The Development Characteristics and Distribution Predictions of the Paleogene Coal‐measure Source Rock in the Qiongdongnan Basin, Northern South China Sea,Acta Geologica Sinica-English Edition

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The Development Characteristics and Distribution Predictions of the Paleogene Coal‐measure Source Rock in the Qiongdongnan Basin, Northern South China Sea
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2021-01-08 , DOI: 10.1111/1755-6724.14625
Dongdong WANG ₁ , Gongcheng ZHANG _{1,

2} , Zengxue LI ₁ , Guoqi DONG ₃ , Rui SUN ₂ , Shuai GUO ₂

Affiliation

There are known to be enormous Cenozoic coal‐type oil and gas resources located in the basins of the South China Sea, among which the Paleogene coal‐measure source rock are one of the main source rock. In order to more effectively analyze the distribution laws of coal‐measure source rock in marginal sea basins and guide coal‐type oil and gas explorations, the Oligocene coal‐measure source rock in the Qiongdongnan Basin were selected as examples in order to systematically analyze the types, development characteristics, control factors, and distribution prediction methods of coal‐measure source rock in marginal sea basins. The Qiongdongnan Basin is located in the northern region of the South China Sea. Previous explorations of the area have determined that the Oligocene coal‐measure source rock in the Qiongdongnan Basin have typical “binary structures”, which include coal seams and terrigenous marine mudstone. Among those, the terrigenous marine mudstone has been found to greatly expand the scope of the coal‐measure source rock. In addition, the coal seams which have been exposed by drilling have been observed to have the characteristics of thin single layer thickness, many layers, and poor stability. Meanwhile, the terrigenous marine mudstone has the characteristics of large thickness and wide distribution. The development of coal‐measure source rock is known to be controlled by many factors, such as paleoclimate and paleobotany condition, paleo‐structure and topography, paleo‐geography, rise and fall of base level, and so on. In accordance with the comprehensive analyses of various control factors of coal‐measure source rock, and the changes in water body energy in sedimentary environments, a genetic model of the “energy belt” for the development and distribution of coal‐measure source rock was proposed. Also, the development and distribution characteristics of coal‐measure source rock in different types of energy belts were clarified. Then, based on the development and distribution characteristics of coal‐measure source rock and their controlling factors, prediction methods of the distribution ranges of coal‐measure source rock were proposed from both qualitative and (semi‐) quantitative aspects. That is to say, a method for (semi‐) quantitative predictions of the distribution ranges of coal‐bearing intervals based on model wave impedance inversion and neural network wave impedance inversion, along with a method for (semi‐) quantitative predictions of the distribution ranges of terrigenous marine mudstone based on topographical slopes, were introduced in this study.

中文翻译：

南海北部琼东南盆地古近系煤系烃源岩的发育特征及分布预测

在南海盆地中，已知有巨大的新生代煤型油气资源，其中古近系煤系烃源岩是主要烃源岩之一。为了更有效地分析边缘海盆地煤系烃源岩的分布规律，指导煤型油气勘探，以琼东南盆地渐新世煤系烃源岩为例，对the东南盆地煤系烃源岩进行了系统分析。边缘海盆地煤系烃源岩的类型，发育特征，控制因素及分布预测方法。琼东南盆地位于南海北部。该地区以前的勘探已经确定，琼东南盆地的渐新世煤系烃源岩具有典型的“二元结构”，包括煤层和陆源海相泥岩。其中，陆源海相泥岩已被发现大大扩展了煤系烃源岩的范围。另外，已经观察到已经通过钻孔暴露的煤层具有薄的单层厚度，多层的层和较差的稳定性的特征。同时，陆源海相泥岩具有厚度大，分布广的特点。众所周知，煤系烃源岩的发育受许多因素控制，如古气候和古植物条件，古构造和地形，古地理，基层的上升和下降等。通过对煤系烃源岩各种控制因素及沉积环境中水体能量变化的综合分析，提出了煤系烃源岩发育与分布的“能带”遗传模型。。阐明了不同类型能源带煤系烃源岩的发育和分布特征。然后，根据测煤源岩的发育，分布特征及其控制因素，从定性和（半）定量方面提出了测煤源岩分布范围的预测方法。也就是说，

更新日期：2021-02-22

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