Microscopic Features And Oiliness Evaluation Of Glutenite Reservoir In Deep Zone Of Yanjia Area

Yanjia area is situated at the northern steep slope belt of Dongying Sag. Glutenite body is developed in Yan 16 and Yan 18 corrasional gully. At similar tectonic setting and oil sources condition, the oiliness is in a large difference between them. The key factor which cause the difference is glutenite reservoirs are different. Microscopic features of glutenite reservoir are the key factor which lead to different deliverability and producing method. Microscopic features of deep zone glutenite reservoir, master control elements of physical property and their affects on oiliness are the difficult part of reservoir evaluation.The following researches were studied in this paper:Microscopic features research:make use of drill core observation and case slice, scanning electronic microscope(SEM) and other analysis or testing data, study on deep zone glutenite reservoir's component, composition, pore type, pore structure, clay mineral, adglutinate microscopic features and their distribution.Reservoir physical property master control element research:study on control actions to physical property of deep zone glutenite reservoir by diagenesis, sedimentary facies and structural fracture these three elements.Oiliness evaluation: based on microscopic features, make comprehensive research on testing deliverability and mud-logging data characterization of deep zone glutenite reservoir.There are many research harvest and innovations:The differences of glutenite microscopic features between Yan 16 and Yan 18 gully were summarized.Reservoir diagenesis period is decentralized, master control elements of physical property were ascertained in Yanjia area. Initially draw up low-porosity low-permeability reservoir classification, homologous pore structure features of Yanjia area.Establish qualitative and quantitative criterion of different deliverability.By research on microscopic features, master control element of physical property and deliverability evaluation, these conclusions were obtained:The physical property of Yan 16 gully is obviously better than Yan 18. Reservoir types of Yan 16 gully are mainly typeâ… and typeâ…¡, that of Yan 18 is mainly typeâ…¢and typeâ…£.Carbonate content of Yan 18 gully is higher than Yan 16 gully.Major pore type of deep zone glutenite reservoir in Yanjia area is corrode intergranular pore. Major pore assemnle type is assemblage of paste-gravelaperture corrode intergranular pore.Diagenetic periods of deep zone glutenite reservoir in Yanjia area are late diagenetic period A and B, dividing line between them is about 4000m.Carbonate cementation and dissolution are master contorl elements to reservoir physical property in Yanjia area. Porosity and permeability is obviously decrease when carbonatite content exceed 12%.Pore structure is a significant element affect on deliverability. Nuclear magnetic resonance(NMR) T2 spectrum and pore structure picture can qualitative and semi-quantitative evaluate deliverability.