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The Fine Description And Investigation On The1stMember Of Reservoir In Dongying Formation Of NanPu No1Structure

Posted on:2014-01-31Degree:MasterType:Thesis
Country:ChinaCandidate:Y H GuangFull Text:PDF
GTID:2250330401980617Subject:Institute of Geochemistry
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Nanpu depression lies in the north of huanghua subbasin in the west of Bohaiwan basin, depression area is1932km2. No.1structure of Nanpu oilfield is a typical complex fault block oil reservoir, small fault blocks, difficult stratigraphic correlation and variable transversal lithofacies. Reservoir sedimentary microfacies research is weak, Sand body genesis is not clear, which restrict the oil and water dynamic analysis in the process of development; Reservoir heterogeneity is serious, stratified period of reservoir heterogeneity research needs to be deeper.The comprehensive study of the1st member of the Dongying Formation comprehensive utilization of the reservoir petrology, structural geology and other related knowledge in the paper mainly made the following points:1、Comprehensive analysis consider the study area is braided river delta front subfacies deposition through the study of regional tectonic background study, core observation, log comprehensive interpretation, profile sedimentary microfacies classification and correlation. Braided river delta front subfacies mainly develops distributary channel, tributary bay, mouth bars, sheet sand, and distributary channel and mouth bar are the main reservoir sand body.2、Reservoir basic characteristic research shows that the main rock types for the1st member of the Dongying Formation is lithic arkose sandstone. River area mainly develops coarse sandstone and coarse medium-sandstone. Permeability always is130~271×10"3μm2, The average is210.7×10-3μm2; Fine sandstone, the most development sandstone in this area, can be found in braided river, channel mouth bar, Interchannel thin sand layer, and the permeability always is2.84~34.1×10-3μm2, the average is10.0×10-3μm. The permeability of the very fine sandy fine sandstone and siltstone, pelitic siltstone distributed in front sheet sand microfacies deposit always is0.82~3.43×10-3μm, the average is2.1×10-3μm. It reflects physical differences of different facies belt.3、The study of macroscopic heterogeneity in the1st member of the Dongying reservoir, especially the plane and interlayer heterogeneity shows reservoir heterogeneity is stronger overall, sand body distribution is controlled by sedimentary facies distribution and article geometry are more banded distribution from the north west to north east, thickness change is irregular, sand body connectivity along the source direction of sediment source is better, sand body connectivity in vertical direction of sediment source is poor. Property distribution in the plane of basic is consistent with sand body morphology, the property of just north area is is better than the north west.4、There are three reservoir categories in the study area. Contrast research indicates that Ⅲgroup oil reservoir quality is the worst, Ⅱ reservoir is most,Ⅲ reservoir is less, Ⅰ reservoir is least; Ⅱgroup oil reservoir quality is better, II reservoir is most, Ⅰreservoir is less, Ⅲreservoir is least; I group oil reservoir quality is best, Ⅰ reservoir is most, Ⅱ reservoir is less, Ⅲreservoir is least.5、Study area is a set of braided river delta front sedimentary with nearshore rapid accumulation. reservoir horizontal change fast, fault is complex, heterogeneity is strong.3D reservoir geological model is established through the modeling software Petrel on the basis of Integrated application of geology, seism, logging, production performance data and stochastic simulation method. The3D reservoir geological model include sand body skeleton model, facies model, structural model and property model.
Keywords/Search Tags:Nanpu Oilfield, sedimentary facies, reservoir heterogeneity, geologicmodeling
PDF Full Text Request
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