鄂尔多斯盆地中部三叠系延长组7段烃组分的运移分异作用

doi:10.11743/ogg20240111

Abstract

Abstract:

The shale sequence of the 7^th member of the Yanchang Formation （also referred to as the Chang 7 Member） in the Ordos Basin consists of mudstones， shales， and sandstones. To delve into the migration differentiation of shale oil components in different lithologies， we investigate the migration differentiation of typical hydrocarbon components in the central Ordos Basin. The findings show that the rocks exhibit different contents of the four group components： saturated hydrocarbons （SAT）， aromatic hydrocarbons （ARO）， polar nitrogen-， sulfur-， and oxygen-containing compounds （NSO）， and asphaltenes （Asph）. Specifically， the sandstones manifest high SAT content and low NSO+Asph content. Conversely， the shales and mudstones exhibit low SAT content and high NSO+Asph content. Regarding n-alkanes， the sandstones demonstrate high nC_11-15 content and low nC_23-39 content， while the shales and mudstones display low nC_11-15 content and high nC_23-39 content. Compared to the sandstones， the shales and mudstones show more significant variations in the Pr/Ph， Pr/nC₁₇， and Ph/nC₁₈ ratios. These rocks manifest low C₂₇/C₂₉ regular sterane ratios and low Ts/Tm and Ts/（Ts+Tm） ratios， while the sandstones show opposite trends. They demonstrate substantial variability in 22S/（22S+22R） ratios for C₃₂ homohopane， in contrast to the relatively concentrated ratios for the sandstones. Besides， the sandstones are characterized by high gammacerane index values varying in a broad range， whereas the shales and mudstones exhibit the opposite trend. Notably， the shales and mudstones generally have 8β（H）-drimane/8β（H）-homodrimane ratios exceeding 1， which， however， are typically less than 1 for the sandstones. A comprehensive analysis indicates that the variations in the distributions of the various hydrocarbon group components within the source rocks can be attributed to both differential adsorption and migration differentiation.

Key words: migration differentiation, hydrocarbon component, shale, Chang 7 Member of Yanchang Formation, Triassic, Ordos Basin

CLC Number:

TE122.1

Liang SHI, Bojiang FAN, Zhonghou LI, Ziwei YU, Zijin LIN, Xinyang DAI. Migration differentiation of hydrocarbon components in the 7^th member of the Triassic Yanchang Formation， central Ordos Basin[J]. Oil & Gas Geology, 2024, 45(1): 157-168.

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岩性	样品数/个	数值	TOC/%	抽提烃总量/（mg/g）	SAT含量占比/%	ARO含量占比/%	NSO+Asph含量占比/%
页岩	20	最大值	16.24	13.29	71.29	46.31	65.54
		最小值	1.63	1.27	11.38	2.68	12.06
		平均值	6.58	5.79	48.79	15.80	35.41
泥岩	17	最大值	12.20	13.73	70.80	29.51	54.44
		最小值	1.76	0.89	16.05	1.38	22.16
		平均值	4.95	5.64	51.20	14.49	37.35
砂岩	5	最大值	0.28	4.77	81.21	9.71	37.17
		最小值	0.05	0.75	56.31	3.40	14.01
		平均值	0.15	2.45	70.58	5.71	23.71

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Migration differentiation of hydrocarbon components in the 7^th member of the Triassic Yanchang Formation， central Ordos Basin

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Migration differentiation of hydrocarbon components in the 7^th member of the Triassic Yanchang Formation， central Ordos Basin