The articie discusses the compiex probiems associated with the determination of the open porosity of rocks with extremeiy iow reservoir properties (for exampie, the Riphean Doiomites Krasnoyarsk Region) on core sampies, and borehoie geophysicai information. At the same time, examines the impact on the reiiabiiity of the resuits of the socaiied ciosed porosity of the examined sediments, particuiariy the interpretation of neutron method for the prediction of totai porosity and the possibiiity of using eiectricai resistivity to estimate the effective capacity.

   The paper presents existing approaches of the structural models buildings and the accuracy assessing of the maps. The importance of the correct building of structural maps for the oil fields was shown. The retrospective accuracy as­ sessing was done for three fields. It is shown that some values of accuracy given in the specification may not reflect the actual error of seismic models. The accuracy is confirmed with the formal assessments provided in the report in drilling in a region uniformly covered by the control wells. However, the error can increase considerably in drilling in the "external" parts. The error estimation, carried out considering the date of well-drilling, displays an insignificant modification of it's value with the time. The obtained results can be used in the risk assessments of drilling new wells, as specified in the work fields and deposits of analogues.

   This work about structure of the upper Jurassic deposits in the Tazo-Hetskaya facial area. Regional features of the structure of the upper Jurassic reservoirs in stratigraphic and facies criteria were determined during the work. The analysis indicates a complex structure, and as a consequence of the high geological risk of the upper Jurassic sedi­ments in the study area.

   The article presents the analysis of geological uncertainties associated with vasyugan deposits. In the process of drilling of a reservoir study identified geological problems, it was found that each deposit is characterized by distinctive geological feature, and each of them dominates your option of geological uncertainty. The main factor determining macro reservoir heterogeneity is the sedimentation process. The article reflects the relationship of existing geological problems with the sedimentary model.

   In 2015 the certificate on the state registration of the database and the computer program is received (the database of complex laboratory researches of a core CLICK + the program of control «The database of complex laboratory re­searches of a core CLICK»). The created system unites results of complex research of a core in a common informa­tion space, provides the authorized access to results of researches of a core, provides a possibility of storage, system­ atization, data processing, visualization, collection of statistics and unloading of data in required formats in necessary structure and amount.

   The work presents actual methods of production forecasting used in industry. Particular attention is devoted to the analysis of decline rates of oil production from production history and the approximation of the empirical decline rate by analytical functions. The concept of a corridor of decline rates is introduced. Approaches to the forecasting of the base production in the context of each well, including the displacement curves, are described. The ways of risk analy­sis in oil production forecasting are given.

   In this article, authors described the design of development of multilayer deposits by systems with horizontal multilat­eral wells and assessment of engineering feasibility at the concept stage. The concept of conformal bedding layers development of Eastern-Messoyakhskoye field allows to define cost-effec­tive development objects during exploitation of deposits with horizontal and multilateral wells with the use of multi­stage fracturing. Under the concept the ranking (prioritization) of layers were made prioritizing the development ob­jects and the secondary objects of addition. Considered various options for regular and non-regular development sys­tems with usage of analytical methods, sector modeling and full-scale simulation model. The development feasibility was evaluated of the horizontal well systems including multilateral wells and dual completion at each stage. The result of this work is implementation of the program research and determination of field regions of experimental program in cost effective areas in the development with both systems of horizontal wells and multilateral horizontal wells using the technology of dual completion. The project includes optimization of wells projected from well pads of main object PK1-3. Thanks to the approach described in the article, about 80% of the reserves at the secondary formations were involved into profitable development. These reserves before were estimated to be unprofitable. At the beginning of full-scale development or experimental program in the case of changes in the geological struc­ ture of the deposits, the proposed approach of determining cost-effective areas will allow you to adjust the strategy drilling of multilayer deposits without rebuilding a full-scale geological and simulation models. In addition, the results of analytical methods and sector modeling will allow finding the optimum in case of economic parameters changes, including capital costs for drilling wells.

   The paper describes informational content problems of long-term temperature surveillance by means of distributed temperature sensors (DTS) in horizontal producers. Field cases unreveal high informational potential of transient fiber-optic temperature surveys in wells with complicated completion. The authors work on possible quantitative methods of flow profile surveillance based on DTS surveys data.

   In the articie actuai probiems, the soiution of which is necessary to enhance the reliability of information on PVT prop­ erties of reservoir fiuids of oii and gas deposits, are discussed. The created in Gazpromneft NTC LLC scientific and methodoiogicai standard of PJSC Gazprom Neft "Sampiing and iaboratory studies of reservoir fiuids" is characterized. It is noted that the document accumuiates the Russian and woridwide experience. It is noted the necessity of creation in Russia a uniform reguiatory and methodoiogicai recommendations for sampiing and iaboratory studies of reser­ voir fiuids. It is important for improving the quaiity of the reserves caicuiation and designing of deposits deveiopment.

   This article describes the basics of modeling processes for the preparation of oil, gas and water. The article shows the need to take account of phase transitions in co-operation of oil treatment units and compressor stations (gas processing plant) oil and gas fields.

   This article is devoted to the maintenance of geological databases in Gazprom Neft. The work justifies the need to maintain the quality of data at a high level. The issue of the important role played by data in achieving the company's goals is touched upon. Attention is paid to a number of basic tasks, which are paramount in the work with information. The article describes the history of creating a geological database, the mechanisms of information movement and the results achieved in recent years.