黄海新生代构造及油气勘探前景

Cenozoic Tectonics of the Yellow Sea and Its Oil-Gas Exploration

黄海构造是地质领域重要的研究课题，尤其是南黄海油气勘探工作虽然经过了30多年的研究与勘探，但至今仍进展不大；因此，如何突破该区油气勘探的难题引起普遍关注。黄海地区在新生代经历过2次近南北向的缩短与挤压（135～52Ma，23～0．78Ma）和2次近东西向的缩短与挤压（52—23Ma，0．78Ma-）。新生代的4个构造期对于油气资源的形成、运移和保存产生了重大的影响。白垩纪-古新世是形成盆-山体系的雏型时期，始新世-渐新世（52～23Ma）是生油层形成的主要时期，中新世一早更新世（23～0．78Ma）的构造作用使NNE向的先存断裂成为油气运移的良好通道，中更新世以来（0．78Ma-）近东西向的挤压使NNE向的断层闭合，为油气的保存创造了良好的条件。建议大力加强南黄海地区NNE向的先存断裂与古近系相交部位及其上部的油气勘探工作。

To study the tectonics of the Yellow Sea is the common concern project. Although the oil-gas exploration has undergone more than 30 years in South Yellow Sea, the exploration progress of that is not successful. There are two nearly N-S trending shortening and compression epochs （135 -52 Ma and 23 -0. 78 Ma） and two nearly E-W trending shortening and compression stages （52 -23 Ma and 0. 78 Ma - ） at the Yellow Sea and its adjacent areas during Cenozoic. Four tectonic epochs during Cenozoic have important influences on forming, migrating and preserving oil-gas reservoirs. An embryonic form of the basin-range framework occured in Cretaceous and Paleocene （135 -52 Ma）, and Eocene-Oligocene （52 -23 Ma） is the main forming epoch for oil-gas source. During Miocene-Early Pleistocene （23 -0. 78 Ma）, tectonism caused favorable passage for oil-gas migration along NNE trending faults. Since Middle Pleistocene （0. 78 Ma - ） the NNE trending faults are closed and make a good condition for reservation of oil-gas, controlled by E-W trending shortening. The authors suggest to pay more attentions to the oil-gas exploration at the intersections between NNE trending existing faults and Eocene-Oligocene systems, and also pay attentions to the upper parts in South Yellow Sea area.