GEOCHEMICAL CHARACTERISTICS OF THE DOMANIKOID-TYPE LATE DEVONIAN STRATA OF THE KOBLANDY-TAMDY UPLIFT

Neft i gaz Pub Date : 2022-12-30 DOI:10.37878/2708-0080/2022-6.02

A. Zhanserkeyeva, I. Afonin

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Abstract

The article presents the lithological and geochemical characteristics of the Upper Devonian sediments of the Koblandy structure in the northeastern part of the Precaspian Basin. Based on the core data from the Koblandy-3 well from the Upper Devonian strata of the presalt complex, the results of RockEval and isotopic analysis are presented. Intervals of kerogen-siliceous-carbonate rocks enriched in organic matter have been established, which, according to a complex of microand macrocharacteristics, can be attributed to domanikoid-type sediments. The Domanikoid highcarbon formation of the neighboring Volga-Ural Basin is an effective source rock. The generative potential of the established domanikoid-type sediments of the Koblandy-3 well is characterized by high TOC values of 0.1-5.7%, the Production Index (PI) varies from 0.1-0.3, which corresponds to the oil window. Three lithotypes of domanikoid-type sediments deposited in predominantly deep marine environment have been established. The association of potential reef bodies in the vicinity of domanikoid-type source rocks indicate in favor of petroleum system within the upper Devonian presalt complex of the Koblandy-Tamdy uplift zone

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寇布兰-坦米提隆起带晚泥盆世域状地层地球化学特征

本文介绍了里海盆地东北部科布兰提构造上泥盆统沉积物的岩性和地球化学特征。根据盐下杂岩上泥盆统koblandi -3井岩心资料，介绍了岩心岩石分析和同位素分析结果。建立了富含有机质的干酪根-硅质-碳酸盐岩层段，根据其微观和宏观特征的复合体，可将其归属于陆块类沉积物。邻近的伏尔加-乌拉尔盆地的Domanikoid高碳组是有效的烃源岩。Koblandy-3井已建立的domanikoids型沉积物具有较高的TOC值(0.1 ~ 5.7%)，生产指数(PI)在0.1 ~ 0.3之间，对应于产油窗口。建立了三种主要沉积于深海环境的海陆类岩型。在domanikotype烃源岩附近的潜在礁体组合表明，在koblandi - tamdy隆起带上泥盆统盐下杂岩内存在油气系统

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