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以沉积盆地沉积波动过程分析方法为理论指导,对黔中隆起及其周缘地区7个典型野外地质观测剖面震旦—石炭系沉积-剥蚀过程进行了系统分析和预测,对地层因不整合所造成的剥蚀厚度进行恢复,研究表明区内不同构造单元的沉积-剥蚀过程35Ma,20Ma的高频波动周期,定量恢复了下中奥陶统顶部、下中志留统顶部不整合剥蚀量分别为100m~540m和100m~390m。黔中隆起及周缘地区2个主要不整合呈现近西向-近北东方向和近南北向的剥蚀叠加,再现了关键时期沉降沉积区和隆起剥蚀区区域分布规律。综合分析认为不整合对盖层的影响是该区油气成藏的主要控制因素,预测盖层有利区域主要分布于黔中隆起西北部和滇黔北部坳陷。
Taking the analytical method of sedimentary fluctuation in sedimentary basin as theoretical guidance, the sedimentary-denudation process of the Sinian-Carboniferous sedimentary-denudation of seven typical field observation sections in the central Guizhou uplift and its surrounding area was systematically analyzed and predicted. For the unconformity of the strata The results show that the periods of high frequency fluctuation during 35Ma and 20Ma of depositional-denudation processes of different tectonic units in the area recover quantitatively to the top of the Lower Middle Ordovician. The unconformity erosion at the top of the Lower Middle Silurian is 100m ~ 540m and 100m ~ 390m. The two major unconformities in the Qianzhong uplift and its periphery show a superimposed denudation over the near-west-near-northeast and near-north-northeast, and the regional distribution of sedimentary and uplifted denuded regions is reproduced. The comprehensive analysis shows that the influence of the unconformity on the caprock is the main controlling factor of hydrocarbon accumulation in the area, and the favorable area of the caprock is predicted to be mainly distributed in the northwest of the central Guizhou uplift and the depression of northern Yunnan and Guizhou.