致密砂岩储层微裂缝发育特征及对物性的影响——以杭锦旗地区十里加汗区带为例

doi:10.13809/j.cnki.cn32-1825/te.2022.02.003

Abstract

Abstract:

The average porosity and permeability of sandstone of Lower Shihezi Formation of Permian system in Shilijiahan area of Hangjinqi area are of 8.3 % and 0.89×10^-3 μm² respectively, causing the reservior to be a typical tight sandstone reservoir. Meanwhile, the microfractures play an important role in improving the physical properties of tight sandstone reservoir. Therefore, the researches of the reservoir in this area focus on the microfractures. By the observation of the microscopic thin section, and combined with the mercury injection, core physical properties and structural characteristics, the types and genesis, formation stages, control factors and the influence of micro fractures on physical properties in this area have been studied. The results show that the tight sandstone of Lower Shihezi Formation in the study area can be divided into intragranular fracture, grain edge fracture and grain penetrating fracture according to the contact relationship of strata, and can be divided into unfilled fracture, incomplete filled fracture and complete filled fracture according to the filling degree. According to the genetic analysis, there are at least three stages of micro fractures in the study area. Their development degree are controlled by the combination of internal factors （sandstone particle size, rock debris composition, rock debris and interstitial content, contact relationship between particles, etc.） and external factors （tectonic stress）. The microfractures mainly affect the permeability of the reservoir. The multi-factor influence is a basic feature of micro fractured tight reservoir. The average throat radius plays a major role in controlling the permeability of the reservoir.

Key words: tight sandstone reservoir, microfracture, filling degree, pore-throat structure, permeability

CLC Number:

TE122

ZHAO Lan. Development characteristics of microfractures in tight sandstone reservoir and its influence on physical properties: A case study of Shiligiahan zone in Hangjinqi[J].Reservoir Evaluation and Development, 2022, 12(2): 285-291.

Figures/Tables 9

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裂缝类型	开度（μm）	面密度（cm/cm²）	发育位置	发育特征	占比（%）
粒内缝	5.6	0.25	颗粒内部	延伸长度小,终止于颗粒内部或边缘	25.9
粒缘缝	12.5	0.51	颗粒边缘	规模中等,延伸中等,多呈网状分布	51.9
穿粒缝	10~25,少数50	0.43	切穿岩石颗粒和基质	规模相对较大,延伸较长,可与粒缘缝交织呈网状	22.2

裂缝类型	发育特征	是否存在孔隙空间	占比（%）
未充填缝	微裂缝未被矿物充填	存在	53.2
未完全充填缝	微裂缝没有完全被矿物充填	部分存在	20.7
完全充填缝	微裂缝形成后,完全被矿物充填	不存在	26.1

Development characteristics of microfractures in tight sandstone reservoir and its influence on physical properties: A case study of Shiligiahan zone in Hangjinqi

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