Formation Mechanisms and Distribution Law of Effective Volcanic Reservoirs -- Taking Carboniferous Volcanic Reservoirs in Malang Depression of Santanghu Basin as an Example

Abstract

The understanding of the formation mechanisms of volcanic reservoirs can provide a reference for the distribution law of effective volcanic reservoirs and oil and gas reservoirs, and has an important guiding role in accelerating the pace of the exploration and development of volcanic reservoirs. Using the data of three-dimensional seismic interpretation, logging, core description and thin section identification, it is concluded that the formation of volcanic reservoirs in Santanghu Basin was controlled by many factors such as tectonics, lithology, lithofacies, fluids, volcanic apparatus, weathering and leaching, including fault rebuilt, unconformity, alkali metasomatism, dissolution, weathering and leaching and other formation mechanisms, 5 types of reservoir formation models are obtained according to the different superimposition modes of the depth mechanism for the formation of volcanic reservoirs in different periods, and five types of distribution law of effective volcanic oil and gas reservoirs are summarized from the understanding of reservoir types, accumulation models, and accumulation mechanisms. The study provides a reference for the prediction of effective volcanic reservoirs, and further defines the exploration direction of volcanic oil and gas reservoirs.