云南新生代断陷盆地的环境地质记录

盆地的环境地质记录是从盆地的形成、发展演变、沉积物形成的地球化学与古气候环境、沉积物堆积后所经历的压实、成岩来加以研究的。除无机介质(矿物)外的有机质,在成岩压实受热过程中化学成分与结构的变化,也是盆地环境地质记录的一部分,环境地质研究的归宿是对矿产—化石燃料形成与潜能的估价,完整的研究应该包括化石燃料形成(成烃成煤)环境及成藏(保存)环境等。对云南滇西陇川、瑞丽及保山等三个新生代断陷盆地环境地质记录的研究揭示,在极其相似的盆地形成演变、沉积地球化学与古气候、成岩与成烃背景基础上,化石燃料的形成与潜能在三个盆地具有差异性;指出陇川盆地以找寻煤型气及初熟(低熟)油为主,保山盆地以寻找浅部生物成因气及煤型气为主,瑞丽盆地相对潜能较差,仅有生物气浅部产出的可能。

ENVIRONGEOLOGICAL RECORDS OF THE FAULT BASINS OF THE CENOZOIC IN YUNNAN PROVINCE

Studying environgeological records of continental basins includes commonly methods such as formation, development and evolution of basins, geochemistry and paleoclimate of sediment forming, compaction and catagenesis after sediment accumulated. In addition to inorganic matter, the variation of chemical component and texture of organic matter heated in compaction and diagenetic change is also a part of environgelolgical records in basins. The object of environgeological research is to appraise the formation and latent energy of fossil fuel. The writers promulgated the difference of three basins in fossil fuel formation and potential power except for the resemblance in formation and envolution of basins, sedimentary geochemisty,paleoclimate,diagensis and hydrocarbon generated by studying environgeological records of three Cenozoic fault basins in Longchuan, Ruili and Baoshan in western Yunnan. The paper also indicates that the coal gas and oil of early maturity (low maturity)is fit for exploring in Longchuan basin and biogenic and coal types of gas of near surface in Baoshan. But the potential energy of fossil fuel is not good and probably there is few shallow biogenic gas only in Ruili basin.