北黄海盆地生烃条件研究

截至1997年底，朝鲜已在北黄海盆地内钻井15口，并在中生代地层中发现了油气流，显示了该区良好的勘探前景。为此研究了该盆地的生烃条件，结果认为：①北黄海盆地是由历经古生代、中生代和新生代3个主要演化阶段的各种原型盆地叠加而成的小型多旋回盆地；②盆地的形成演化主要经历了震旦纪-二叠纪盆地基底形成阶段、中生代断陷发育阶段、古近纪叠加断陷阶段和新近纪坳陷阶段；③盆地主要在隆起背景上由3个坳陷和众多小断陷组成，其内发育了一套中生代以来、最大沉积厚度超过8 000 m的海相-海陆过渡相、河湖-三角洲相沉积，具有多期优越的成烃环境，为烃源岩的发育奠定了良好的物质基础；④中生代和古近纪是北黄海盆地烃源岩发育的最有利时期，盆地主要发育了中生界和古近系两套烃源岩；⑤盆地具备生油气的可能性，东部、中部坳陷是盆地油气生成最有利的地区。

A study on hydrocarbon generation conditions in the North Yellow Sea basin

North Korea has drilled 15 wells in the North Yellow Sea basin by the end of 1997 and tested oil and gas flows in the Mesozoic reservoirs, indicating large oil and gas potential in this area. The hydrocarbon generation conditions of this basin are studied and the following understandings are achieved: a. the North Yellow Sea basin is a small multicycle basin formed by a superimposition of the Paleozoic, Mesozoic and Cenozoic prototype basins; b. the evolutionary process of the basin can be divided into four major stages, including formation of the basement in the Sinian Permian, fault subsidence in the Mesozoic, superimposed fault subsidence in Paleogene, and down warping in Neogene; c. the basin is mainly composed of three depressions and many small fault depressions in an uplift setting, and its post Paleozoic sedimentary cover of marine transitional facies and fluvial lacustrine delta facies with a maximum thickness over 8000 m contains several sets of well developed source rocks with favorable hydrocarbon generation conditions; d. the Mesozoic and Paleogene were the most favorable periods for the development of source rocks in the study area, with two sets of source rocks deposited; e. the basin is capable of generating hydrocarbons and the eastern and central depressions are the most favorable hydrocarbon kitchens.