The Geological Modeling On Nanhua Area Fu 3 Reservoir In Qintong Sag

This paper relies on the project of sedimentary microfacies and reservoir geological modeling in the third member of the Nanhua block,and the Beihanzhuang oilfield as a research area,which comprehensively applies drilling,logging,oil testing and production dynamic data.The small layer is divided,and the sedimentary microfacies and sand body distribution are studied on the basis of small layers,and the three-dimensional geological model of the reservoir in the research area is established.The multi-stage and diversity of tectonic,sedimentary and diagenetic processes since the deposition of the Taizhou Formation in the depression have determined the multi-cyclone sedimentation of the sand-shale and the inter-layered oil-bearing characteristics of the reservoirs in the South China Area.The third part of the reservoir is used to carry out reservoir geological modeling and study the distribution law of the reservoir,which is of great significance for the next oil and gas exploration and development of the area.In view of the geological characteristics of the third member of the Nanhua area,several aspects have been studied:Based on the theory of sedimentary tectonics and sequence stratigraphy,the traditional gyration-thickness stratification method is combined with the actual data obtained from drilling to finely stratify the target horizon of the study area.Establish high-precision stratigraphic frameworks in the Nanhua area.Observing the core obtained by drilling,analyzing its lithology and sedimentary environment,obtaining the sedimentary microfacies characteristics of the well location,combined with the log shape,analyzing the distribution law of sedimentary microfacies,and establishing the sedimentary microfacies distribution of the whole study area.A basic understanding of the characteristics.According to the known drilling data of each layer,and by means of the secondary interpretation results of the well logging,the thickness of each small layer and the thickness of the sand body are counted,and the small layer thickness map and sand of the four main research horizons of III2,III4,III6 and IV5 are prepared.The body thickness map,in turn,gives the sand content distribution map of the four oil groups.Based on the observation results of the core,the sedimentary facies of the study area are divided.The results show that the sedimentary facies of the third member of the third member are relatively simple,mainly the sub-facies of shallow lakes.Based on the principle of phased modeling,the establishment of high-precisionreservoir parameter model is completed under the constraints of sedimentary facies model.Secondly,under the results of drilling sedimentary facies and secondary interpretation of logging,the stochastic simulation algorithm is used to establish the parameters of each layer by the composite phase-kriging modeling method,which is the porosity and permeability of the third section of the Nanhua block in the study area.And a three-dimensional model of oil saturation.The study finally achieved the following points:(1)The third section is divided into four small groups of four oil groups.The sand bodies of the I,III and IV oil groups are relatively developed,and the oil groups of the II oil group are mainly stable mudstone sections.The sedimentary facies of the target layer III2,III4,III6 and IV5 are relatively single,mainly the sub-facies of the shallow lake,and can be further divided into three kinds of microfacies: shallow lake sand beach,sand dam and shallow lake mud.The oil and gas reservoirs are mainly beaches and dam sands reconstructed by lake waves.The eastern side of the Nanhua area is adjacent to the delta front and is the main source of supply for the microfacies development of the beach dam in this area.(2)The distribution trend of porosity and permeability models is controlled by sedimentary facies.The favorable facies belt of Nanhua area is the shoal and dam microfacies.The high physical value area is near Nanhua 2-8,2-21 and Nanhua 1-4wells,mainly for beach and dam sand microfacies.(3)The phase-controlled stochastic simulation algorithm is used to establish the porosity and permeability model.The physical properties of each oil-bearing sand body are clarified,and the oil saturation model is established to obtain the spatial distribution of the reservoir.According to the analysis of the model,the structural model is reliable and consistent with the results of drilling,logging stratification and seismic interpretation.The reservoir property index reflects the reservoir property distribution direction and conforms to the geological understanding.After research,the oil and gas distribution in this area has the following characteristics: each small layer of oil and gas is mainly distributed in Nanhua 2-7 well to Nanhua 2-41 well in Nanhua2 well area,with the largest oil content;followed by Nanhua in Nanhua 1 well area.In the area of ? ? 1-4 wells,the oil-bearing area is second;in the longitudinal direction,the III and IV oil groups in the third member of the third section are the main oil-bearing layers,of which the oil-bearing area of the III4 small layer is the largest,the oil-bearing area of the IV5 and III6 is the second,and the oil-bearing area of ? ? the III2 is the smallest.The geological model of the third member of thereservoir has truly reproduced the geological characteristics of each reservoir in the study area,and has a more intuitive understanding of the three-dimensional spatial distribution characteristics of the reservoir's structure,sand body distribution and pore permeability.It provides a reliable geological and reservoir basis for the later exploration and development of the area.