柴达木盆地德令哈断陷石油地质特征及勘探前景

PETROLEUM GEOLOGIC CHARACTERISTICS AND EXPLORATION PROSPECT OF THE DELINGHA FAULT-DEPRESSION IN THE QAIDAM BASIN

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4 000 m,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。

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 sand stone 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.