渤海湾盆地古近纪超深水与极超深水沉积及油气地质意义

发布时间：2018-05-15 12:35

  本文选题：极超深水(≥ + m)　； 参考：《高校地质学报》2017年03期

【摘要】：沉积盆地古水深恢复及其演化是含油气盆地研究的重要内容之一,是烃源岩、储集层和盖层及油气成藏的控制因素之一。用地震方法解析三角洲前积层的厚度来研究水深是一个比较可靠的方法。文章采用这一方法,并结合部分测井、录井资料及岩心对渤海湾盆地北部的辽西凹陷、中部的南堡凹陷和近南部的东营凹陷沙三中期的古水深进行了研究,发现辽西凹陷在沙三中期发育了一个大型三角洲扇体,在其前缘相发育了含大量灰—深灰色撕裂泥砾的重力流沉积,并获得了辽西凹陷沙三中期最大古水深为1092 m;南堡凹陷沙三中期为一套暗色的泥页岩夹砂岩,最大古水深在552 m;东营凹陷沙三中期为一套暗色泥岩夹含暗色漂浮泥砾的粉砂岩,也为一套重力流沉积,结合史128井—牛43井地震测线的连井剖面,获得了最大古水深在681 m。这三个古水深揭示了整个渤海湾盆地在古近纪沙三中期是一个极超深水(≥500 m)的盆地,为形成大面积分布的优质烃源岩和大型含油气盆地奠定了一定的基础。
[Abstract]:The restoration and evolution of paleodepth in sedimentary basins is one of the important contents in the study of petroliferous basins and is one of the controlling factors of hydrocarbon source rocks, reservoirs and caprocks, as well as oil and gas accumulation. It is a reliable method to study the depth of water by using seismic method to analyze the thickness of delta front layer. This paper uses this method, combined with some logging, logging data and cores, to study the paleodepth of the middle stage of Sha3 in the northern Liaoxi sag, the central Nanpu depression and the near southern Dongying sag in the Bohai Bay basin. It is found that a large delta fan was developed in the middle stage of the third stage of the depression in the west of Liaoning Province, and the gravity flow deposits containing a large amount of gray-dark gray tearing mud gravel were developed in the front facies of the depression. The results show that the maximum paleodepth in middle stage of Sha3 is 1092 m, that in Nanpu sag is a set of dark shale-intercalated sandstone with the maximum paleo water depth of 552m.The middle stage of Sha3 in Dongying sag is a set of siltstone with dark floating mudstone. It is also a set of gravity flow deposition, and the maximum ancient water depth of 681 m is obtained by combining with the continuous well profile of the seismic logging line of Shi128 well Niu43 well. These three ancient water depths reveal that the whole Bohai Bay basin is a very deep water basin (鈮，

本文编号：1892488