Characteristics and Genetic Mechanism of Pore Throat Structure of Shale Oil Reservoir in Saline Lake—A Case Study of Shale Oil of the Lucaogou Formation in Jimsar Sag, Junggar Basin

The shale oil reservoir of the Lucaogou Formation in Jimsar Sag has undergone tectonic movement, regional deposition and complex diagenesis processes. Therefore, various space types combination patterns pores have developed, resulting an intricate pore throat structure. structure brings great challenges to classification evaluation reservoirs efficient development oil. methods scanning electron microscopy, high-pressure mercury injection, low-temperature adsorption experiments thin-slice analysis were used this study. Mineral, petrology, evolution process characteristics analyzed discussed qualitatively quantitatively. Based on these studies, formation mechanisms different structures revealed, four progressions made. is mainly composed residual intergranular pores, dissolved intercrystalline fractures. Four quantitatively characterized. Furthermore, primary was controlled by a sedimentary environment. throats reduced blocked compaction cementation, which deteriorates physical properties reservoirs. However, dissolution early carbonate, feldspar tuffaceous minerals small amount carbonate cements organic acids are key factors improve genetic model divided into two types. large-pore medium-fine medium-pore medium-throat located delta front-shallow lake facies characterized diagenetic assemblage weak compaction–weak cementation–strong dissolution, medium compaction–medium calcite dolomite cementation–weak dissolution. fine fine-pore developed shallow lakes semi-deep lakes. They type strong compaction–strong diagenesis. This study provides comprehensive understanding mechanism benefits exploration