针对四川盆地灯影组四段储层强非均质性及利用地下资料进行储层预测约束不足的问题，以川北宁强地区出露良好的灯四段（藻）丘滩复合体剖面作为野外原型模型，通过剖面详测、系统取样及薄片分析，开展露头储层地质建模，建立储层参数与岩相构型的空间关系。取得以下认识： ①宁强地区灯影组四段可划分为下、中、上3个亚段，构成由中缓坡→弱镶边台缘→强镶边台缘的向上变浅旋回。主要岩性类型为微生物白云岩和晶粒白云岩，其中以微生物白云岩为主，具体包括藻格架白云岩、藻叠层白云岩、藻凝块白云岩、藻砂屑白云岩、藻纹层白云岩等。上亚段在台缘发育典型的（藻）丘滩复合体，其中的藻格架白云岩、藻叠层白云岩和藻凝块白云岩的孔隙度>4.5%，藻砂屑白云岩和细晶白云岩的孔隙度介于2.5%~3.5%；在台内相变为藻纹层白云岩、粉细晶及泥粉晶白云岩，孔隙度<2.5%； ②藻格架白云岩和藻凝块白云岩的储集空间以大孔隙大孔径为主，藻叠层白云岩、藻砂屑白云岩、细晶白云岩的储集空间以中孔隙中孔径为主，藻纹层白云岩、粉细晶白云岩及泥粉晶白云岩的储集空间以小孔隙小孔径为主，具双重孔喉结构； ③岩相叠置关系清晰，藻砂屑和细晶白云岩为丘基和丘间的碎屑滩沉积，藻叠层白云岩为丘基之上的微生物丘拓植期沉积，藻格架白云岩为丘核建造，藻凝块白云岩为丘翼沉积。川北灯四上亚段台缘丘滩复合体呈“小丘大滩”规模发育的特征，具有优质储层发育潜力。

To address the issues of strong heterogeneity in the 4th member of the Dengying Formation reservoir in the Sichuan Basin and insufficient constraints for reservoir prediction using subsurface data, a well-exposed (algae) mound-shoal complexes profile of the 4th member of the Dengying Formation in Ningqiang area, northern margin of the Sichuan Basin is selected as a field prototype model. Based on detailed field surveying, sampling, and rock thin section analysis, this study establishes a dolomite reservoir model and defines the spatial relationship between reservoir parameters and lithofacies architecture. The following insights are obtained: (1) The 4th member of the Dengying Formation in Ningqiang area can be divided into lower, middle, and upper sub-members, forming a shallowing-upward cycle from middle ramp to weakly rimmed platform margin to strongly rimmed platform margin. The main rock types are microbial dolomite and crystalline dolomite, with microbial dolomite being the dominant type, including algal peloidal dolomite, algal stromatolite dolomite, algal laminated dolomite, algal framework dolomite, and algal thrombolite dolomite. The upper sub-member develops typical platform-margin (algae) mound-shoal complexes, in which algal framework dolomite, algal stromatolite dolomite, and algal thrombolite dolomite have porosity > 4.5%; algal peloidal dolomite and fine-crystalline dolomite have porosity between 2.5% and 3.5%. Toward the interior of the platform, algal laminated dolomite, very fine-muddy crystalline dolomite have porosity < 2.5%. (2) The reservoir spaces in algal framework dolomite and algal thrombolite dolomite are characterized by large pores and throats; those in algal stromatolite dolomite, algal peloidal dolomite and fine-crystalline dolomite are characterized by medium-sized pores and throats; and those in algal laminated dolomite, very fine-muddy crystalline dolomite are characterized by small pores and throats, exhibiting a dual pore-throat structure. (3) The stacking pattern of the lithofacies is clear: algal peloidal dolomite and fine-crystalline dolomite represent clastic shoal deposits in the mound base and inter-mound areas; algal stromatolite dolomite represents deposits during the colonization stage of microbial mounds above the mound base; algal framework dolomite represents mound core construction; and algal thrombolite dolomite represents mound-flank deposits, exhibiting a "small mound, large shoal" pattern. These results indicate that the platform-margin mound-shoal complex in the upper sub-member of the 4th member of the Dengying Formation in northern Sichuan Basin is extensively developed, representing a favorable zone for high-quality reservoir development.