A comparative analysis on source rock properties has been carried out on the Miocene-Pliocene formations as well as the Quaternary terrace deposits using Rock–Eval pyrolysis results and organic petrography as well as some biomarkers results. Samples were obtained from outcrops of the Quaternary terrace deposits, Pliocene-aged Liang Formation together with the Miocene Miri and Setap Shale formations in Brunei-Muara district, with sample lithologies ranging from coal, coaly shale, shale and lignitic sand. High total organic carbon (TOC) and S₂ values ranging from 41.8 to 62.4% and 7.40 mg HC/g rock to 122 mg HC/g rock, respectively, are identified in coals of the terrace deposit, Liang and Miri formations, making these as the best potential source rock due to the “good to excellent” generating potential. Meanwhile, a “fair to poor” potential is exhibited for the coaly shale, shale and lignitic sand samples as a result of their low TOC, HI and S₂ values. The organic matter is composed of kerogen type III (gas prone) and type II-III (mixed oil and gas prone). Organic matter in all studied formations originate from a terrestrial-source, as proven by the abundance of huminite. Organic petrographical and biomarkers studies suggest that the coals and lignitic sand samples were deposited in a mangrove-type mire in a lower delta setting, under oxic and limnic to limnotelmatic conditions, except sample DD2-1, which is deposited in a less water-saturated environment. The samples display the presence of bi-modal and normal distribution of n-alkanes. For all of the samples, the dominating plant types in the palaeomire are of soft, herbaceous plants and this is supported by the low vegetation index and moderate P_aq values. All the studied samples are thermally immature to early mature, as exhibited by the T_max values that range from 300 to 437 °C and vitrinite reflectance readings of 0.22% to 0.46%.

利用岩石-Eval热解结果，有机岩相学以及一些生物标志物的结果，对中新世-上新世地层以及第四纪阶地沉积物进行了源岩性质的对比分析。样品取自文莱-穆阿拉地区的第四纪阶地沉积物，上新世时代的梁组以及中新世美里和塞塔普页岩地层的露头，样品岩性范围包括煤，煤质页岩，页岩和轻木质砂岩。高总有机碳（TOC）和S ₂在梯田矿床，梁和美里地层的煤中，分别确定了41.8％至62.4％的碳氢化合物值和122 mg HC / g的7.40 mg HC / g岩石，由于“优秀到优秀”的潜力。同时，由于TOC，HI和S ₂含量较低，导致煤质页岩，页岩和褐砂样品的潜力“中等至差”。价值观。有机物由III型干酪根（易燃气体）和II-III型（油气易混）组成。腐殖质的丰富性证明，所有研究的地层中的有机物都来自陆源。有机岩相学和生物标志物研究表明，煤和木炭砂样品沉积在较低三角洲的红树林型泥潭中，在有氧和石灰岩至高岭土条件下，但DD2-1样品沉积在水饱和度较低的情况下环境。样品显示正构烷烃存在双峰和正态分布。对于所有样品，古土壤中主要的植物类型是柔软的草本植物，这由低植被指数和适度的P _{aq所支持。}价值观。所有研究的样品是热未成熟至成熟早，作为表现出由Ť_最大范围从300至437的0.22％的值℃，镜质组反射读数0.46％。