Известия Томского политехнического университета: Инжиниринг георесурсов (May 2018)

Geochemical criterions for identifying reservoirs and predicting their petroleum potential (Vankor field)

  • Elena Rinatovna Isaeva,
  • Valery Gavrilovich Voroshilov,
  • Timothy Vasilyevich Timkin,
  • Mansour Ziaii

Journal volume & issue
Vol. 329, no. 4

Abstract

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The relevance of research is caused by the necessity to develop new approaches to assessment of petroleum potential of terrigenous sediments based on the study of metals geochemistry in the processes of the imposed epigenesis. The aim of the research is to determine the regularities of chemical elements redistribution in the processes occurring in the oil-water-rock system; based on lithogeochemical data to develop a methodology for evaluating the reservoir rock properties and nature of saturation of reservoirs. The material and methods. The study is based on the data on distribution of U, K, Ca, Ti, Cr, Fe, Mn, Rb, Sr, Ba, Zr the superimposed epigenesis areas of Jurassic-Cretaceous oil and gas deposits selected by the authors. The distribution patterns of these elements were studied in combination with lithological, mineralogical and petrographic studies of core and cuttings of exploratory wells drilled in the area of the Vankor field. The content of U in rocks was determined by delayed neutron, the contents of some elements (K, Ca, Ti, Cr, Fe, Mn, Rb, Sr, Ba, Zr) were defined on the express x-ray fluorescence analyzer INNOV-X50 with external control analyses by ICP MS. Characteristics of the newly formed minerals composition were studied using scanning electron microscope TESCAN VEGA 3 SBU. The results. It was determined that in the studied sediments uranium is a detecting element of the areas of improved reservoir characterized by abnormally low concentrations. The authors have revealed a significant redistribution of some chemical elements associated with hydrocarbon formation and determined the geochemical zonality. The regularities of chemical elements distribution allow predicting petroleum potential of terrigenous sediments section. Within the study area, the selected intervals are productive deposits recommended for testing.

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