The Research On Evaluating Carbonate Fractured Reservior Of Amu Darya Right Bank Block

In order to settle the problem of evaluating Amu Darya Right Bank Block, this paper is based on the lithology, reserving space, type of fractures, characteristics of fractures to log response and fluid property of Callovian-Oxfordian carbonate rocks in Amu Darya basin, and conducts a research on a comprehensive well logging evaluation technique which fits for this research area.First of all, from the core and analysis-assay data, the paper does a research on lithologic identification of carbonate rocks. Together with core logging, imaging logging and conventional logging materials, a qualitative and semiquantitative discription of reserving space has been bulit in this block. The main lithology Callovian-Oxfordian carbonate rocks include bioclastic limestone, and dolomite, gyprock and argillaceous limestone also can be found in some parts. Pore, emposieu and fractures are the major reserving space here, while the type of reservior is most fracture-pore pattern.Secondly, with the core-graduated logging, imaging logging and conventional logging, the mode of fractures identification has been set up, following the differentiation of reservior type. The results show that the natural fracture and inductive fracture move from north-west to south-east and the maximum horizontal principle stress contributes to open the fracture in Callovian-Oxfordian formation.Under the basis of core analysis and fine interpretation on imaging logging, physical property and rock electrical property experiment materials, the paper makes a quantitative interpretation modle of porosity, permeability and gas saturation, as well as use dual lateral logging and imaging logging to build the fracture porosity and permeability modle. The minimum of resistivity is20Ω.m, the porosity is5%and gas saturation is60%in the gas pay.Lastly, from all the work referred above, this paper conducted the reservior evaluation with logging comprehensive research and built a division criterion of reservior ranks. According to this criterion, type Ⅰ、Ⅱ are fine reserviors, while type Ⅲ is potential and type Ⅳ is nonreservior.