河套盆地临河坳陷新生界油源对比及其勘探意义
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摘要
河套盆地临河坳陷勘探程度低,早期未取得油气实质性发现,近期石油勘探取得重大突破,S5井、Jh2X井在古近系渐新统临河组试油分别获得62.6m~3/d和10.26m~3/d的高产工业油流。为了剖析S5井、Jh2X井原油的油源关系,确定今后的勘探目标,对原油与烃源岩开展系统的有机地球化学分析。S5井、Jh2X井原油为低成熟—成熟原油,总体反映出高盐、厌氧的咸水湖泊沉积环境。下白垩统固阳组与渐新统临河组烃源岩为咸水湖相烃源岩,部分烃源岩处于低成熟—成熟阶段,有机质丰度高、母质类型好、生烃潜力大。油源对比结果显示S5井原油来自临河组烃源岩,Jh2X井原油可能来自于固阳组成熟烃源岩。临河坳陷油气资源丰富,具备良好的勘探潜力,固阳组与临河组是主要勘探目的层。
Linhe depression in the Hetao Basin has been less explored. No significant oil and gas discoveries were made until some breakthroughs recently. Wells S5 and Jh2X delivered commercial oil flows of 62.6 m~3/d and 10.26 m~3/d, respectively, from Oligocene Linhe Formation during the production tests. In this study, the correlation between oil and source rock of Wells S5 and Jh2X was systematically analyzed from prospective of organic geochemistry, in order to determine the oil-source correlation and thereby facilitate the selection of exploration targets. Crude oil in Wells S5 and Jh2X is less mature to mature, generally reflecting the characteristics of a high-salinity and anoxic lacustrine environment. The source rocks in Lower Cretaceous Guyang Formation and Oligocene Linhe Formation are saline lacustrine facies, and less mature to mature locally with abundant organic matters, good kerogen types and high hydrocarbon-generating potential. The oil-source correlation reveals that the oil in Well S5 was originated from the source rock in Linhe Formation, and the oil in Well Jh2X might derive from the mature source rock in Guyang Formation. In conclusion, Linhe depression has a good exploration potential for its rich oil and gas resources, with Guyang and Linhe Formations as the key exploration targets.
Linhe depression in the Hetao Basin has been less explored. No significant oil and gas discoveries were made until some breakthroughs recently. Wells S5 and Jh2X delivered commercial oil flows of 62.6 m~3/d and 10.26 m~3/d, respectively, from Oligocene Linhe Formation during the production tests. In this study, the correlation between oil and source rock of Wells S5 and Jh2X was systematically analyzed from prospective of organic geochemistry, in order to determine the oil-source correlation and thereby facilitate the selection of exploration targets. Crude oil in Wells S5 and Jh2X is less mature to mature, generally reflecting the characteristics of a high-salinity and anoxic lacustrine environment. The source rocks in Lower Cretaceous Guyang Formation and Oligocene Linhe Formation are saline lacustrine facies, and less mature to mature locally with abundant organic matters, good kerogen types and high hydrocarbon-generating potential. The oil-source correlation reveals that the oil in Well S5 was originated from the source rock in Linhe Formation, and the oil in Well Jh2X might derive from the mature source rock in Guyang Formation. In conclusion, Linhe depression has a good exploration potential for its rich oil and gas resources, with Guyang and Linhe Formations as the key exploration targets.
引文
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