济阳坳陷前第三系油气勘探前景

济阳坳陷前第三系发育下古生界碳酸盐岩、上古生界煤系、中生界侏罗系煤系3套烃源岩系。其中,上古生界煤系最好。因此,济阳坳陷前第三系自生自储型油气藏应以勘探天然气为主,层系上以上古生界含气系统为主,兼探中生界含油气系统。孤北古1气藏的地质特征及成藏过程表明,上古生界自生自储天然气藏成藏有赖于深凹区存在较厚的上古生界烃源岩、大型构造背斜圈闭背景和良好的生储盖配置。经有利生烃区分布、储层及盖层条件和圈闭类型等因素评价,济阳凹陷上古生界的7个有利勘探区带分别为沾化凹陷的孤北、孤南、罗家和郭局子、东营凹陷的金家和林樊家以及车镇凹陷的车西;4个较有利区带分别为沾化凹陷的埕东和义南、东营凹陷的南坡和惠民凹陷南坡。

Potential of petroleum exploration in pre-Tertiary in Jiyang depression

Three pre-Tertiary source rock sequences are developed in Jiyang depression, including Lower Paleozoic carbonates, Upper Paleozoic coal measures and Mesozoic Jurassic coal measures, of which the Upper Paleozoic coal measures are the best. Therefore, gas reservoirs that have been generated and reservoired indigenously should be taken as the main targets of exploration in pre-Tertiary in Jiyang depression. Focus should be put on the Upper Paleozoic petroleum system, with considerations being given to Mesozoic petroleum system. The geologic features and reservoiring history of Gu - 1 gas reservoir in Gubei area indicate that formation of gas reser- voirs characterized by being generated and reservoired indigenously has largely depended on the development of the Upper Paleozoic source rocks, large anticlinal traps and good timing of source-reservoir-cap rocks in the deep sag area. Comprehensive evaluation of the distribution of favorable source rocks, reservoir and seal conditions and trap types indicates that there are 7 favorable exploration prospects in the Upper Paleozoic in Jiyang depression, including Gubei, Gunan, I,uojia and Guojuzi in Zhanhua sag, Jinjia and Linfanjia in Dongying sag, and Chexi in Chezhen sag, and 4 less favorable prospects, including Chengdong and Yinan in Zhanhua sag and southern slopes of both Dongying and Huimin sags.