Sea Water-mineral Substance-living Matter System

Procedia Earth and Planetary Science Pub Date : 2017-01-01 DOI:10.1016/j.proeps.2016.12.008

B.N. Ryzhenko, E.V. Cherkasova, E.S. Sidkina

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Abstract

Formation of hydrocarbons in the seawater - mineral substance - living matter system is modeled. Some systems of various living matter compositions and stoichiometry and also at several sets of T,P parameters are simulated. During diagenesis kerogens and hydrocarbons are formed. The equilibrium constant of the reaction between oily kerogen and oxidized one, methane and CO₂ is evaluated: Φ₁C₂₉₂H₂₈₈O₁₂(kerogen, H/C 0.99, O/C 0.041) → Φ₂C₁₂₈H₆₈O₇(kerogen, H/C 0.53, O/C 0.055)+xСH₄+yCO₂+zH₂O, where Φ₁ and Φ₂ moles of kerogens; x, y, z – stoichiometry coefficients. In thermodynamically closed system the aqueous natural hydrocarbons are stable up to 300^оС (at pressure above water saturated vapor) due to reductive environment formation (lg f H₂ ≈ 10^-4 бар). Equilibrium mineral assemblages of the system include quartz, kaolinite, muscovite, ankerite, siderite, pyrite, (Ca,Mg)CO₃, (Ca,Sr)CO₃ and paragonite. High salinity Cl-HCO₃-Na aqueous solution also contains CO₂ of tens g/l and ammonium nitrogen.

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海水-矿物质-生物系统☆

模拟了海水-矿物-生物系统中碳氢化合物的形成过程。模拟了一些具有不同生物物质组成和化学计量的系统，以及若干组T、P参数下的系统。成岩作用形成干酪根和烃类。计算了含油干酪根与氧化干酪根、甲烷和CO2反应的平衡常数:Φ1C292H288O12(干酪根，H/C 0.99, O/C 0.041)→Φ2C128H68O7(干酪根，H/C 0.53, O/C 0.055)+xСH4+yCO2+zH2O，其中干酪根的摩尔数Φ1和Φ2;X y z -化学计量系数。在热力学封闭体系中，由于还原环境的形成(lg f H2≈10-4 бар)，含水天然烃在300оС(在高于水饱和蒸汽的压力下)是稳定的。体系平衡矿物组合包括石英、高岭石、白云母、铁云母、菱铁矿、黄铁矿、(Ca,Mg)CO3、(Ca,Sr)CO3和paragonite。高盐度Cl-HCO3-Na水溶液中还含有数十g/l的CO2和铵态氮。

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Procedia Earth and Planetary Science

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