辽河西部凹陷牛心坨地区沙四段发育大规模砾岩体,受沉积环境影响,不同相带储集性能差异大,制约着该区砾岩油藏深入勘探。为此,综合运用岩心、薄片鉴定、物性测试以及测录井等分析手段,对牛心坨地区沙河街组碎屑岩开展了储层岩石学特征及优质储层主控因素研究。结果表明:牛心坨地区沙四段岩石类型以长石砂岩和岩屑长石砂岩为主,储层孔隙主要由原生孔、次生溶蚀孔和裂缝构成,整体表现为中低孔低渗储层,储层的物性在横向上受沉积作用的控制,纵向上受埋藏深度的控制。综合分析认为,沉积作用、埋深和断裂是研究区优质储层的主控因素,扇三角洲前缘为有利储集相带,是下步勘探的重点区域。研究结果对牛心坨地区及同类凹陷的深入勘探具有一定指导意义。
Large-scale conglomerate bodies are developed in the fourth member of the Shahejie Formation in the Niuxintuo Area of the western Liaohe Sag. Influenced by the depositional environment, the reservoir performance of different facies varies greatly, which restricts the in-depth exploration of conglomerate reservoirs in this area. To this end, the petrological characteristics of the reservoir and the main controlling factors of the high-quality reservoir were studied for the clastic rocks of the Shahejie Formation in the Niuxintuo Area using a combination of core, thin section identification, physical property testing and logging and other analytical methods. The result shows: The rock types of the fourth member of the Shahejie Formation in the Niuxintuo Area are dominated by feldspar sandstone and lithic feldspar sandstone, and the reservoir pores are mainly composed of primary pores, secondary dissolution pores and fractures. The reservoir is generally a medium-low porosity and low-permeability reservoir. The physical properties of the reservoir are controlled laterally by deposition and longitudinally by burial depth. The comprehensive analysis shows that sedimentation, burial depth and fracture are the main controlling factors of the high-quality reservoir in the study area, and the front edge of the fan delta is a favorable reservoir facies zone, which is the key area for the next step of exploration. The research results have certain guiding significance for the in-depth exploration of the Niuxintuo Area and similar sags.
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