Study on Three-Dimensional Geological Sweet Spot Evaluation of Tight Sandstone Reservoirs Based on Well Logging Data

Abstract

Abstract Tight sandstone oil and gas resources have emerged as a crucial element in the future energy landscape. The primary focus of geological evaluation for the development of tight sandstone reservoirs involves the comprehensive assessment and selection of oil layers with high potential, commonly referred to as 'sweet spots.' This study proposes a geological sweet spot evaluation model for tight sandstone reservoirs, which utilizes eight conventional well logging curve data as samples: crosswave time difference, compressional wave time difference, natural gamma, density, wellbore diameter, phase resistivity, amplitude resistivity, and average neutron porosity. The model applies factor analysis and normalization principles to quantitatively assess the vertical distribution of geological sweet spots within the reservoir. Validation of the model is conducted using exemplar wells. Additionally, the study integrates seismic data with well logging data and employs waveform indication simulation techniques to simulate the stratigraphic parameters of the reservoir. This approach facilitates the establishment of a three-dimensional geological sweet spot evaluation model, enabling the inversion of key parameters of geological sweet spots in the target stratum. Consequently, the model allows for a quantitative assessment of the lateral distribution of geological sweet spots in Block DF11-2.