The Geological Model Research On Guzhuang Area Fu 3 Reservoir In Qintong Sag

This paper,relied on the projiect-"Qintong Sag Shuaiduo-Maoshan Fu3 reservoir trap evaluation and reservoir description",as Guzhuang oilfield a case,Comprehensive application of drilling,logging,oil test and production of dynamic data for sequence stratigraphic division,Under the control of sequence,sedimentary microfacies,and sand body distribution study,analysis of hydrocarbon accumulation conditions and establish the reservoir three-dimensional geological model of study area.The sedimentary microfacies change greatly,the reservoirs are mostly thin and large in the plane,which is disadvantage to the further reservoir research and reservoir description.It is necessary to unify the small layer of each oil group because of the study area is broken and the fault is small.The main structure of the main oil-bearing sand layer in the oil group needs to be further implemented.In view of the geological characteristics of Fu three sections of Guzhuang District,this paper will study from the following aspects.By analyzing the core,color,lithofacies type,property changes of rocks in vertical direction and features of sedimentary facies sequence combination.Based on the principle of sequence stratigraphy and high-resolution sequence stratigraphy,the stratigraphic framework is established and improved,so that the stratigraphic division is more accurate and reliable.The rock type and the type of sedimentary microfacies of the working area are determined by observing the core of the core,and provide the basis for the study of the distribution regularity of the sedimentary microfacies.According to the relationship between the single well phase,the type of sedimentary microfacies and the logging curve,the logging modes of various microfacies are completed.By analyzing the physical properties of the reservoir and the thickness of the reservoir sand body,to complete the sedimentary microfacies of each layer in the study.Using the logging lithology data to calculate the sand content and sand body thickness data of the target layer to extract the seismic facies phase.It is recognized that it belongs to the delta front sediments,including underwater distributary channel,estuary sand dam,underwater embankment flooding,diversion bay,far sand dam,sandy sand and other microfacies in the study area.Study on characteristics of reservoir sandbody by then.The tectonic model is composed of stratigraphic model and fault model,which is based on seismic data or well data,combined with high-resolution sequence stratigraphic stratification and three-dimensional seismic structure interpretation.Then,Petrel software was used to study the geological modeling of fine reservoirs in the third member of Funing Formation in Guzhuang District,and to establish the reservoir geological model of Fu 3 section in Guzhuang area.Based on the principle of phasing modeling,the sedimentary facies model is established first,and the sedimentary facies model is used to constrain the establishment of high precision reservoir parameter model.Secondly,under the research results of drilling sedimentation,seismic analysis and so on,combined with logging data and stochastic simulation algorithm,Combined with logging data and stochastic simulation algorithm,the composite phase control-Kriging modeling method was used to establish the parameter model of each layer,which is the three-dimensional model of porosity,permeability and oil saturation in Fu 3 section of Guzhuang block in the study area.The study finally made the following points:Guzhuang area drilling layer to Fu three sections I oil group,the lower strata did not wear.Finally,this study made the following conclusions:(1)Fu 3 reservoir is divided into 4 oil groups,subdivided into 20 small layers.Among them,the sands are developed in ?,?,? oil groups;thethickness of sand is thick in ? oil group,about 30 m,and the ateral compartment mudstone are stable distributed;?,? oil group thickness of each single sand is medium,vary from 10 m to 20m;? group turns out to be stable mudstone.Drilling layer to Fu three sections I oil group and the lower strata did not wear in Guzhuang area.(2)Vertical evolution features of facies show that: from Fusan segment to Fusi segment,from shallow water to deep water,it changes from delta faices to lacustrine facies as forward-water-backward-accumulation.Among Fusan segment,it shows changes of shallow water to deep water from oil group ? to oil group ? as from backward-water-forward-accumulation to forward-water-backward-accumulation,and vertical evolution features of facies show that it develops from delta internal front edge to external edge,which means that it changes from underwater distributary channel microfacies to mouth bar and sheet sand microfacies.The change of deep water to shallow water from deep water to shallow water shows as forward-waterbackward-accumulation to backward-water-forward-accumulation,changing from sheet sand,mouth bar microfacies to underwater distributary facies channel microfacies.(3)The porosity and permeability models were established by using phased random simulation algorithm.The physical properties of each oil and gas sand body were clarified,and the oil saturation model was established to obtain the spatial distribution of reservoir.Based on the model analysis,the structural model is reliable,which is in good agreement with the results of drilling,logging stratification and seismic interpretation.The reservoir property model reflects the distribution of reservoir properties and is consistent with geological knowledge:Vertical,Fu three I,? oil group as the main oil layer which ?3,?5 small layer of oil is the largest area,and the oil-bearing area of ?1??2??1??2??3??4??6 is the second.The oil content area of ?1,?3,?5 is small;and the ?1,?2,?3 small layer of oil containing is the smallest area.The continuity of the ?3 and ?5 layers in the longitudinal zone is relatively poor.From the plane point of view,Shuaiduo area of the shuai 5 wells is the most enriched and extended to Shuai 4 well area,Shuai 5-20 well area followed by oil,oil and gas potential is huge;The oil and gas is mainly concentrated in Gu 1 well area and Gu 3 well area in Guzhuang area,and the oil and oil area is the least affected by tectonic influence.Reservoir geological model realistic rendered the geological characteristics of the reservoirsr in the study area.The reservoir structure,sands distribution,porosity and permeability and saturation properties of 3D spatial distribution all have a more intuitive representation.