新疆三塘湖盆地沉积成岩作用研究

目的了解中国西部叠合型含油气盆地的储集岩类型及其成岩作用特点。方法针对三塘湖盆地不同程度的叠加改造特点，开展盆地尺度上储层成岩作用的整体分析。结果二叠纪裂谷盆地的成岩强度大，以机械压实作用为主，原生孔隙丧失多且早，晚期成岩作用较重要，裂缝是油气运聚的通道和空阀，可出现次生孔隙发育带；三叠纪-古近纪拗陷盆地的成岩作用表现为机械压实和化学压实作用并重，原生孔隙多被保留；晚海西、印支、燕山运动等表生成岩阶段对该区的成岩演化和油气运聚起到重要作用；二叠系中特征的泥云岩和藻云岩可能是在有淡水注入的较高盐度湖泊中经混合作用而形成的。结论三塘湖盆地二叠纪-古近纪的成岩作用特点可作为中国西部叠合型含油气盆地的储集岩成岩作用的代表。

A study on sedimentary diagenesis in Santanghu Basin in Xinjiang

Aim To better understand the types of reservoir and traits of diagenesis of the superimposed petroliferous basin in the west of China. Methods Aiming at different degree superposing and rebuilding characteristics of Santanghu Basin, the reservoir diagensis is completely analyzed in basin scale. Results The diagenetic grade of Permian rift basin was quite high, and the mechanical compaction resulted in the great loss of the original pore.The eodiagenesis and telodiagenesis were important to the reservoir, and fractures were the dominant hydrocarbon migrating pathway and accumulating space; In Triassic-Paleogene Formation, mechanical compaction was as important as pressolution, and the most original pore was preserved. The exodiagenesis stage of late hercynian movement, indosinian movement and Yanshan movement played the vital role in the diagenetic evolution and hydrocarbon migration and accumulation of the basin. The argillaceous dolomite and algal dolomite discaved in Permian, which were formed probably by hybrid process in high salinity lake which had the fresh water interfused in. Conclusion The traits of diagenesis of Permian to Lower Tertiary in Santanghu Basin can be regarded as representative of the superimposed petroliferous basin in west of China.