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综合露头、岩芯、钻测井、地震和古生物多种地质资料,通过地震层序解释、钻测井层序划分以及井震结合等技术手段,建立了松辽盆地梨树断陷下白垩统层序地层格架,将其划分为2个二级层序,6个三级层序(SQ1~SQ6)和16个体系域。研究结果表明:沙河子组和营城组处于盆地快速裂陷期,可容纳空间大,物源强劲,层序发育完整的低位、水进和高位体系域,登娄库组处于裂陷晚期,断裂活动微弱,古地貌平缓,低位体系域不发育;层序呈现南北薄中部厚、东薄西厚的展布特征且边缘地层剥蚀严重,横向差异性大,而纵向上层序演化具有继承性,整体沉积格局类似。层序控制有利砂体富集部位和成藏要素空间配置,梨树断陷下白垩统地层发育4套成藏组合,形成自生自储、上生下储和下生上储三种组合模式。
Based on a variety of geological data such as outcrops, cores, drilling logs, earthquakes and paleontology, through the seismic sequence interpretation, drilling and logging sequence and well-seismic combination techniques, the Lower Cretaceous The sequence stratigraphic framework is divided into two second-level sequences, six third-level sequences (SQ1 ~ SQ6) and 16 systematic domains. The results show that the Shahezi Formation and Yingcheng Formation are in the rapid rifting period of the basin, which can accommodate low, water and highstand systems tract with large space, strong source and complete sequence development. The Denglouku Formation is in late rift stage, The fault activity is weak, the paleogeomorphology is gentle, and the lowstand system tract is undeveloped. The sequence shows the south-north thin and middle thick, thin east-west thickness distribution with serious denudation of marginal formation and large horizontal difference. Similar pattern. Sedimentary enrichment sites and accumulation of space elements are controlled by sequence control. In the Lower Cretaceous stratum of the Lishu Fault Depression, four sets of reservoir assemblages are developed, forming three combination modes of self-generative self-storage, supergeneo-lower storage and lower super-storage.