Determination of lithologic belonging and reservoir properties of clastic formations using field geophysical survey data of Baklanovskoe field

• Main Author: Vladimir N. Koskov
• Format: Article
• Language: English
• Published: Perm National Research Polytechnic University 2017-03-01
• Series: Perm Journal of Petroleum and Mining Engineering
• Subjects: well logging; core; lithology; reservoir properties; fractional composition; pore space structure; regression equation; correlation relationships; systematic approach; gamma-ray log; physical properties; geological heterogeneity; histograms; radioactivity; lithologic series; formation-reservoir
• Online Access: http://vestnik.pstu.ru/get/_res/fs/file2.pdf/6434/Determination+of+lithologic+belonging+and+reservoir+properties+of+clastic+formations+using+field+geophysical+survey+data+of+Baklanovskoe+fieldfile2.pdf

The paper contains results of comprehensive studies of well logging data and laboratory study of the core. Studies were carried out to determine lithologic composition and reservoir properties of clastic formations of Baklanovskoe field. It is noted that grains that compose clastic rocks are diversified in size, shape, degree of roundness and sorting, granulometric and mineral composition, type and composition of cement, its structure and ratio with grains. It is stated that these features of rocks determine structure of pore space, as an ordered set of mutual relations of elements of different hierarchical levels (for example, mineral grains, samples and rock formations). It is noted that study of pore space structure, reservoir properties and lithologic features is performed based on fractional composition of rocks. However, it is impossible to understand in details entire section of even exploration and prospecting wells in case of poor core recovery. Therefore layer-by-layer description (including wells with no core) is carried out based on logging linked to results of core analysis. It was found that logs can be used for lithologic distinguishing and selection of lithologic series of clastic rocks with its material composition determination. Information about lithologic series also allows approaching to a solution for the problem of cyclic sedimentation. Equations of multiple correlations between reservoir properties of rocks and amount of psammite, silty and pelitic particles in rock matrix. It is possible to determine porosity by recorded natural radioactivity on gamma ray charts. Solving the above mentioned problems is considered on the basis of a systematic structural approach.