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中国大陆地壳的核心──中国地台区是全球九大地台区中面积最小的一个,是唯一一个东西延伸的地台,是在整个地球发展史中始终受挤的陆壳。侏罗纪以来,由于太平洋板块的生成,中国大陆岩石圈处于四面受挤的地球动力环境中,使中国陆壳成为新构造运动最活跃的陆壳,中国西部成为新构造运动最活跃的地区。从而,使中国西部含油气盆地地表油气苗发育;可能具有有机成因与无机成因油源;商业油气层出现在膏盐层与铝土矿层等好的盖层之下,油气田多沿活动断裂分布;表明与东部含油气盆地油气田受生油区控制的源控型含油气系统不同,表现为保技型含油气系统。因此,油气勘探原则也应有别于东部,应采用“沿着盆地(隆起)边缘钻探,占高点、打屋脊,地面显示是导引”的办法,可能是投入少而效果好的勘探原则。
The core of China’s crust - China’s platform area is the smallest of the nine major meridional areas in the world. It is the only platform that extends from east to west and is a crust that has been squeezed throughout the Earth’s history. Since Jurassic, due to the formation of the Pacific plate, the lithosphere in mainland China is in a four-sided crowded geodynamic environment, making the continental crust of China a most active continental crust of the Neotectonic movement. The western part of China has become the most active area of the Neotectonic movement. Thus, the development of oil and gas on the surface of oil and gas bearing basins in the west of China may have organic genesis and inorganic genesis. Commercial hydrocarbon reservoirs occur under the cap rocks such as gypsum and bauxite, and are distributed along active faults It is indicated that, unlike the source-controlled petroleum system controlled by the source-oil zone in the eastern oil-gas-bearing oil and gas field, it is characterized by the Bao-technical petroleum system. Therefore, the principle of oil and gas exploration should also be distinguished from the eastern part. The principle of “drilling along the edge of a basin (uplift), taking up high spots, hitting ridges and guiding the ground should be adopted” may be the exploration principle of less effective investment .