Physical simulation and tracing of the lateral transport system of carbonate servoirs: a case study of the orvician of lunnan low-uplift in tarim basin, china

Combining geological observation and numerical simulation experiments to study oil and gas migration paths is an effective method to clarify the mechanism of oil and gas accumulation. Moreover, it is also an important technical means to realize oil and gas positioning and improve the success rate of oil and gas exploration. The Lunnan Low-uplift in the Tarim Basin in China is an important oil and gas producing area in the Tarim Basin. Multi-stage karstification has superimposed a large range of high-permeability units in the Ordovician. These high permeability units are the basis for large-scale long-distance lateral migration of oil and gas. In this paper, taking the Ordovician marine carbonate reservoirs in the Lunnan Low-uplift as an example, we systematically studied the lateral conduction system of hydrocarbons in the reservoir and their tracing characteristics, Based on the maximum dynamic model of oil and gas migration, a physical simulation of the Ordovician karst top lateral transport system was performed. The research results show that the main directions of oil and gas migration are the S-N and SE-NW directions, and all kinds of oil and gas reservoirs discovered today are located on the oil and gas migration path. At the same time, we verified the results of the benzothiophene parameters and non hydrocarbon nitrogen compounds parameter migration traces with the physically simulated paths, and identified five main migration paths. The results of migration tracing are consistent with the results of physical simulation of migration path, The results of the study provide a deep insight into the process of oil and gas migration and enrichment in the Lunnan Low-uplift, which enriches the oil and gas enrichment laws and distribution prediction theories of marine carbonate formations.