3rd EAGE International GeoBaikal conference 2014 - Exploration and Field Development in East Siberia

Комплексная интерпретация сейсмических и геоэлектрических разрезов осуществляется на основе двух основополагающих принципов(принцип выделения СВК и принцип системности) путем формирования многопараметровой физико-геологической модели, объединяющей геологические характеристики нефтегазоносного объекта и характеристики волнового и геоэлектрического полей, которые отображают изменения емкостных свойств горизонтов-коллекторов.

Probable correlation between seismicity, seismotectonic deformation field and deep velocity structure of the crust and the upper mantle of Central Asia has been investigated. For these purposes a 3D model of shear wave (S-wave) velocity distribution up to the depth of 700 km has been calculated and the STD state of the crust has been determined from focal mechanisms of strong earthquakes.

The proposed report deals with practicability of detecting hydrogen when conducting mud logging of constantly circulating drilling fluid. The significance of the issue under consideration lies in the possibility to improve the effectiveness of geochemical investigations when detecting and predicting the fluid content in reservoirs during the drilling process.

The data presented in the report are the actual results of investigations conducted in gas fields in Eastern Siberia.

The Main objective of oil industry worldwide is determination of accurate reservoir model. These models make an increased percentage of the world’s hydrocarbon reserves. The model requires complete information of subsurface properties such as porosity, permeability, etc. But the fundamental challenges for geologists and geophysicists to predict these properties are reservoir specificity and heterogeneity which affects reservoir performance and their well productivity. Moreover, nonlinear multivariable regression technique like Probabilistic Neural Network has been utilizes to correlate statistically the seismic attribute to achieve high correlation coefficients when cross-plotted with reservoir properties. It results in better (r2 = 0.82) correlation coefficient than linear regression model showed (r2= 0.74). The Issue is better seismic-well tie to generate synthetic seismic traces and their correlation between predicted and the true seismic trace. Therefore, we can propose to generate pseudo porosity log from the 3-D seismic volume using polynomial neural network, helps in better integration between seismic attribute and well logs to improve the reservoir characterization by providing petrophysical properties away from well controls. The proposed model tries to achieve high attribute correlation which improves the reservoir characterization lead in estimating hydrocarbon reserves. This model also assists oil and gas companies to obtain higher drilling success.

Fields located in Eastern Siberia, characterized by poorly examined and wildely separated from areas with developed infrastructure, which leads to the creation of the difficulties with studying the field and make decisions on investment project/ The report is based on information of Chonskoe project which includes a group of oil field - Vakunaiskoe, Tympuchikanskoe and Ignyalinskoe. A feature of these fields is many formations in reservoirs that includes 5 to 7 development objects in the sequence, as well as large number of faults that makes deposits in block-closed system with separate unrelated oil-bearing formations. In the most cases the decisive factor in the assesing the design development and exploitation becomes production forecastiong and methodology to the calculation of the profiles of oil. In this regard, the author carried out a comparison of different methods of calculating production profiles and justification appropriate calculation methods for deposits Chonskoy group. As well, the report discusses the geological features and account these features when calculating the oil production. In particular, the limited information appear uncertainty and associated risks. Thus, the ranking was done on the starting block and the degree of scrutiny miscalculation production profile for the whole project.

Osinsky formation composed mainly of dolomite and limestone, is one of the main horizons of the Lena- Tunguska petroleum province. Horizon is regionally distributed. Productivity of horizon proved within Talakanskoe, Verkhnechonskoe, Markovskoe, Sobinskoye, Vakunayskoe and other fields. Despite the almost universal regional distribution of these deposits, production rates of wells are highly variable (0 to 500–700 tons per day), are controlled by many factors. The authors have studied the structure Osinsky horizon , more details - within Verkhnechonskoe field. Analysis of geological and geophysical data has allowed to specify the factors influencing productivity, create a model of secondary transformations of rocks . For the first time these deposits on the basis of 3D seismic and drilling of deep wells are highlighted in the most promising areas of development zones collectors estimated volumes productive intervals. Realized technique can be applied with the purpose of forecasting perspective zones at other fields.

The paper discusses capabilities of the NMR method for the rock pore structure and surface properties research and indication during substitution of saturating fluids and corresponding core wettability changes. Regarding the issue all the experiments conducted on the cores at “as-received”, fully saturated and oilaged states. Additionally we performed analyses at partially saturated states after centrifugation and at the intermediate stages of the oil-aging.

For acceptance project solutions of test operation at insufficient geological study Yuzhno-Tabaganskogo and Solonovsky oil fields, results are attracted from development similar collectors of the neighbourhood fields in this work. In August, 2013 “LLC Gazpromneft East” granted license for geological study, explore and production of hydrocarbonic raw materials Yuzhno-Pudinskogo license site in which borders considered oil fields. Geological, physical and trade data on Yuzhno-Tabaganskomu and Solonovsky fields contains a minimum of data, but available data testify that the parameters of reservoir properties received in various ways (core samples, geophysical methods, pressure transient analysis). Data are difficult comparable because of a fragmentariness of researches. The part of parameters is accepted conditionally or by analogy. Therefore, except development of technological decisions for producing test implementation of the extensive program of research works, including on additional exploration of fields for the purpose of specification of geological models of productive layers and deposits and preparation field for industrial development is provided.

The method of compatibility determination of reservoir water interaction with highly mineralized displacement solutions was devised; laboratory studies on the selection of polymer type, its optimal concentration in displacement solutions to be able to maintain its rheological properties and increase the ORF at low reservoir temperatures and high mineralization of reservoir fluids were conducted. Based on the evaluation factors those determine the direction and speed of the processes occurring at the interface between solid and liquid phases, theoretical substantiation for choice of solvent to remove organic deposits formed on the surfaces of the technological equipment in the process of oil production in the extreme conditions of the North was obtained.