Geochemical characteristics of crude oils and source rocks in the Malaysia-Thailand Joint Development Area (MTJDA), North Malay Basin

IF 3.7 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Marine and Petroleum Geology Pub Date : 2024-09-27 DOI:10.1016/j.marpetgeo.2024.107135

Siti Hanisah Sidik , Khairul Azlan Mustapha , Alok Kumar , Supat Napanoparatkaew , Marahizal Malihan

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Abstract

The Malaysia-Thailand Joint Development Area (MTJDA) that located in the North Malay Basin has been investigated in this study to resolve few issues concerning to petroleum potential and resources which has been abandon for decades. Despite Malay Basin having been proven to contain prolific oil and gas resources, the MTJDA which located in the Northern area however contains mainly gas with very minor oil. Thus, this study aimed to investigate the main factor that controls the hydrocarbon generation, type and distribution in this basin. The investigation involves biomarker characterization, thermal maturity assessment of source rock, crude oil and condensate, together with oil-oil and oil-source correlation that has never been established before. The geochemical data as indicated by bitumen extraction, GC-MS and Py-GC analyses on 40 cutting samples and 8 liquid samples (six oil samples and two condensate samples) revealed that the cutting samples were moderate in quality with variable richness based on TOC (total organic carbon) and a variable degree of maturity based on the biomarker proxy parameters of isoprenoid, hopanoid and steroid. The organic matter input for the source rock was derived from a mixed marine-terrestrial and terrestrial source and deposited in fluvial-deltaic/estuarine settings having oxic to sub-oxic depositional conditions. Based on biomarker fingerprints and proxy parameters, the oil and condensate samples were essentially of the same group, originating from a similar source rock, with some facies variation due to variations in organic matter input and degree of maturity. The results also indicated that the crude oil samples were originated from the coaly and carbonaceous shales of Group I, with mixed kerogen of type II/III that could produce gas with minor oil. There is also the possibility that these hydrocarbons were generated from a deeper interval of Group E (higher thermal maturity), deposited in a similar setting as Group I.

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北马来盆地马来西亚-泰国联合开发区（MTJDA）原油和源岩的地球化学特征

本研究对位于北马来盆地的马来西亚-泰国联合开发区（MTJDA）进行了调查，以解决与已废弃数十年的石油潜力和资源有关的一些问题。尽管马来盆地已被证实蕴藏着丰富的石油和天然气资源，但位于北部地区的 MTJDA 却主要蕴藏着天然气，只有极少量的石油。因此，本研究旨在调查控制该盆地碳氢化合物生成、类型和分布的主要因素。调查内容包括生物标记表征、源岩、原油和凝析油的热成熟度评估，以及油-油和油-源的相关性，这在以前是从未有过的。对 40 个切割样本和 8 个液体样本（6 个石油样本和 2 个凝析油样本）进行的沥青萃取、气相色谱-质谱（GC-MS）和派-气相色谱（Py-GC）分析所显示的地球化学数据表明，切割样本的质量适中，根据总有机碳（TOC）计算的富集度各不相同，根据异戊烯类、类己酮和类固醇等生物标志物替代参数计算的成熟度也各不相同。源岩的有机质输入来自海洋-陆地和陆地混合源，沉积于具有缺氧至亚缺氧沉积条件的河流-三角洲/河口环境中。根据生物标记指纹和替代参数，石油和凝析油样本基本上属于同一类，来源于相似的源岩，但由于有机质输入和成熟度的不同，面貌存在一些差异。研究结果还表明，原油样本来源于第一组的褐煤页岩和碳质页岩，以及第二/三类混合角质，可产生气体和少量石油。这些碳氢化合物也有可能来自 E 组（热成熟度较高）的较深区段，沉积环境与 I 组类似。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Marine and Petroleum Geology 地学-地球科学综合

CiteScore

8.80

自引率

14.30%

发文量

475

审稿时长

63 days

期刊介绍： Marine and Petroleum Geology is the pre-eminent international forum for the exchange of multidisciplinary concepts, interpretations and techniques for all concerned with marine and petroleum geology in industry, government and academia. Rapid bimonthly publication allows early communications of papers or short communications to the geoscience community. Marine and Petroleum Geology is essential reading for geologists, geophysicists and explorationists in industry, government and academia working in the following areas: marine geology; basin analysis and evaluation; organic geochemistry; reserve/resource estimation; seismic stratigraphy; thermal models of basic evolution; sedimentary geology; continental margins; geophysical interpretation; structural geology/tectonics; formation evaluation techniques; well logging.