous research results.