PETROLEUM GEOLOGIC CHARACTERISTICS AND EXPLORATION PROSPECT OF THE DELINGHA FAULT-DEPRESSION IN THE QAIDAM BASIN
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摘要: 柴达木盆地北缘块断带德令哈断陷是一个勘探程度很低的地区。通过野外露头石油地质考察,结合目前钻井、地震资料综合研究认为,区内广泛发育中生界侏罗系和古生界石炭系泥岩、碳酸盐岩和煤系烃源岩,奥陶系泥岩和碳酸盐岩也是较好—好烃源岩;储层发育,中新生界油气储层都为砂岩。德令哈断陷为两凹夹一隆的构造格局,区内构造发育,圈闭类型多样,数量多,面积大,埋藏深度多小于4000m,有利于钻探。预测油气总资源量在10×108t以上,是油气勘探的有利地区,有良好的勘探前景。Abstract: The Delingha Fault-depression in the north margin of the Qaidam Basin is a frontier of petroleum exploration.Combining the field petroleum geologic review on the outcrops with the well and seismic information,the mudstone,carbonate rock and coal-measure hydrocarbon source rocks in the Mesozoic Jurassic and Paleozoic Carboniferous are considered widely developing in the Delingha Fault-Depression.The mudstone and carbonate rock in the Ordovician are also good hydrocarbon source rocks.The sandstone reservoirs developed in both the Mesozoic and the Cenozoic.The Delingha Fault-Depression is of two segs mingle with one uplift in structural framework.In the Delingha Fault-Depression,the tectonics developed and the traps are characterized by various types,large quantities and area as well as burial depth less than 4 000 meters.These are favorable for drilling.The total forecasting oil/gas reserve in this area is above 10 million tons.It is a favorable area for oil and gas exploration,and has well exploration prospect.
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