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Evaluation Reservoir Characteristic Of Chang4+5and Chang6in LaoShan Oil Region Of MaJiahe Development Area

Posted on:2014-12-18Degree:MasterType:Thesis
Country:ChinaCandidate:Z XiaoFull Text:PDF
GTID:2250330425482920Subject:Mineral prospecting and exploration
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Ordos Basin is an important energy basin of China. The Yanchang formation of Triassic system in Shanbei region is a typical reservoir of rich oil and gas, and an important oil-bearing series for exploration and development.Chang4+5and Chang6oil-bearing series in Laoshan oil field of Majiahe are the mainly position for development. In order to improve the production capacity and adjust the development trends, comprehensive study on reservoir characteristics is needed in the research area, so as to provide important geological basis in the later exploration and development.In this paper, under the guidance of advanced theories such as petroleum geology, reservoir geology, sedimentology and so on, combined with a large number of logging and drilling, outcrop and analysis testing, through such methods of fieldwork observation, rock core observation, mercury injection experiment and so on, Chang4+5and Chang6reservoir have been carried on the comprehensive research. Using methods of Regional correlation marker layer, cycle of sedimentation, strata thickness, the oil field has been divided into several small oil-bearing series named Chang4+51,Chang4+52,Chang61~Change4, as the research area of Chang4+52and Chang61is the main oil section, also is the focus of this thesis research, so this field is divided into Chang4+52-1,Chang4+52-2,Chang61-1,and Chang61"2again.the research region Chang4+52and Chang61are Delta plain subfacies and Delta front subfacies deposition. Sedimentary microfacies mainly include distributary channel and distributary bay. River channel sand body is mainly in northeast to southwest distribution.Though well logging, thin section observation, mercury intrusion analysis datum, The main purpose study area Chang4+5and Chang6have been deeply studied in the impacts of petrology characteristics, diagenesis, pore structure characteristics, physical characteristics, and heterogeneity reservoirs are mainly military arkose, fine-grained feldspar sandstone partly main mineral composition is mainly feldspar, quartz partly mainly fine sand and secondly silt and medium sand with respect to grain size. Granular supported type and line contact between Granular, pore type and overgrowth are main cement type. The research area diagenesis mostly is compaction, pressolution, cementation, denudation, cataclasis and so on. The research area major pore type is corrosion intergranular pore, next is juvenile originintergranular pore and intragranular dissolved pore. It belongs to axial canal-thin throat andmicrobore-micro thin throat. By the core analysis data in the statistical results show thatreservoir physical property of Chang4+5is better than Chang6. By its poroperm model, highporoperm values distribution accordance with sandstone in the body of the beltdistribution.reservoir heterogeneity research indicates, reservoir heterogeneity of Chang4+5isbetter than Chang6.At last, according to the various parameters of the reservoir characteristics research,combined with The classification of the Ordos basin in the Mesozoic sandstone reservoirevaluation standard, the reservoir of Laoshan oil field has been classified evaluation. theresearch area of Chang4+5and Chang6member is classified into Ⅰ,Ⅱ,Ⅲ and Ⅳ.Theystand for good, preferable, bad and finely compact reservoir. The Ⅱ and Ⅲ reservoirdistributes large areas; The Ⅰ andⅣ reservoirs are less distribute in the area, so that reach aconclusion that Chang4+5and Chang6belong to extra low permeability and lowpermeability reservoir.
Keywords/Search Tags:Chang4+5~2、6~1member, Sedimentary facies, Reservoir characteristics, Reservoir evaluation
PDF Full Text Request
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