Organic geochemical characteristics at DSDP Holes 76-534A and 44-391C@en

Pyrolysis assay, bitumen analysis, and elemental analysis of kerogen were used to characterize the organic matter of selected core samples from Hole 534A (Leg 76) and Hole 391C (Leg 44) on the Blake-Bahama Plateau. The organic matter throughout the stratigraphic section appears to be principally of a terrestrial origin. The data from several isolated horizons in the Hatteras and Blake-Bahama Formations imply the presence of significant quantities of autochthonous marine organic matter. However, these horizons appear so limited that they cannot be considered potential liquid hydrocarbon source rocks. All the analyzed samples are immature and have not evolved sufficiently to enter into the main stage of hydrocarbon generation. […]针对布莱克-巴哈马高原（Blake-Bahama Plateau）上的534A钻孔（76航次）与391C钻孔（44航次）的选定岩心样品，本研究采用热解分析（Pyrolysis assay）、沥青分析（bitumen analysis）以及干酪根（kerogen）元素分析对其有机质特征进行表征。全域地层剖面中的有机质主要为陆源成因。哈特拉斯组与布莱克-巴哈马组的数个孤立层位的检测数据表明，该区域存在大量原地海相有机质，但此类层位分布范围极为有限，无法被认定为潜在液态烃源岩。所有分析样品均处于未成熟阶段，尚未演化至生烃作用的主要阶段。[…]