安塞地区长7泥页岩体系岩性差异及其对页岩油含量的控制

doi:10.7657/XJPG20250307

摘要/Abstract

摘要：

受物源输入及沉积旋回的影响，陆相泥页岩体系的岩性复杂多变。为深入揭示陆相泥页岩体系的岩性差异及其对页岩油含量的控制，选取安塞地区延长组长7泥页岩体系开展针对性研究。基于岩石学特征与地球化学特征对比，明确了研究区泥岩、页岩、砂岩及砂纹层页岩的发育特征。基于页岩油含量的定量评价及地质参数的剖析，明确了不同岩性内部页岩油含量的差异及其控制因素。研究表明：页岩内部的页岩油含量最高，但可动性差；砂岩和砂纹层页岩的页岩油含量适中，可动性好；泥岩的页岩油含量最低，可动性最差。页岩、泥岩和砂纹层页岩总有机碳含量和热解峰温越高，页岩油含量越高；有机质类型越好，页岩油含量越高。砂岩孔隙度、渗透率越高，页岩油含量越高。

关键词: 安塞地区, 延长组, 岩性差异, 页岩油, 定量评价, 地质参数

Abstract:

Affected by source input and sedimentary cycles, continental mud-shale systems are lithologically complex and diverse. To elucidate the lithological differences of these systems and their controls on shale oil content, the mud-shale system in the 7th member of the Yanchang formation (Chang 7 member) in the Ansai area of Ordos Basin was selected for detailed analysis. By comparing petrological and geochemical characteristics, the development features of mudstone, shale, sandstone, and sand-laminated shale in the study area were identified. Through quantitative evaluation of shale oil content and analysis of geological parameters, the differences in shale oil content between different lithologies and the controlling factors were revealed. The results indicate that shale has the highest content of shale oil, with a poor mobility; sandstone and sand-laminated shale contain moderate content of shale oil, with a good mobility; and mudstone has the lowest content of shale oil, with the poorest mobility. For shale, mudstone, and sand-laminated shale, the higher the total organic carbon content and pyrolysis peak temperature, the higher the shale oil content; the better the organic matter types, the higher the shale oil content. For sandstone, the higher the porosity and permeability, the higher the shale oil content.

Key words: Ansai area, Yanchang formation, lithological difference, shale oil, quantitative evaluation, geological parameter

中图分类号:

P618.12

师良, 张亚雄. 安塞地区长7泥页岩体系岩性差异及其对页岩油含量的控制[J]. 新疆石油地质, 2025, 46(3): 308-317.

SHI Liang, ZHANG Yaxiong. Lithological Differences of Chang 7 Mud-Shale System and Their Controls on Shale Oil Content in Ansai Area, Ordos Basin[J]. Xinjiang Petroleum Geology, 2025, 46(3): 308-317.

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赋存岩性	大量页岩油散失时间/min	散失速度	评价方法	页岩油含量	页岩油可动性
页岩	>45	慢	地球化学法	最高	最差
泥岩	>45	慢	地球化学法	适中	差
砂纹层页岩	30~40	较慢	地球化学法	适中	好
砂岩	<20	快	基于压汞实验的J函数法	最低	最好

有机质类型	岩性	页岩油含量/（mg·g^-1）
有机质类型	岩性	最大值	最小值	平均值
Ⅰ型	页岩	36.8	12.8	21.7
	泥岩	44.7	8.2	26.4
	砂纹层页岩	24.9	7.5	16.1
Ⅱ₁型	页岩	17.7	2.7	11.0
	泥岩	8.4	1.4	4.9
	砂纹层页岩	34.1	10.5	18.1
Ⅱ₂型	页岩	18.5	18.5	18.5
	泥岩	19.6	1.1	9.9
	砂纹层页岩	13.0	7.0	10.0
Ⅲ型	砂纹层页岩	6.2	6.2	6.2