| 青藏高原油气勘探战略选区和战术突破目标的建议 |
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| 关键词:Tibet hypothesis of one basin between two oldlands Coqen Block Baoji oil-bearing assemblage oil and gas exploration |
| 基金项目:国家自然科学基金项目(编号: 41472030);科技基础性工作专项(编号: 2015FY310100);中国地质调查局基础性公益性矿产地质调查项目(编号: DD20160120-02; DD20160120-04; DD20160126);中国地质科学院基本科研业务费项目(编号: J1607) |
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| Suggestions on the Strategic Selection of Petroleum Target Areas and the Tactic Breakthrough of the Oil and Gas Exploration in the Tibetan Plateau |
| The geological hypothesis of three oldlands separated by two troughs has long been the guiding theory for the oil and gas exploration of the Tibetan Plateau. The core pillar of the hypothesis is that Gangdise region was an oldland (the Gangdise Oldland) during Late Permian to Jurassic. The oldland was interpreted by the argument that the strata of the upper Permian and the Middle–Upper Jurassic are terrestrial facies and the strata of the Triassic and lower Jurassic failed to deposit. However, many marine strata previously thought to be not deposited have been identified by biostratigraphic investigations, which proves that the Gangdise Oldland does not exist actually. The absence of the Gangdise Oldland means that the above hypothesis does not represent the actural aspects of the geological pattern of the Tibetan Plateau. A new hypothesis of one basin between two oldlands is proposed in this paper. This hypothesis is mainly characterized by the argument that marine sediments deposited on the so-called Gandise Oldland. Guge Basin seems to have been the unique marine basin from Paleozoic to Mesozoic in the Tibetan Plateau. The Coqen Block in the Guge Basin had favorable geological conditions to form a large hydrocarbon province because of the existence of the Guge oil-bearing assemblage and the Baoji oil-bearing assemblage. These two assemblages comprise sediments of carbonate platform facies with hydrocarbon shows in the ourcrops and are well preserved by the Cretaceous strata which constitute the main outcrops. The Cretaceous and the strata below were compressed to form compound anticlinal structure by the NS-trending tectonic movement of Late Yanshanian–Himalayan period. The core of the anticline is the favorable structural part of the oil and gas exploration. The anticline structure was tilted to form nose structure by the EW-trending fault later. The structural high point of the nose structure is the target position for oil and gas exploration. The strategic petroleum target area selection in the Tibetan Plateau is suggested to be transferred from the Qiangtang Block to the Coqen Block, and geophysical exploration and drilling verification should be conducted on the identified nose structure in the Baoji area. |
| JI Zhan-sheng,WU Gui-chun,YAO Jian-xin,SUN Qian,SHI Qiu-yuan,HE Ji-fu,LI Hao,LIU Zhen-yu,GUO An-chen,HOU Zhao-shuo,LI Dong-ze.2018.Suggestions on the Strategic Selection of Petroleum Target Areas and the Tactic Breakthrough of the Oil and Gas Exploration in the Tibetan Plateau[J].Acta Geoscientica Sinica,39(4):387-400. |
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