Formation and tectonic evolution of Laoshan uplift of South Yellow Sea basin and its effect on hydrocarbon accumulation
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摘要: 利用近几年新取得的钻孔资料及地震资料，对崂山隆起的地层发育、构造演化进行了分析，并与下扬子陆区的苏南地区、浙西地区进行了对比。结果表明，崂山隆起有2个主要发育期，第1期为晚震旦世至中奥陶世，第2期为早三叠世；在这2个时期内，崂山隆起形成了以台地相为主的沉积，而浙西地区形成了深水盆地相沉积；晚奥陶世至志留纪期间是崂山隆起的构造加强期，中、新生代为崂山隆起的整体抬升期。崂山古隆起的形成一方面在该区形成了较厚的台地相白云岩等储层，为该区的油气富集提供了储集空间，另一方面继承性发育的古隆起为构造高部位，有利于周缘深水盆地或裂陷槽中形成的烃类向隆起区圈闭中运移成藏，有利于在崂山隆起形成大型油气田。Abstract: Based on the newly acquired drilling data and seismic data, comprehensive study has been devoted to the stratigraphic and tectonic evolution of the Mesozoic-Paleozoic on the Laoshan uplift in the South Yellow Sea Basin, and comparison is made with southern Jiangsu Province and western Zhejiang Province in the land area of the Lower Yangtze platform. It is revealed that there are two depositional stages, the first stage from late Sinian to early Ordovician, and the second stage of early Triassic, dominated by carbonate platform deposits consisting of limestone and dolomite, while deep water deposits of mudstone and argillaceous limestone occur in the western Zhejiang Province. During the period from Late Ordovician to Silurian, tectonic movement became intensified. The Laoshan uplift rose as a whole in Mesozoic and Cenozoic. At the same time, thicker dolomite reservoirs were formed, which provided large space for hydrocarbon accumulation. The uplift formed in the early stage favored the migration of hydrocarbons upwards from the deep water basin or aulacogen and finally accumulated in the traps of the uplifted area.
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图 3 崂山隆起剖面b显示滑脱面
(位置见图 1)
Figure 3. The detachment surface passing through of Laoshan uplift on section b
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图 5 崂山隆起早奥陶世沉积相略图
Figure 5. Sedimentary faces map of Early Ordovician in Laoshan uplift
表 1 南黄海-苏南-浙西北地区中、古生界地层及岩相对比
Table 1 Comparison of Mesozoic and Paleozoic stratigraphic systems among the South Yellow Sea, South of Jiangsu and northwestern Zhejiang
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