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南方地质条件有四方面的特点:碳酸盐岩区与特提斯域有关,具有良好的含油气前景;叠置在碳酸盐岩区上的南、北两大前陆盆地带,对古生界原型盆地烃源岩的演化、油气藏形成和保存起到重要作用;南方海相地层具有丰富的烃源岩;后期多旋回构造运动,使南方海相油气系统变得十分复杂。南方油气选区评价的关键是保存条件,在含油气系统中“保存单元”是优选勘探目标的重要依据。“九五”期间,一要主攻中、下扬子区,获重大突破;二要积极做好滇黔桂地区三个盆地(南盘江盆地、楚雄盆地、十万大山盆地)的预探;三要进一步搞好区域评价。
The southern geological conditions have four characteristics: the carbonate area is related to the Tethyan area and has a good prospect for oil and gas. The southern and northern foreland basins superimposed on the carbonate area are characterized by ancient The evolution of source rocks in Proterozoic basins, and the formation and preservation of oil and gas reservoirs play an important role. The southern marine strata have rich source rocks. In the later multi-cycle tectonic movement, the marine systems in the southern China become very complicated. The key to the evaluation of the southern oil and gas constituency is the preservation condition. The “preservation unit” in the petroleum system is the important basis for the optimization of the exploration target. During the Ninth Five-Year Plan period, major breakthroughs should be made in the middle and lower Yangtze areas; secondly, the pre-exploration of three basins in Yunnan, Guizhou and Guangxi (Nanpanjiang Basin, Chuxiong Basin and Shiwandashan Basin) We must further improve the regional assessment.