鄂尔多斯盆地富县地区三叠系延长组长7油层组深水重力流致密砂岩成因与分布

doi:10.11743/ogg20250505

Abstract

Abstract:

Deep-water gravity flow reservoirs are widely distributed in the oil layer group of the 7th member of the Yanchang Formation （also referred to as the Chang 7 oil layer group） in the Fuxian area， Ordos Basin. However， the tightening mechanisms of these reservoirs remain unclear. Using test methods and technologies including X-ray diffraction （XRD）， petrophysical analysis， granulometry， casting thin section observation， scanning electron microscopy （SEM）， high-pressure mercury intrusion porosimetry， and oil layer interpretation， we analyze the fundamental characteristics of gravity flow reservoirs in the Chang 7 oil layer group， highlighting the tightening mechanisms and distribution patterns of the reservoirs. The results indicate that the Chang 7 oil layer group consists primarily of fine-grained feldspathic sandstone and lithic feldspathic sandstone， with a porosity ranging from 0.5% to 18.4% （average： 8.44%） and a permeability from 0.01 × 10^-3 µm² to 14.1 × 10^-3 µm² （average： 0.36 × 10^-3 µm²）. Within this member， sandy debris flow reservoirs exhibit the most favorable pore structures and the best physical properties， with an average porosity of 8.94% and a permeability of 0.39 × 10^-3 µm². Slide-slump reservoirs come the second， which have an average porosity of 8.28% and a permeability of 0.40 × 10^-3 µm². In contrast， turbidite reservoirs show the poorest physical properties， with an average porosity of 6.90% and a permeability of 0.28 × 10^-3 µm². The gravity flow reservoirs are poorly sorted and characterized by fine grain sizes， high matrix content， and weak resistance to compaction. Furthermore， these reservoirs exhibit high carbonate cement content， which is identified as the primary reason for reservoir tightening. Week dissolution in the late stage failed to change the overall tightness of reservoirs in the Chang 7 oil layer group. Diagenetic evolution places the Chang 7 Oil layer group in the meso-diagenetic stage A， having undergone a single-phase hydrocarbon charging， with the homogenization temperatures of inclusions ranging primarily from 110 ℃ to 120 ℃. Large-scale hydrocarbon accumulation in this oil layer group occurred during the late Early Cretaceous （105 ~ 120 Ma）. In the Chang 7 oil layer group， high-quality Class Ⅰ reservoirs occur in sandy debris flow deposits. In contrast， moderate Class Ⅱ reservoirs are found in intervals consisting of sandy debris flow and turbidity current deposits， and poor Class Ⅲ reservoirs appear in turbidity current deposits. The comprehensive analysis suggests that the section with sandy debris flow deposits in the 1st and 2nd oil layer sub-groups represent play fairways for the exploration and exploitation of deep-water tight-sand oil reservoirs.

Key words: sandy debris flow reservoir, diagenetic evolution, gravity flow tight sandstone, Chang 7 oil layer group, Fuxian area, Ordos Basin

CLC Number:

TE122.2

Jun ZHANG, Yubin BAI, Hai ZHANG, Jingzhou ZHAO, Ning XU. Origin and distribution of deep-water gravity-flow tight-sand reservoirs in the oil layer group of the 7th member of the Yanchang Formation， Fuxian area， Ordos Basin[J]. Oil & Gas Geology, 2025, 46(5): 1446-1465.

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重力流储层类型	样品个数	填隙物含量/%
重力流储层类型	样品个数	杂基	高岭石	绿泥石	方解石	白云石
滑动-滑塌储层	5	2.6	0.5	4.3	4.3	0.2
砂质碎屑流储层	19	5.3	0.6	5.2	3.1	2.4
浊积岩储层	5	9.4	0.7	6.7	4.8	2.8

储层级别特征参数	Ⅰ类储层	Ⅱ类储层	Ⅲ类储层
孔隙度/%	> 9.00	7.00 ~ 9.00	< 7.00
渗透率/（10^-3μm²）	> 0.30	0.10 ~ 0.30	< 0.10
排驱压力/MPa	0.30 ~ 1.50	1.00 ~ 1.20	1.00 ~ 1.50
中值压力/MPa	1.94 ~ 11.69	7.21 ~ 18.67	9.51 ~ 42.62
平均喉道半径/μm	0.13 ~ 0.46	0.08 ~ 0.14	0.03 ~ 0.13
中值喉道半径/μm	0.06 ~ 0.38	0.04 ~ 0.10	0.02 ~ 0.08
孔隙类型	粒间孔、粒间孔-溶孔	溶孔、溶孔-微孔	微孔
孔隙结构特征	Ⅰ类	Ⅱ类	Ⅲ类
岩性	细砂岩	粉砂岩	泥质粉砂岩
含油性	油斑及以上	油迹	荧光或不含油
砂厚/m	> 15.00	5.00 ~ 15.00	< 5.00
沉积微相类型	砂质碎屑流沉积	滑动-滑塌沉积、浊流沉积	浊流沉积
储层评价	优质	中等	差

Origin and distribution of deep-water gravity-flow tight-sand reservoirs in the oil layer group of the 7th member of the Yanchang Formation， Fuxian area， Ordos Basin

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