东北石油大学学报2025，Vol.49Issue(6)：16-31,16.DOI:10.3969/j.issn.2095-4107.2025.06.002
巴中地区凉高山组湖相页岩储层孔隙特征及控制因素
Pore characteristics and controlling factors of lacustrine shale reservoirs in the Lianggaoshan Formation,Bazhong Area
摘要
Abstract
The Lianggaoshan Formation in the Bazhong Area of the Sichuan Basin is a key target for shale oil and gas exploration.Focusing on the lacustrine shale reservoir of the Lianggaoshan Formation,a classification system for shale lithofacies in the study area was established based on core analysis,thin-section observations,and XRD mineral data.Methods such as scanning electron microscopy and low-temperature N2 adsorption experiments were employed to investigate pore types and size distribution,as well as to discuss pore characteristics and controlling factors.The results indicate that three lithofacies types were identified in the lacustrine shale of the study area:medium-high carbon laminated silty shale,low-carbon medium-thick layered mixed mudstone,and carbon-bearing medium-thick layered silty shale.The medium-high carbon laminated silty shale lithofacies exhibits the best physical properties,while the carbon-bearing medium-thick layered silty shale lithofacies shows the poorest.The main pore types include inter-clay mineral pores,dissolved feldspar grain pores,organic pores,and a small number of micro-fractures.Pore sizes are predominantly mesoporous,with macropores being the least abundant and micropores falling between the two.The physical properties of the shale reservoir in the study area are controlled by the coupling of multiple factors.Lithofacies and sedimentary environment determine the quality of primary pore development,with reservoirs featuring laminated structures and high clay mineral content exhibiting the best physical properties.Organic matter type and thermal maturity deter-mine the development of organic pores,where high thermal maturity facilitates the formation of second-ary organic pores.Compaction and cementation during early diagenesis damage the pore structure,while organic acid dissolution and clay mineral transformation during middle diagenesis provide key conditions for reservoir space improvement.These findings offer guidance for the exploration and development of lacustrine shale in the Sichuan Basin.关键词
四川盆地/巴中地区/凉高山组/页岩/岩相划分/储层物性/控制因素Key words
Sichuan Basin/Bazhong Area/Lianggaoshan Formation/shale/lithofacies classification/reservoir physical properties/reservoir controlling factors分类
能源科技引用本文复制引用
解祎恬,胡明毅,魏思乐,邓庆杰,罗浩渝..巴中地区凉高山组湖相页岩储层孔隙特征及控制因素[J].东北石油大学学报,2025,49(6):16-31,16.基金项目
国家科技重大专项(2025ZD1400205) （2025ZD1400205）
