The Research Of Redimentray Faces In B301Well Area

Biyang depression is one of typical oil-rich small depressions in the eastern China with area only about1000km2. Its gas resources are about3.6×108t and resource abundance is up to36×104t/km2. As of2012, the rate of proven resources is about70percent; while B301well area is located in southern steep slope zone in Biyang depression, and heterogeneity of the reservoir is strong. Further fine and potential exploration required for deep research of sedimentary facies and reservoir in three sections of Hetaoyuan Ⅲ-Ⅳ sand group. To this end, by the integrated use of theories and methods sedimentary petrology, logging geology, reservoir geology and reservoir seepage mechanics, collecting logging, logging, drilling and other information sheets, combined with experimental analysis, logging evaluation techniques, we carried out stratigraphic division secretion, the evolution of sedimentary facies distribution, reservoir evaluation and fine favorable reservoir prediction in three sections of Hetaoyuan group in B301well area.Integrated utilization of logging, core drilling and logging data determine the characteristics of different sedimentary facies and the response characteristics of well logs, established B301well area logging phase-geological phase transformation plates, and make clear single well sedimentary microfacies and recognition criteria. On this basis, combining with lithology observations results of three sections reservoir in the study area, with a small layer of contrast, single well facies analysis, sedimentary sand flat distribution and sand body section trend analysis, we regard core of hree sections Ⅲ, Ⅳ, Ⅴ, Ⅵ oil group in B301well area as the close-to-source steep slope fan delta deposition, and it mainly develop distributary channel, mouth bar, sheet sand, landslides and other sedimentary microfacies.Through core-logging-geology integrated interpretation research, read the value of the various layers of sandstone thickness. By the analysis of well constrained core of three sections Ⅲ-Ⅳ layers of oil sand thickness contour, we make clear B301area oil group, a small plane layer and single sand body distribution rules; combined log facies analysis and distribution of the thickness of the sand, tracking analysis is carried on the study area fan-delta system and its associated sedimentary system space. On sedimentary background of the work area, we carried on classification and recognition of reservoir flow units in key layers of single well, and divided into five categories flow unit types to determine the correlation between the different types of flow units and reservoir properties.Based on the above findings, we created related patterns in B301well area such as capacity and lithology, physical properties, electrical properties, sedimentary facies, mobile units, etc., and systematic analyze relationship among sedimentary facies, reservoir distribution and reservoir properties. By the well test analysis and production of dynamic analysis, we believe that sublacustrine fan skeletons and sand body distribution unit controls the position and size of the main reservoirand in B301well area, and there is obvious logarithm linear relationship between flow unit (FZI value) and the original capacity.Fzi value can be adjusted to optimize well placement, and has important guiding significance to promote exploration and development in B301well area.