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松辽盆地上古生界地层一直被认为是海西期褶皱带或碰撞造山带,长期以来被作为盆地的变质结晶基底而成为油气勘查的禁区。随着近些年来研究进展,提出的盆地深部上古生界具有油气资源前景这一认识的深化,提出了“佳蒙地块”的新认识,改变了对该区传统大地构造观(即褶皱造山带)的认识(王成文等,2008a,b,2009a,b),发现东北地区上古生界以海相沉积为主,并没有遭受强烈区域变质作用。本文结合松辽盆地已有钻井资料、区域构造事件、深大地震剖面、非震地球物理资料的解释成果及盆地周边基岩区上古生界地层厚度,综合标定松辽盆地北部上古生界顶底界面,查明了松辽盆地上古生界总体展布特征,为下一步的油气勘探计划提供理论依据。
The Upper Paleozoic strata in the Songliao Basin have long been regarded as the Hercynian fold belt or collision orogenic belt and have long been used as the metamorphic crystalline basement of the basin to become the restricted area for oil and gas exploration. With the progress made in recent years and the deepening of the understanding that the Upper Paleozoic in the basin possesses the prospect of oil and gas resources, a new understanding of the “Jia Meng Block” has been put forward, changing the traditional tectonics of the area Fold orogen) (Wang et al., 2008a, b, 2009a, b). It was found that the Upper Paleozoic in the northeastern region was dominated by marine sediments and did not suffer strong regional metamorphism. Based on the drilling data, regional tectonic events, deep and deep seismic profiles, interpretation results of non-seismic geophysical data and the thickness of upper Paleozoic strata in the bedrock zone of the Songliao Basin, this paper combines the top and bottom of the Upper Paleozoic in the northern Songliao Basin Interface, the general distribution characteristics of the Upper Paleozoic in the Songliao Basin have been ascertained, which provides a theoretical basis for the next exploration project.