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Tight Sandstone Reservoir Heterogeneity Research Of Permian In Sulige Gasfield

Posted on:2015-03-19Degree:MasterType:Thesis
Country:ChinaCandidate:C JingFull Text:PDF
GTID:2180330503455806Subject:Geology
Abstract/Summary:PDF Full Text Request
As an unconventional natural gas reservoirs, tight sandstone gas plays an increasingly important role in the field of natural gas exploration and development because of its abundant resources. This paper studies the work area located at Su 6 block in Sulige gas field, and the target layer which is S1-H8 member strata of the Permian mountain. Sulige gas field has a low porosity and a low permeability of the physical properties, and wide sand group、petrography、pore structure characteristics,and strong heterogeneity within the reservoir. Thesis mainly study on tight sandstone gas heterogeneity, and provide strong technical support on tight gas development.This paper mainly research from both macro and micro heterogeneity of the reservoir in two areas of the study area, the research goal from the macro layer of sedimentary facies distribution, determine S1-H8 segment mainly braided river and meandering river deposition and meticulous division of sedimentary microfacies, Then the reservoir sand body distribution of lithology, reservoir compartment of macroscopic heterogeneity evaluation; By the microscopic heterogeneity fromdiagenesis,pore structure, characteristic heterogeneity of reservoir properties to find effective reservoir distribution. On this basis, a comprehensive evaluation to determine reservoir parameters and reservoir types to be divided, and further study of reservoir heterogeneity and reservoir capacity links to the exploration and development of natural gas late in the study area provide a reliable basis.It is concluded in this paper that: ①Su 6 blocks sedimentary facies are mainly fluvial, H8 S and S1 is a meandering river deposition,H8 X is braided river deposition. The thesis is divided into seven kinds of sedimentary microfacies.②Su 6 block H8 X drilling under sand thickness greater than the H8 S and S1, 14 small layer of sand rock group the degree of heterogeneity:H8X22、H8X11、S111>H8X12、H8X21>S132、S122、H8S12>S131、S121、S112 、 H8S22 、 H8S21 、 H8S11 ③ Diagenesis study area mainly compaction, pressure solution,cementation,metasomatism,dissolution, S1-H8 in B diagenetic stage diagenetic stage; main pore types:H8X inter-segment cuttings dissolved pores and grains dissolved pore over H8 S and S1 segment development, has a better performance of reservoir; the pore structure is divided into four types.Overall, Hill H8 S and S1 segment reservoir properties are strong heterogeneity, under sub-paragraph H8 X weaker. ④ Reservoir heterogeneity through a comprehensive study to determine the comprehensive evaluation parameters and established evaluation criteria, the reservoir is divided into three categories,Ⅰtype reservoir layer for the purpose of high quality reservoir, Ⅱ type reservoir layer for the purpose of better reservoir layer,Ⅲ type reservoir is the worst purpose reservoir layer,Su 6 main reservoir class Ⅲ,Ⅱ andⅠtype reservoir.has little.⑤Reservoir heterogeneity and gas reservoirs in close contact: sedimentary microfacies of the gas reservoir capacity can play a role in controlling the distribution of the longitudinal plane of peace, lithology from sandstone—coarse sandstone—pebbly coarse sandstones,more coarse granularity,a high quartz content, well productivity is high; While the larger mainstream roared radius,smaller displacement pressure, the greater the porosity and permeability of the reservoir, the higher productivity; reservoir heterogeneity parameters poor porosity and poor permeability,bigger gas saturation and higher productivity. Description reservoir capacity and the degree of heterogeneity is a major factor in the difference Sulige gas enriched.
Keywords/Search Tags:Sulige, Tight sandstone, Macroscopic heterogeneity, Microscopic heterogeneity, Comprehensive evaluation
PDF Full Text Request
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