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The Advantageous Region Evaluation And Reservoir Characteristics Over Chang4+5 Formation In Heshui Area

Posted on:2012-09-02Degree:MasterType:Thesis
Country:ChinaCandidate:J GaoFull Text:PDF
GTID:2120330332493848Subject:Mineralogy, petrology, ore deposits
Abstract/Summary:PDF Full Text Request
This paper aims at the development of current status on low (super-low) permeable reservoirs and reservoir characteristics over chang4+5 formation in Heshui area in Changing oil field, based on observation of cores using various experimental methods (including casting sheet, electron scan microscope, high pressure mercury intrusion, relative permeability experiments, etc.). A comprehensive and systematic study focuses on sedimentary principle, reservoir property and micro-pore structure, also analyzes the mainly controlled factors to affect reservoir, evaluates systematically and predicts the advantageous region over chang4+5 formation in Heshui area, considering real production situation. The main conclusions in the thesis are as follow:1,Reservoir provenance in Chang4+5,chang3 and chang2 formations in study area are mainly from the southwest and a few of them are from the northeast; reservoir provenances in Yan10 and 9 formations come from the south; reservoir provenance in Yan8 formation exists in both of the south and north.2,Delta front parfacies is the main type of sedimentary facies in Yanchang formation in study area; in Yan10 reservoir, the main type is braided river parfacies, while delta plain parfacies mainly exists in both of Yan9 and Yan8 reservoirs.3,The main rock type of reservoir rocks in Chang4+5 and chang3 in study area is syrosem arkose; clay mineral is main of chlorite and glimmerton Syrosem arkose and feldspar lithic quartz-sandstone of reservoir rocks are both in Chang2, and Yan'an formation has syrosem arkose only; Clay mineral includes kaolinite,chlorite and glimmerton. Each reservoir rocks detrital component are all with quartz primarily and feldspar secondly.4. Relative permeability curve of reservoir rock shows neutral-slightly water wet in Clhang4+5 and chang3 formation; while the curve of Yan'an formation generally shows neutral-slightly water wet; couple of reservoir rocks show the property of slightly oil wet. The characteristics of relative permeability curve in reservoir rocks from good to bad is Yan9, chang2, chang3 and chang4+5 formations in the order.5. Rock properties, sedimentary and configuration will all influence the formation of oil reservoir in study area; the factors of gas aggregation level are sedimentary facies and distribution of sandbody, and reservoir rock characteristic and configuration.6. Chang4+5, chang31 and chang2 in study area generally contains more oil, which are good advantageous region; Chang3, Yan'an 10,9 and 8 have less oil, but they can become bright goals in future.
Keywords/Search Tags:Heshui area, Sedimentary fades, Reservoir characteristic, Advantageous Region prediction
PDF Full Text Request
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