Lithofacies Types and Quantitative Identification Methods of Reservoirs

Abstract

Taking Xing A Block of Songliao Basin as an example, based on the core data of closed core wells, the sedimentary characteristics and genetic mechanism of its lithofacies are analyzed. It is considered that there are four types of core lithofacies developed in the study area, which are medium fine sandstone facies, siltstone facies, muddy silt facies and mudstone facies. Based on the crossplot recognition technology, the logging quantitative division standard of lithofacies is determined, and the quantitative interpretation chart of lithofacies is established. According to the laboratory analysis and test data, the reservoir quality characteristics of various lithofacies are summarized. The medium fine sandstone facies and siltstone facies are the main reservoirs in the study area with good physical and oil-bearing properties and high oil displacement efficiency; the physical and oil-bearing properties of argillaceous siltstone are poor and the oil displacement efficiency is low; in siltstone and argillaceous siltstone, the degree of water flooding is low and the remaining oil is relatively rich.