中国陆相页岩油分类及其意义

doi:10.11743/ogg20230401

Abstract

Abstract:

China has significant potential for the exploration of lacustrine shale oil， which serves as an important alternative resource for conventional oil and gas. However， the development and recovery of lacustrine shale oil face significant constraints due to the lack of fundamental research， unclear mechanisms of its formation and accumulation， and the absence of standardized criteria for evaluating “sweet spots”. To address these issues， the authors proposed a set of simplified standards for lacustrine shale oil classification， taking into account previous research and the practical conditions of exploration and development. Based on the storage space and type of reservoir rocks， shale oil reservoirs are commonly classified into three major types， namely interbedded sand-shale， fractured shale， and pure shale， with the last type being taken as the focus of discussion in this paper. The pure shale type can be classified into laminated， bedded and massive shale oil reservoirs based on the sedimentary structure. Although the grain size was not taken as one of the parameters for shale oil classification， we kept the traditional three terminal element category and mixed category of minerals， and removed further subdivided subcategories； the Rock-Eval S₁ was used instead of TOC and R_o to divide shale oil reservoirs into three types： low oil content， medium oil content and high oil content； the formation pressure coefficient less than 0.8 is defined as abnormally low pressure， 0.8 ~ 1.2 is classified as normal pressure， and greater than 1.2 is classified as abnormally high pressure； the crude oil viscosity is not involved in the classification of shale oil reservoir types. In addition， this study designated type Ⅰ， Ⅱ and Ⅲ sweet spots， and discussed the representative types of shale oil reservoirs in typical continental basins in China. This paper enhances our understanding of the assessment standards， the type of rocks and the distribution of “sweet spots” in shale oil reservoirs. As a result， this research contributes to the advancement of shale oil exploration and development， providing valuable insights for future endeavors in this field.

Key words: pressure coefficient, mineralogical composition, sedimentary structure, residual hydrocarbon S₁, geologic sweet spot, resource assessment, lacustrine shale oil

CLC Number:

TE122.1

Zhijun JIN, Qian ZHANG, Rukai ZHU, Lin DONG, Jinhua FU, Huimin LIU, Lu YUN, Guoyong LIU, Maowen LI, Xianzheng ZHAO, Xiaojun WANG, Suyun HU, Yong TANG, Zhenrui BAI, Dongsheng SUN, Xiaoguang LI. Classification of lacustrine shale oil reservoirs in China and its significance[J]. Oil & Gas Geology, 2023, 44(4): 801-819.

Figures/Tables 9

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页岩油类型	沉积构造	岩石热解滞留烃含量S₁/（mg/g）	地层压力系数	典型实例
夹层型				长7段
裂缝型				风城组
纯页岩型	纹层状	<2	<0.8
			0.8 ~ 1.2
			>1.2
		2 ~ 4	<0.8	长7段
			0.8 ~ 1.2	沙河街组、孔店组、长7段
			>1.2	沙河街组、青山口组
		>4	<0.8
			0.8 ~ 1.2	沙河街组
			>1.2	沙河街组
	层状	<2	<0.8
			0.8 ~ 1.2
			>1.2
		2 ~ 4	<0.8
			0.8 ~ 1.2	沙河街组、孔店组
			>1.2	沙河街组、青山口组
		>4	<0.8
			0.8 ~ 1.2	沙河街组、孔店组
			>1.2	沙河街组
	块状	<2	<0.8
			0.8 ~ 1.2	风城组
			>1.2	芦草沟组、风城组
		2 ~ 4	<0.8
			0.8 ~ 1.2	风城组
			>1.2	芦草沟组、风城组、青山口组
		>4	<0.8
			0.8 ~ 1.2
			>1.2

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Classification of lacustrine shale oil reservoirs in China and its significance

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