辽宁省红庙子盆地烃源岩特征与生烃潜力研究——来自红地1井的证据

红庙子盆地是松辽外围东南部中生代沉积盆地之一，其油气基础地质研究程度极低，盆地内部烃源岩类型和有机地化特征及生烃潜力等均未知，制约着盆地油气资源研究和勘探部署。依据新近部署的红地1井钻探成果，系统采集岩心样品，进行了暗色泥岩有机质丰度、类型和成熟度测试。盆地内烃源岩主要由下白垩统下桦皮甸子组的黑色泥岩、粉砂质泥岩组成，黑色泥岩累计厚度101.16 m，单层最厚24.85 m，发现油气显示50层。实验结果表明，该区下桦皮甸子组烃源岩有机质丰度中等，类型以Ⅱ₂-Ⅲ型为主，局部含有Ⅱ₁和Ⅰ型；镜质体反射率为1.31%~1.84%，平均值1.53%，已进入高成熟阶段。扫描电镜分析揭示，该烃源岩矿物成分由黏土和脆性矿物组成，平均含量分别为58.4%和41.4%；泥晶间微孔隙发育，有利于储集空间和运移通道的改善，便于后期人工造缝，具有油气聚集和运移的成藏条件。综合研究认为，红庙子盆地烃源岩具有一定的生油气潜力，亟需持续深入地开展研究工作。

Features and hydrocarbon potential of source rocks in the Hongdi 1 well,Hongmiaozi Basin,Liaoning province

The Hongmiaozi Basin is one of the newly-identified Mesozoic sedimentary basins in the southeastern segment of the periphery of Songliao Basin. The degree of basic oil and gas geology research in the Hongmiaozi Basin is extremely low. The source rock types, organic geochemical features and hydrocarbon generation potential in the basin are unknown, which constrains the exploration and development of oil and gas resources in the basin. Based on the new drilling results of well Hongdi 1, some core samples were collected and tested for organic matter abundance, type and maturity of dark mudstone. The source rocks in the study area are mainly composed of black mudstone and silty mudstone in the Xiahuapidianzi Formation, Lower Cretaceous. The dark mudstone has a cumulative thickness of 101.16 m, and the single thickest layer is 24.85 m, finding fifty layers with oil and gas shows. The experimental results showed that source rocks of the Xiahuapidianzi Formation in the Hongmiaozi Basin have a medium organic matter abundance. The types of organic matter are mainly Ⅱ₂-Ⅲ, partly Ⅱ₁ and Ⅰ. The vitrinite reflectance ranges from 1.31% to 1.84%, with an average of 1.53%, indicating for a high maturity stage. Scanning electron micro-scopy analysis revealed that the mineral composition of source rocks consisted of clay and brittle minerals with average contents of 58.4% and 41.4%, respectively. Microporosity developed between muddy crystal grains, which is conducive to the improvement of storage space and migration channels, and to facilitate late artificial fracturing. The study showed that source rocks in the Hongmiaozi Basin have some potential for hydrocarbon generation, and there is an urgent need for continuous and intensive research.