Abstract
Although a large number of meandering rivers have been studied by means of modern sedimentation, instrument detection, numerical simulation, flume experiment and field outcrop, and a lot of achievements have been made, there are not many fine anatomical examples of deep buried ancient rivers, which is a situation that still needs to be improved. The main difficulties in the research of deep, ancient meandering rivers are the acquisition of data and the incompleteness of structure, which are both difficulties and challenges. Under the guidance of the modern meandering river fan sedimentary model and migration law, we established the scheme of meandering river geomorphology and structure. In the process of river migration, a variety of single migration models (expansion, contraction, rotation, and translation) and composite migration models can be distinguished. By analyzing the distribution structure characteristics of channel configuration elements in different migration modes, the coupled model of the meandering channel plane and profile structure is established by systematically constructing plane and profile combined with a three-dimensional channel configuration model. Based on the data of the dense well, taking the Shan 11 sublayer in the Su-x block of the Sulige gas field as an example, the reservoir structure of the deep, ancient meandering channel is dissected. In order to reconstruct the evolution of the deep, ancient channel and make it more consistent with the real laws of river migration and evolution, the morphological migration law of the modern river is applied to the ancient sedimentation, and the migration configuration is dissected by combining with the plane-profile structure coupled model. It further reveals the heterogeneity, the vertical distribution and the superposition form of the channel sand, and enriches the theory of the reservoir configuration of underground fluvial facies, all of which are significant for oil and gas exploration and development.
Highlights
With continuous exploration and development, most of the domestic oilfields are in the stage of high water cut, and the focus of reservoir research controlled by rivers is shifted to the reservoir heterogeneity
River migration is affected by hydrology, hydrodynamics, sediment transport, geomorphology, climate, human and animal activities [1,2,3,4], which are not controlled by the river [5], and lead to the diversity of river morphology
According to the characteristics of the deposition cycles and lithological composition, it can be subdivided into Shan 2 (S2) and Shan 1 (S1) from bottom to top
Summary
With continuous exploration and development, most of the domestic oilfields are in the stage of high water cut, and the focus of reservoir research controlled by rivers is shifted to the reservoir heterogeneity. The morphology and migration evolution of the meandering river are always a focus of research. Despite vast amounts of research into modern rivers, with relatively mature and perfect theory, the migration model of paleochannel sediments cannot be well inferred and revealed due to the deep buried morphology and small outcrops [29,30]. The basin is a secondary structural unit of the North China Craton, with stable subsidence, depression migration and torsion. Stratigraphic development in the upper Paleozoic Permian of the Ordos Basin, including Shanxi Formation (P1s), lower Shihezi Formation (P2x), upper Shihezi Formation (P2s) and Shiqianfeng Formation (P2sh). The sedimentary environment is mainly fluvial-lacustrine facies during the Permian period [39], while Shanxi Formation developed a shallow braided river delta
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