四川地质学报

川中地区下三叠统嘉陵江组为一套克拉通陆表海台地相沉积，目前已有多口井获得油气发现，但至今未实现规模性突破。已有的钻井揭示，嘉陵江组白云岩储层属于典型的薄储层，目前对其沉积模式与发育分布规律仍不明确，影响了勘探部署。为了进一步明确川中地区嘉陵江组五段储层的相控规律，基于岩心观察、薄片鉴定、测井解释等，详细分析了嘉陵江组五段沉积相和储层特征。结果表明：(1)川中地区嘉陵江组五段储层的岩石类型主要为颗粒白云岩及晶粒白云岩，储集空间以残余粒间孔、晶间(溶)孔为主；(2)川中地区嘉陵江组五段储层主要发育于嘉五段下部，为潮坪与潮间带颗粒滩多期叠置的发育模式，具备发育滩相储层的条件；(3)嘉五¹段储层之上为海平面下降背景下形成的广泛分布的蒸发岩，与下部滩相构成良好的储-盖组合；(4)川中地区嘉陵江组五段的古地理重建揭示川中嘉五段沉积期发育南北向的中央低隆带，滩相白云岩储层沿低隆带两侧发育，具有良好的勘探前景。

The Lower Triassic Jialingjiang Formation in the central Sichuan Basin is a set of craton continental surface sea platform facies. Currently, many Wells have yielded oil and gas discoveries, but no large-scale breakthrough has been achieved. Existing drilling has revealed that the dolomite reservoirs of the Jialingjiang Formation are typical thin reservoirs. The sedimentary patterns and development and distribution patterns of these reservoirs remain unclear, which has affected the exploration deployment. In order to further clarify the facies-controlled laws of the reservoirs in the Fifth member of the Jialingjiang Formation in the central Sichuan Basin, the sedimentary facies and reservoir characteristics of the Fifth member of the Jialingjiang Formation were analyzed by detailed core observation, thin section identification, and well logging interpretation. The results show that:(1) The lithology of the reservoirs in the Fifth member of the Jialingjiang Formation in central Sichuan is mainly granular dolomite and granular dolomite, and the reservoir space is mainly composed of residual intergranular pores and intergranular(dissolved) pores.(2) The reservoirs are mainly located in the lower part of the Fifth member of the Jialingjiang Formation, featuring multi-stage granular beach superposition from the tidal flat to the intertidal zone, which provides conditions for the development of beach facies reservoirs.(3) Above the Fifth member of the Jialingjiang Formation, evaporative rocks are widely distributed during the period of sea level drop, forming a good reservoir cap combination with the lower beach facies.(4) Paleogeographic reconstruction indicates that during the sedimentary period of the Fifth member of the Jialingjiang Formation, a north-south central low-uplift zone developed, and beach facies dolomite reservoirs developed along both sides of it, indicating a good exploration prospect.