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柴达木盆地中南部处于盆地西部第三系含油气系统和盆地东部第四系含油气系统之间 ,第三纪接受了巨厚的湖相沉积。该区具备有利的构造圈闭、泥岩盖层条件 ,烃源岩以E23 —N1为主 ,累计厚度大于 2 0 0 0m ,具备一定的资源潜力。与盆地西部油田区相比 ,该区烃源岩厚度变薄、有机质丰度降低、埋藏深度大 ,有机质热演化多已进入高成熟阶段 ,砂岩储集层不发育、物性差 ,是制约油气成藏的不利条件。柴达木盆地中南部地区勘探应以找气为主、找油为辅 ,寻找构造裂缝为主的裂缝性储集层是取得勘探突破的一个关键环节。位于甘森湖凹陷边缘的土疙瘩构造是一个可以进行重点评价的目标。图 5表 2参 4
The central-southern Qaidam Basin is between the Tertiary petroliferous system in the western part of the basin and the Quaternary petroliferous system in the eastern part of the basin. The Quaternary accepted thick deposits of lacustrine sediments. This area has favorable structural traps and caprock caprock conditions. The source rocks are mainly E23 -N1 with a total thickness of more than 2000 m, which has certain resource potential. Compared with the oilfields in the western part of the basin, the thickness of source rocks in this area is thinner, the abundance of organic matter decreases, the burial depth is large, and the thermal evolution of organic matter has already entered the mature stage. The sandstone reservoirs are not developed and have poor physical properties. Negative conditions of possession. The exploration of central and southern Qaidam basin should be mainly gas-seeking and oil-seeking. Looking for fractured reservoirs with structural fractures is a key link in the exploration breakthrough. The earth-lump structure located at the edge of the Sagamono Sag is a goal that can be critically evaluated. Figure 5 Table 2 Reference 4