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Research On Reservoir Heterogeneity Of Upper 3rd Member Of Shahe-jie Formation In Liu80 Block

Posted on:2012-04-23Degree:MasterType:Thesis
Country:ChinaCandidate:L GanFull Text:PDF
GTID:2210330338467850Subject:Oil and gas field development geology
Abstract/Summary:PDF Full Text Request
Located in Hebei Province, Liu80 Block belongs to complicated fault block reservoir, which is characterized by highly developing faults, complicated structures and obvious heterogeneity. Its operation time is short and reservoir characteristics are not well understood, so it is necessary to study its reservoir heterogeneity, recognize the oilfield geological character and set up the 3D geological model to provide reliable geological evidence for making exploitation and adjustment program.Based on previous research achievements, the study used cores of 20 oil and water wells and logging files and studied the reservoir heterogeneity. The research shows that delta front facies relatively develops in Liu 80 block and the layers are mainly composed of sunderwater distributary channel, sand sheet and mouth bar microfacies. In the studying area, the average porosity is 12.01% and average permeability is 9.9×10-3μm2, which belongs to low-porosity and super low- permeability reservoir with bad petrophysical property. The rocks are mainly feldspar fine sandstone; the pore type is mainly corroded pore, the distribution of the pore channel radium has little difference with different permeable rocks. However, the difference in distribution of the throat channel radium is large. The reservoir is poorly sorted and the micro-heterogeneity is strong. The sandbody develops in II oil group and is widely spreaded, and III oil group is pooer. The sandbody in I oil group is not developed, which is only distributed sporadically in sandstone dam of coast and shallow lake. We have summarized and calculated the permeability variation coefficient and other heterogeneity parameters. The results show that the intraformational and interlaminar heterogeneity is obvious, but the degree of reservoir heterogeneities varies in different areas. The faults are developed in Liu 80 block, which had divided the oil-bearing sandbody into many small parts. Since there are more pooroil formation and the horizontal connectivity is hamperd, the oil is not connected well and the small layer's oil-bearing area is not wide but quite different. As the burying depth increases, the petrophysical property becomes poorer because of compaction. In general, the II oil group is better than the III oil group. The affect of microfacies on reservoir petrophysical property is obvious: reservoir heterogeneity are both declining along with distributary channel, mouth bar and sand sheet, which are the key factors that affect the reservoir heterogeneity.The software Petrel is used to construct its three-dimensional structure model based on 3D seismic data interpretation and in combination with drilling, logging and stratigraphic correlation data. By use of facies-controlled-kriging reservoir parameters modeling software designed by our tutor and facies-controlled-kriging modeling technology, the reservoir parameters model is constructed under the constraints of sedimentary facies and fluid facies. The structure of the oilfield, heterogeneity properties are displayed, which have provided basis for the coming reservoir study such as precise reservoir numerical stimulation.On the base of reservoir heterogeneity study, the comprehensive reservoir evaluation was finished. And the reservoir in researching area were divided into three types, type I and II were with good physical properties and great potential for development. At the same time, in consideration with reserves abundance distribution rules, the prosperous exploitation area was reasonably predicted and then exploiting adjustment programs were proposed.
Keywords/Search Tags:reservoir heterogeneity, reservoir modeling, facies-controlled-kriging, comprehensive reservoir evaluation
PDF Full Text Request
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