Pyrolysis data of South Atlantic source rocks from 20 DSDP-ODP sites: Insight on source-rock potential

This data set consists of analytical results from the HAWK Pyrolysis and TOC instrument for 161 bulk samples from Mesozoic to Cenozoic strata at 20 DSDP-ODP sites in the South Atlantic region, from the Weddell Sea in the south to the Demerara Rise in the north, and in the Mozambique Ridge. Based on a revised chronostratigraphic and paleoenvironment framework (Setoyama and Kanungo, submitted), our pyrolysis results, combined with data published by previous studies, allow us to identify seven Mesozoic source-rock intervals: two in the Southern South Atlantic (SA), one in the Central SA and four in the Equatorial SA. Furthermore, these data also provide an estimate of the source-rock potential and quality of the identified intervals, which are influenced by depositional environments. A significant portion of the pyrolysis data is affected by the mineral matrix effect (MME) that artificially lowers the estimated potential and quality of source rocks. Further analyses are therefore required to correct the MME and for the proper identification of organic matter to ensure the reliable determination of organofacies, thereby facilitating improved source rock system evaluation.

本数据集包含HAWK热解与总有机碳（TOC, Total Organic Carbon）分析仪的分析结果，样品为取自南大西洋区域20个深海钻探计划-大洋钻探计划（DSDP-ODP, Deep Sea Drilling Project - Ocean Drilling Program）站位的161件全岩样品（bulk samples），采样范围南起威德尔海（Weddell Sea）、北至德马拉拉海隆（Demerara Rise），同时覆盖莫桑比克海岭（Mozambique Ridge）。
基于修正后的年代地层与古环境框架（Setoyama与Kanungo，已投稿），本研究的热解结果结合前人已发表的数据，可识别出7处中生代（Mesozoic）烃源岩段：南南大西洋（Southern South Atlantic, SA）分布2处、南大西洋中部分布1处、赤道南大西洋分布4处。
此外，该数据集还可对已识别烃源岩段的生烃潜力与品质进行评估，而上述参数受沉积环境的调控。
热解数据中有相当一部分受到矿物基质效应（MME）的影响，该效应会人为低估烃源岩的生烃潜力与品质估算值。
因此，需开展进一步分析以校正矿物基质效应（MME），并对有机质进行精准识别，从而确保有机相（organofacies）的可靠判定，进而助力烃源岩系统评价工作的优化。

搜集汇总

背景与挑战

背景概述

该数据集包含来自南大西洋地区20个DSDP-ODP站点的161个样品的热解分析数据，覆盖中生代到新生代地层，旨在评估源岩潜力和质量。数据识别出七个中生代源岩层段，但部分数据受矿物基质效应影响，需校正以确保可靠评价。数据集包括TOC、S1、S2等关键参数，共1288个数据点，发布于2019年，适用于有机地球化学研究。