深水重力流沉积类型及含油性对比——以鄂尔多斯盆地富县地区三叠系延长组长7—长9油层组为例

doi:10.11743/ogg20250508

Abstract

Abstract:

In the Fuxian area of the Ordos Basin， the 7th‒9th oil groups in the Triassic Yanchang Formation （also referred to as the Chang 7‒9 oil groups） hold great petroleum resource potential. Previous studies mostly hold that sandstones in these oil groups are dominated by deltaic deposits. Although gravity-flow deposits have been discovered in the Chang 7 oil group in recent years， some issues remain unclear， including their existence and distribution range across the Chang 7‒9 oil groups. Using core observations， grain size analysis， and thin section observations， we identify the primary types of gravity-flow deposits and their distributions， together with the comparison of reservoir characteristics and oil-bearing properties within. The results indicate that gravity-flow deposits are widely distributed across the Chang 7‒9 oil groups in the Fuxian area， including sandy debris-flow deposits， turbidite-flow deposits， and slide-slump deposits. The sandy debris-flow deposits， among others， feature great thicknesses and massive beddings， with rip-up clasts visible. Their grain-size cumulative probability curves exhibit three primary patterns： a coarse-skewed single-segment pattern， a short-tailed two-segment pattern， and a two-segment pattern with high suspended component content. In contrast， the turbidite-flow deposits are thin， with incomplete Bouma sequences observable in cores. Their grain-size cumulative probability curves primarily show a fine-skewed single-segment pattern. In contrast， the slide-slump deposits are characterized by wrinkling deformation， convolute beddings， and stepped faults. The comparison reveals that the sandy debris-flow deposits are generally superior to the turbidite-flow deposits， exhibiting high reservoir quality， favorable oil-bearing properties， and high daily oil production from well tests. Among the widespread gravity-flow deposits in the Chang 7‒9 oil groups in the Fuxian area， the sandy debris-flow deposits show the most extensive distribution， as well as the most favorable reservoir physical properties and oil-bearing properties. Therefore， they should be prioritized as significant targets for future exploration and development of tight oil in the Fuxian area.

Key words: oil-bearing property, sandy debris-flow deposits, turbidite-flow deposits, slide-slump deposits, gravity-flow deposits, Fuxian area, Ordos Basin

CLC Number:

TE121.3

Linxi WANG, Jingzhou ZHAO, Zhendong GAO, Fanrong WEI, Shiqi ZHOU, Xuangang MENG, Xinzhi YAN, Ning XU. Types of deep-water gravity-flow deposits and comparison of their oil-bearing properties： A case study of the 7th-9th oil groups in the Triassic Yanchang Formation， Fuxian area， Ordos Basin[J]. Oil & Gas Geology, 2025, 46(5): 1504-1521.

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沉积类型	岩心特征	粒度特征						概率累积曲线类型	概率累积曲线起始段粒径Φ值	粒径Φ值	薄片特征
沉积类型	岩心特征	平均粒径Φ值	标准偏差	C/μm	M/μm	偏度	尖度	概率累积曲线类型	概率累积曲线起始段粒径Φ值	粒径Φ值	薄片特征
砂质碎屑流沉积	块状层理、漂浮泥砾和泥岩撕裂屑	3.37	0.45	187.9	101.0	0.36	3.39	短尾二段式、一段式和高悬二段式	2 ~ 3	2 ~ 5	颗粒次棱角状-次圆状
浊流沉积	鲍玛序列	3.97	0.36	114.1	64.4	0.05	2.86	一段式	~ 3	3 ~ 5	颗粒次棱角状-次圆状

Types of deep-water gravity-flow deposits and comparison of their oil-bearing properties： A case study of the 7th-9th oil groups in the Triassic Yanchang Formation， Fuxian area， Ordos Basin

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