车尔尼雪夫岭塔尔北地块古生界有机质及沉积潜力

IF 1.2 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Russian Geology and Geophysics Pub Date : 2023-01-20 DOI:10.2113/rgg20214414

O. Kotik, I. Kotik, I. Dan’shchikova, L. Sokolova

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引用次数: 0

摘要

–研究区域位于Chernyshev山脊内，这是一个褶皱-逆冲构造，是Timan–Pechora省油气勘探的一个有前景的区域。采用岩性、岩石学、有机岩石学、有机地球化学等方法，对车尔尼雪夫岭塔尔贝区块Vorgamusyurskaya-1井剥离的古生代（上奥陶统至下石炭统）油气藏的烃源岩进行了研究。大部分剖面的特征是Corg值低（＜0.5%）、遗传潜力低（S1+S2＜0.5 mg HC/g岩石）和氢指数低（HI＜100 mg HC/g Corg）。在该剖面的不同地层水平上，确定了Corg（高达0.9%）、S1+S2（高达2.1 mg HC/g岩石）和HI（高达277 mg HC/g Corg）升高值的石油烃源岩：上泥盆纪（D3tm–sr）、上志留系（S2gj）和上奥陶纪（O3mt）。有机质（OM）的显微组分组成和烃在沥青饱和组分中的分布表明，石油烃源岩仅包括海相OM（II型干酪根）。根据沥青反射率（RVeq）、岩石蒸发热解（Tmax）和牙形石变色指数（CAI）来估计OM的蚀变程度。可用的RVeq（0.63–0.84%）、Tmax（430–443°C）和CAI（1.5–2.0）数据表明，整个古生代井段都处于油窗（MC1–MC3）中。新资料细化了沉积剖面的岩性分区，根据该分区，OM达到以下级别：下石炭系和法门系沉积物中的MC1级，Frasnian至下志留系上部的MC2级，下志留纪下部和上奥陶纪的MC3级。油气烃源岩的研究结果以及OM的类型和成熟度将是盆地建模的基础，这将提高车尔尼雪夫山脊油气形成重建的可靠性。

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Organic Matter and Generation Potential of Paleozoic Deposits in the Tal’bei Block of the Chernyshev Ridge (Timan–Pechora Petroleum Province)

––The study area is located within the Chernyshev Ridge, a fold–thrust structure, which is a promising area for oil and gas exploration in the Timan–Pechora province. Petroleum source rocks of Paleozoic (from Upper Ordovician to lower Carboniferous) deposits stripped by the Vorgamusyurskaya-1 well in the Tal’bei block of the Chernyshev Ridge were studied by lithological, petrographic, organic-petrology, and organic-geochemistry methods. Most of the section is characterized by low values of Corg (<0.5%), genetic potential (S1 + S2 < 0.5 mg HC/g rock), and hydrogen index (HI < 100 mg HC/g Corg). Petroleum source rocks with elevated values of Corg (up to 0.9%), S1 + S2 (up to 2.1 mg HC/g rock), and HI (up to 277 mg HC/g Corg) were identified at different stratigraphic levels of the section: Upper Devonian (D3tm–sr), upper Silurian (S2gj), and Upper Ordovician (O3mt). The maceral composition of organic matter (OM) and the distribution of hydrocarbons in the saturated fraction of bitumens indicate that petroleum source rocks include only marine OM (type II kerogen). The degree of catagenesis of OM was estimated based on the bituminite reflectance (RVeq), Rock-Eval pyrolysis (Tmax), and conodont color alteration index (CAI). The available RVeq (0.63–0.84%), Tmax (430–443 °C), and CAI (1.5–2.0) data indicate that the entire Paleozoic well section is in the oil window (MC1–MC3). The new data refined the catagenetic zoning of the sedimentary section, according to which the OM reached the following gradations: MC1 in the lower Carboniferous and Famennian deposits, MC2 in the interval from the Frasnian to the upper part of the lower Silurian, and MC3 in the lower part of the lower Silurian and in the Upper Ordovician. The results of the study of petroleum source rocks and the type and maturity of OM will be the basis for basin modeling, which will increase the reliability of reconstructions of oil and gas formation at the Chernyshev Ridge.

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来源期刊

Russian Geology and Geophysics 地学-地球科学综合

CiteScore

2.00

自引率

18.20%

发文量

审稿时长

4-8 weeks

期刊介绍： The journal publishes original reports of theoretical and methodological nature in the fields of geology, geophysics, and geochemistry, which contain data on composition and structure of the Earth''s crust and mantle, describes processes of formation and general regularities of commercial mineral occurrences, investigations on development and application of geological-geophysical methods for their revealing. As to works of regional nature, accelerated publication are available for original papers on a variety of problems of comparative geology taking into account specific character of Siberia, adjacent Asian countries and water areas. The journal will also publish reviews, critical articles, chronicle of the most important scientific events, and advertisements.