南贝尔凹陷油气成藏条件与富集规律

南贝尔凹陷位于蒙古国塔木察格盆地,为中生代断陷盆地内小断陷.该凹陷具有断陷结构简单、多凸多凹、凹隆相间的构造格局,形成了多物源、多沉积中心的特点.铜钵庙组三角洲前缘砂体、南屯组(扇)三角洲前缘砂体和水下扇砂体为油气聚集成藏提供了良好的储集空间.在东次凹北洼槽南一段Ⅱ油组构造和沉积匹配较好的区域形成构造和岩性控制的岩性一...

Hydrocarbon accumulation conditions and enrichment rule in the South Buir

The South Buir is located in Tamtsag of Mongolia，being Mesozoic rifted basin.The half graben like fault depression with east fault and west overlap has the characteristics of multi source and multi depocenter，with simple faulted texture，and the tectonic framework of multi depression multi uplift and depression alternated，with uplift.The delta front sand body in Tongbomiao Formation，the subsea apron sand body and fan delta front sand body in Nantun Formation provide good reservoir space for hydrocarbon accumulation.Lithology structure reservoir of pay zone II of member I were developed in the north sag of east sub depression which had preferable structure coupled with deposition； sandstone interbeded with mudstone were developed well in the south sag of east sub depression which vertically had many oil bearing layers，so south sag of east sub depression could form composite reservoir.Many reservoir of pay zone II of member I concentrated relatively in the south sag which could lead to lithology structure reservoir controlled by lithology.Structural depositional setting，hydrocarbon kitchen，unconformable surface and various graded flooding surfaces control the lateral and vertical hydrocarbon distribution.