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Development characteristics of deepwater gravity flows and tight sandstone reservoir characteristics in Chang 6 in the Huaqing area, Ordos Basin, China
Geological Journal ( IF 1.4 ) Pub Date : 2022-09-11 , DOI: 10.1002/gj.4584 Fanchi Nan 1, 2 , Liangbiao Lin 1, 2 , Zhaobing Chen 3, 4 , Yu Yu 1, 2 , Shangchao Mu 5 , Xuanhao Guo 6
Geological Journal ( IF 1.4 ) Pub Date : 2022-09-11 , DOI: 10.1002/gj.4584 Fanchi Nan 1, 2 , Liangbiao Lin 1, 2 , Zhaobing Chen 3, 4 , Yu Yu 1, 2 , Shangchao Mu 5 , Xuanhao Guo 6
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The tight sandstone reservoirs have become the focus of today's oil and gas exploration. To clarify the microscopic characteristics of the tight sandstone reservoirs of the Chang 63 deep water gravity flow origin in the Huaqing area, the Chang 63 gravity flow origin reservoirs in the study area are divided into three categories. They are the formation reservoir of sandy clastic flow (FROSF), formation reservoir of muddy debris flow deposits and turbidites (FROMT) and formation reservoir of slides and slumps (FROSS). In this study, core and logging data, thin sections, field emission scanning electron microscopy (FE-SEM), and mercury intrusion capillary pressure (MICP) were combined to investigate the rock composition and pore-throat characteristics of tight sandstone reservoirs with different types of gravity flow origins. The reservoir micro-heterogeneity is also investigated in this paper. The results show that the reservoirs with different gravity flow origins are similar in lithology and are mainly composed of feldspar lithic sandstone and lithic feldspar sandstone. The pore types are mainly intergranular pores and feldspar-dissolved pores. There are significant differences in the porosity, permeability, microscopic pore-throat characteristics and microscopic heterogeneity of the reservoirs. From FROSF to FROMT and FROSS, the porosity, permeability, mercury inlet saturation, discharge pressure, median pressure and mercury removal efficiency gradually decrease. The tightness of the reservoir gradually increases. The storage capacity is gradually reduced. The disparity between the throat radius and pore radius gradually increases. The pore-throat structure becomes more complex, and the microscopic heterogeneity of the reservoir gradually increases.
中文翻译：
鄂尔多斯盆地华庆地区长6深水重力流发育特征及致密砂岩储层特征
致密砂岩储层已成为当今油气勘探的重点。为明确华庆地区长 6 3深水重力流成因致密砂岩储层微观特征，长 6 3研究区重力流成因油藏分为三类。它们是砂质碎屑流地层储层（FROSF）、泥质碎屑流沉积和浊积岩地层储层（FROMT）和滑塌地层储层（FROSS）。本研究结合岩心和测井资料、薄片、场发射扫描电子显微镜（FE-SEM）和压汞毛细管压力（MICP）等手段，研究不同类型致密砂岩储层的岩石成分和孔喉特征重力流起源。本文还研究了储层微观非均质性。结果表明，不同重力流成因储层岩性相似，主要为长石岩屑砂岩和岩屑长石砂岩。孔隙类型主要为粒间孔和长石溶孔。储层孔隙度、渗透率、微观孔喉特征和微观非均质性存在显着差异。从FROSF到FROMT和FROSS，孔隙率、渗透率、进汞饱和度、排放压力、中值压力和脱汞效率逐渐降低。储层的密封性逐渐增加。存储容量逐渐减少。喉道半径与孔道半径的差距逐渐增大。孔喉结构更加复杂，储层微观非均质性逐渐增强。储层微观孔喉特征和微观非均质性。从FROSF到FROMT和FROSS，孔隙率、渗透率、进汞饱和度、排放压力、中值压力和脱汞效率逐渐降低。储层的密封性逐渐增加。存储容量逐渐减少。喉道半径与孔道半径的差距逐渐增大。孔喉结构更加复杂，储层微观非均质性逐渐增强。储层微观孔喉特征和微观非均质性。从FROSF到FROMT和FROSS，孔隙率、渗透率、进汞饱和度、排放压力、中值压力和脱汞效率逐渐降低。储层的密封性逐渐增加。存储容量逐渐减少。喉道半径与孔道半径的差距逐渐增大。孔喉结构更加复杂，储层微观非均质性逐渐增强。存储容量逐渐减少。喉道半径与孔道半径的差距逐渐增大。孔喉结构更加复杂，储层微观非均质性逐渐增强。存储容量逐渐减少。喉道半径与孔道半径的差距逐渐增大。孔喉结构更加复杂，储层微观非均质性逐渐增强。
更新日期：2022-09-11
中文翻译：
鄂尔多斯盆地华庆地区长6深水重力流发育特征及致密砂岩储层特征
致密砂岩储层已成为当今油气勘探的重点。为明确华庆地区长 6 3深水重力流成因致密砂岩储层微观特征，长 6 3研究区重力流成因油藏分为三类。它们是砂质碎屑流地层储层（FROSF）、泥质碎屑流沉积和浊积岩地层储层（FROMT）和滑塌地层储层（FROSS）。本研究结合岩心和测井资料、薄片、场发射扫描电子显微镜（FE-SEM）和压汞毛细管压力（MICP）等手段，研究不同类型致密砂岩储层的岩石成分和孔喉特征重力流起源。本文还研究了储层微观非均质性。结果表明，不同重力流成因储层岩性相似，主要为长石岩屑砂岩和岩屑长石砂岩。孔隙类型主要为粒间孔和长石溶孔。储层孔隙度、渗透率、微观孔喉特征和微观非均质性存在显着差异。从FROSF到FROMT和FROSS，孔隙率、渗透率、进汞饱和度、排放压力、中值压力和脱汞效率逐渐降低。储层的密封性逐渐增加。存储容量逐渐减少。喉道半径与孔道半径的差距逐渐增大。孔喉结构更加复杂，储层微观非均质性逐渐增强。储层微观孔喉特征和微观非均质性。从FROSF到FROMT和FROSS，孔隙率、渗透率、进汞饱和度、排放压力、中值压力和脱汞效率逐渐降低。储层的密封性逐渐增加。存储容量逐渐减少。喉道半径与孔道半径的差距逐渐增大。孔喉结构更加复杂，储层微观非均质性逐渐增强。储层微观孔喉特征和微观非均质性。从FROSF到FROMT和FROSS，孔隙率、渗透率、进汞饱和度、排放压力、中值压力和脱汞效率逐渐降低。储层的密封性逐渐增加。存储容量逐渐减少。喉道半径与孔道半径的差距逐渐增大。孔喉结构更加复杂，储层微观非均质性逐渐增强。存储容量逐渐减少。喉道半径与孔道半径的差距逐渐增大。孔喉结构更加复杂，储层微观非均质性逐渐增强。存储容量逐渐减少。喉道半径与孔道半径的差距逐渐增大。孔喉结构更加复杂，储层微观非均质性逐渐增强。
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