蒙古某凹陷石油地质特征与成藏类型及控制因素

蒙古国某凹陷位于蒙古人民共和国东方省境内,行政上隶属于马特索木。海拉尔——塔木察格盆地地层从下到上依次分为基底、铜钵庙组、南屯组、大磨拐河组、伊敏组,而在该地区主要的勘探目的层为基底、铜钵庙组、南屯组地层。塔木察格盆地与海拉尔盆地、二连盆地等属于中亚—蒙古褶皱带的一部分,同属一个大地构造单元,均为中、新生代断陷盆地,其构造、沉积特征、盆地演化过程及石油地质条件具有一定的相似性。本次研究的凹陷主要分为东次凹和西次凹两大凹陷;而两个凹陷又各自成藏,各自都有自己的生、储、盖、运、集、保等特点。整个研究区构造运动复杂,断裂活动的期次多,地层沉积特征及充填序列复杂,整个凹陷的总体特征可以描述为多物源、短物源、多沉积体系、窄相带及扇体发育,油气成藏类型多、成藏模式、成藏控制因素及油气聚集多样化,增加了工作的强度和难度。

Nanbeier Tamtsag Basin in the Dongfang province of the Republic of Mongolia, under the control of Matesuomu, and North beside Xinbabuerhu in Hulun Buir City, Inner Mongolia Autonomous Region, Republic of China. The Hailar--Tamtsag group can be divided the basement rock ,Tongbomiao Group .Nantun Group .Damoguaihe Group .Yimin Group. The main exploration group in this area is the basement rock .Tongbomiao Group .Nantun Group. Tamtsag Basin and Hailar Basin, Erlian basin belong to the same part of Central Asia -- Mongolia fold and belong to the same tectonic units in Mesozoic and Cenozoic rift basin, and its structural characteristics, sedimentary characteristics, process of basin evolution oil and geological conditions are similar. This Basin include the east basin and the west basin, they have their central Reservoir type, and they have feature of bear, storage, cover, transport, gather, defend. The tectonic movement is complex in this region of interest,the time of fault active is much more , the characteristic of layer sediment and the filling rank are complicate. The total feature of the whole concave may description have more matter source and brief matter source and have more lithosomic body and narrow phase belt, and they developed fans. The intensity and difficulty of work have added, because they have more Reservoir type and Reservoir control element.