Font Size: a A A

Evaluation Method Study Of Tight Sandstone Oil And Gas Reservoir Of BlockⅠin Middle Zhungaer Basin

Posted on:2015-02-07Degree:MasterType:Thesis
Country:ChinaCandidate:S C DingFull Text:PDF
GTID:2180330503955680Subject:Geological Engineering
Abstract/Summary:PDF Full Text Request
In recent years, tight sandstone formation of blockⅠin middle Zhungaer basin is the main goal of oil and gas exploration for Shengli oilfield. Tight sandstone oil and gas formation of blockⅠmainly belongs to Jurassic Sangonghe formation, which is deep and is typical low porosity and permeability sandstone oil and gas reservoir. Compared with conventional sandstone oil and gas reservoirs, tight sandstone formation has obvious characteristics as following: firstly, formation lithology is complex, and the measurement results of electrical resistivity are affected by rock matrix and pore structure, which makes the difference in well logging response characteristics between oil(gas) formation and water formation become little and oil, gas and water formations are difficult to identify. Secondly, the diagenesis of formation is strong, the space structure of pores in formation is complex, the reservoir anisotropy is strong, the characteristics of porous flow are different from normal Darcy’s law and change greatly in different blocks, the relationship between porosity and permeability is complicated, therefore effective formation is difficult to identify and the boundaries of the oil-water and oil-dry formation are difficult to determine.In this thesis, based on the comprehensive analysis on existing well logging information, core sample analysis and well test data, the characteristics of tight sandstone oil and gas reservoir are analyzed, studies on the “four-property relationship” are strengthen, and computational model of formation parameters such as porosity, permeability and water saturation is established. By means of nuclear magnetic resonance and conventional well logging data, characteristics of pore structure in formation is analyzed, microscopic mean pore throat radius is calculated, and method to divide effective formation and evaluate formation quality is proposed. Multiple statistical analysis methods such as variance analysis, principal component analysis et al are combined organically, and several well logging interpreting methods are established for the identification of fluid property of formation. Research results are applied in the fine evaluation of more than 10 oil wells such as well Z2, ZH1 and S1 et al. integration coincidence rate of 87.3% is reached, and satisfactory application results are obtained.Method to evaluate quality of tight sandstone formation is established firstly in this thesis, and the accurate determination of oil formation types is realized. Meanwhile, well logging “sensitivity” parameters which reflect oil bearing property of formation are extracted by means of mathematical methods, and quantitative identification of fluid property of formation is realized using multi-parameters. The expected target of this research is reached, research results can provide technical support for the exploration and development of oil and gas, and it can also provide basis for the well logging evaluation of tight sandstone formation in other block of Zhungaer basin in the future.
Keywords/Search Tags:tight sandstone oil and gas formation, four-property relationship, fluid identification, formation evaluation
PDF Full Text Request
Related items