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首页> 外文期刊>Energy Exploration & Exploitation >Evaluation of the hydrocarbon generation potential of the Pimenteiras Formation, Parnaiba Basin (Brazil) based on total organic carbon content and Rock-Eval pyrolysis data
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Evaluation of the hydrocarbon generation potential of the Pimenteiras Formation, Parnaiba Basin (Brazil) based on total organic carbon content and Rock-Eval pyrolysis data

机译：基于总有机碳含量和岩析热解数据的Parnaiba盆地（巴西）评价Pimenteiras形成的碳氢化合物产生电位

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摘要

The Parnaiba Basin is a Paleozoic to Mesozoic intraplate volcano-sedimentary basin where the Pimenteiras Formation (Devonian) is the main sequence with potential of hydrocarbon generation, mostly natural gas. The present paper evaluates the potential of hydrocarbon generation of Pimenteiras Formation based on Total Organic Carbon (TOC) and Rock-Eval pyrolysis parameters. In this work, 1077 shale samples of the Pimenteiras Formation distributed in 32 wells were evaluated. The TOC content varies between 0.1 to 4.7 wt.%, partially reflecting the accumulation and preservation rates of the organic matter in marine and coastal depositional environments controlled by regressive-transgressive cycles. The oxic and anoxic conditions vary significantly with deposition in this situation, which were evidenced by HI and OI variations through sample profiles. In the north and center of the basin, the Pimenteiras Formation has a higher potential for hydrocarbon generation relative to the south, probably due to higher anoxic conditions during deposition. The Hydrogen Index indicates the predominance of kerogen types II and III with minor occurrences of types I and IV. The Tmax values indicate general immature conditions and locally postmature, where the lowest temperatures represent the basin ' s burial history, whereas the higher ones were influenced by igneous intrusions and thermogenic anomalies related to the Transbrasiliano Lineament. In addition, the excessive heat around the intrusions altered the Rock-Eval pyrolysis parameters as well as the type of organic matter, resulting in a relative increase of the kerogen types III and IV, which explains the great potential for gas generation in this basin.
机译：帕尔纳盆地是一种古生代到中生代内部的火山沉积盆地，其中Pimenteiras形成（德文郡）是具有碳氢化合物产生的主要序列，主要是天然气。本文评估基于总有机碳（TOC）和岩羟戊解析参数的Pimenteiras形成的潜在含量。在这项工作中，评估了在32个孔中分布的Pimenteiras形成的1077个页面样本。 TOC含量在0.1至4.7重量之间变化。％，部分地反映了通过回归侵袭循环控制的海洋和沿海沉积环境中有机物质的积累和保存率。在这种情况下，氧和缺氧条件随着沉积而显着变化，其通过样品谱通过HI和OI变化来证明。在盆地的北部和中心，Pimenteiras形成具有相对于南方的碳氢化合物产生的潜力较高，可能是由于在沉积期间更高的缺氧条件。氢指数表明了Kerogen类型II和III的优势，具有次要I和IV的次要出现。 Tmax值表示一般不成熟的条件和局部地区，最低温度代表盆地的墓葬历史，而较高的温度受到火棘入侵和与横虫素弦外的热生物大致影响的影响。此外，侵入周围的过热改变了岩石 - 醇热解参数以及有机物质的类型，导致基因型III和IV的相对升高，这解释了该盆中的气体产生的巨大潜力。

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