Fine Reservoir Description Of Guan 3 Section In Qu 9-111 Block Of Linnan Slope

Qu9-111 block,which locates in the south of Qudi oil field,have several oil groups of which Ng3 is the main.Since the block was invested in developing,its production had been relatively low due to the poor technology and lacking of knowledge of the complex underground conditions.According to the theories of high resolution sequence stratigraphy,sedimentology,reservoir geology,development geology and reservoir description,adopting the means of stratigraphic subdivision contrast,micro structure study,sedimentary microfacies study and the technology of reservoir geologic model,guan 3 section in Qu9-111 block was described finely and its 3D reservoir model was built through computer.By the use of core data and log data,Ng3 parasequence sets was divided into 3 parasequence on the base of identifying the long-term and medium-term cycle interfaces,which was further divided into 12 single sand bodies by the means of “cycle-thickness correlation” and “isobaths time quautum contrast”.And subtle stratigraphic formwork in the study area was established.Seven 3-and 4-stage faults were recognized through interpreting seismic section and coherence technology according to seismic data.On this basis,several lower-order faults were further identified using a combination of well data and seismic data.Besides,the tiny structure was studied with the results of stratigraphic correlation and the fine structure model which is composed of faults and surfaces were built.Through investigating core data,synthesizes logging characteristic and the distribution regulation of the sandbody,the sedimentary facies of the guan 3 section in study area was discussed.Braided river is the major depositional system which concludes channel bar,channel filling,overbank and low-lying land among the channels.And the scale of the river showed a trend of decline from bottom to top.With the data of thin section analysis,SEM(scanning electron microscope)and in-house testing,the reservoir heterogeneity was studied in micro and macro.The results show that guan 3 section in Qu9-111 block belongs to high porosity and permeability reservoir and shows great heterogeneity.And the reservoir property of Ng33 is much better than which of Ng31 and Ng32.A variety of types of poors,which include fault reservoirs,lithologic reservoirs and fault-lithologic reservoirs,were recognized through the fine study on reservoirs.And the distribution features of oil were main controlled by lower-order faults,sedimentary microfacies and tiny structure of surface.With the strategy that combining stochastic modeling and deterministic modeling,3D geological model,which provides a reliable geological basis for readjustment of injection-production plan,was built adopting phased sequential Gaussian simulation by petrel software.