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Ordos Basin, Fanxue Region Dingbian Of The Upper Triassic Dingbian The Head Of The Reservoir Characteristics Of Yanchang Group Of Chang8

Posted on:2012-11-08Degree:MasterType:Thesis
Country:ChinaCandidate:X Z YanFull Text:PDF
GTID:2250330395478407Subject:Oil and Natural Gas Engineering
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Ordos basin is a multiple cyclic composite type basin, oil and gas geology resources are rich, has the very high oil and gas exploration and development value. FanXue district is located in the northern shaanxi ordos basin slope of the Midwest, is to extend the oilfield company in ordos basin in DingBian an important oil-producing areas, is also extend oilfield company so far the only YiDunJi get ready to oil region.The primary oil-bearing bed is Chang-8of Yanchang Formation in FanXue oil region.There is a set of lithology、Resistivity characteristics of stable oil shale formation obviously in Chang-7which overlying Chang-8of Yanchang Formation in FanXue oil region,the thickness in Chang-8of Yanchang Formation is between80-100meters. According to the sedimentary cycle divided Chang-8into Chang-81and Chang-82, with the formation distributing stability, and the features obvious.There are several gentle structure in Chang-8of Yanchang Formation. Under the background of the west in the east inclined, developed North east-south、south west of nasal shape of the low angle nose-like uplifts because of the difference formation compaction, the geologic structure is quite simple.The sedimentary facies is mainly the delta front mesh distributary channel and interchannel, and developing distributary channel、 interchannel、 estuary dam underwater natural and crevasse-splays microfacies, and distributary channel deposit controled the distribution cloth and development of the reservoir in Chang-8of Yanchang Formation.The reservoir in Chang-8of Yanchang Formation were eveloped, Single layer thickness is smaller,and heterogeneity was higher. Core analysis of test pit in Chang-8of Yanchang Formation shows that in region the sandstone rock type are mainly debris feldspar sandstone feldspar lithic snastone. Sandstone clastic particle size is to0.15-0.25mm in common, and mainly fine-grained structure; Sorting characteristics were overall medium-better; clastic particles is mainly subangular, textural maturity is medium-poorer; pore type is residual original intergranular pore、erosion intergranular pores、dissolution pores between grains、 authigenic mineral intercrystal pore; Cementation type is pore and Basal-pore; Among them, carbonaterock even crystal type cementation is the main reasons of poor reservoir properties in Yanchang Formation;Accounting for41.2%of the overall is feldspar debris, quartz accounted for about31.0%, Interstitial content general between25%to35%FanXue oil region Chang-8reservoir groups reservoir diagenesis type more, diagenesis relatively intense, mainly has cementation, compaction effect, account function, dissolve role as well as the pressure dissolve role.Research shows that the area of Chang-8, deferred Yanchang Formation Chang-8reservoir development group mainly affected by the sedimentary facies, reservoir porosity and permeability of the development conditions, heterogeneity and the influence of the diagenesis. Delta plain mesh river distributary channel control the reservoir of exhibition cloth, reservoir development thickness, reservoir physical properties and pore throat structure is heterogeneity and diagenesis, the influence of porosity, permeability of reservoir determined the oil performance. Chang-8of Yanchang Formation Ⅱb group of delay and reservoir average9.1%, Ⅱb kind of reservoir and average31.6%,Ⅲa kind of reservoir is59.3, and the overall evaluation for low permeability of reservoir pore throat thick type. Sandbody mainly is for Ⅲ a kind, ultra-low reservoirs pores micro-fine throat type.
Keywords/Search Tags:Ordos Basin, FanXue oil area, Yanchang Chang-8, Sedimentary facies, Reservoir Characteristics
PDF Full Text Request
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