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川东北普光地区飞仙关组三段储层特征及主控因素

Reservoir Characteristics and Main Controlling Factors of the Third Member of Feixianguan Formation in Puguang Area, Northeastern Sichuan Basin

陈男男, 夏青松, 卿山

Environment and Resource / 2026,8(2): 220-230 / 2026-05-06 17 17

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• Information:

  西南石油大学地球科学与技术学院，成都

• Keywords:
  Puguang area; Feixianguan group three sections; Carbonate reservoir; Reservoir characteristics; Main controlling factors; Low porosity and low permeability
  普光地区; 飞仙关组三段; 碳酸盐岩储层; 储层特征; 主控因素; 低孔低渗
• Abstract: The carbonate gas reservoir in the third member of Feixianguan Formation in Puguang gas field is rich in reserves but low in utilization degree, which is an important layer system for the replacement of oil and gas resources in this area. In order to clarify the reservoir development mechanism of the third member of Feixianguan Formation ( T1f3 ) in Puguang area, northeastern Sichuan, and provide geological basis for efficient exploration and development of this member, this paper comprehensively uses core observation, thin section identification and scanning electron microscopy to systematically analyze reservoir petrology, reservoir space and physical properties, and clarify the main controlling factors of reservoir development. The results show that the reservoir of the third member of Feicheng Formation in the study area is dominated by dolomite, which is mainly composed of two basic types of granular dolomite and grain dolomite, and biogenic microbial rocks in grain dolomite. The reservoir space is dominated by pore type, and intercrystalline pores and intercrystalline ( grain ) dissolved pores are the dominant types. The physical properties are characterized by low porosity and low permeability, and the interwell heterogeneity is significant. The porosity and permeability are weakly positively correlated, and the permeability is comprehensively controlled by pore type, dissolution and microfracture development. The development of the reservoir is controlled by the sedimentarydiagenetic- tectonic interaction. The original skeleton construction of sedimentary facies, the preservation of dolomitized pores, the improvement of multi-stage dissolution superimposed pores, and the finalization of structural fracture-fluid coupling reservoirs are the four core main controlling factors. The formation of high-quality and effective reservoirs is the result of the synergistic coupling of the four main controlling factors. The research results of this paper provide important geological support for the prediction of the sweet spot area and the effective utilization of reserves in the third section of the Fei3 reservoir in Puguang area. 普光气田飞仙关组三段碳酸盐岩气藏储量丰富但动用程度低，是该区油气资源接替的重要层系。为明确川东北普光地区飞仙关组三段（T1f3）储层发育机制，为该层段高效勘探开发提供地质依据，本文综合利用岩心观察、薄片鉴定及扫描电镜等测试手段，系统分析储层岩石学、储集空间及物性特征，并明确储层发育的主控因素。结果表明，研究区飞三段储层以白云岩为主，主要为颗粒白云岩、晶粒白云岩两类基础类型及晶粒白云岩中生物成因的微生物岩，储集空间以孔隙型为主、晶间孔与晶（粒）间溶孔为优势类型，物性整体呈低孔低渗特征且井间非均质性显著，孔渗呈弱正相关，渗透率受孔隙类型、溶蚀作用及微裂缝发育程度综合控制；该储层发育受沉积-成岩-构造作用协同控制，沉积相原始骨架构建、白云岩化孔隙保存、多期溶蚀叠加孔隙改善、构造断裂-流体耦合储层定型为其四类核心主控因素，优质有效储层的形成是四种主控因素协同耦合作用的结果。本文研究成果为普光地区飞三段储层甜点区预测与储量有效动用提供了重要地质支撑。
• DOI: 10.35534/er.0802030 (registering DOI)
• Cite: 陈男男，夏青松，卿山．川东北普光地区飞仙关组三段储层特征及主控因素［J］．环境与资源，2026，8（2）：220-230.