二连盆地乌兰花凹陷油气藏特征及分布规律

doi:10.3969/j.issn.1672-7703.2020.06.007

摘要/Abstract

摘要： 二连盆地历经30 余年的油气勘探，新凹陷和油气储量的发现难度越来越大。为进一步扩大勘探，近年来将新区凹陷的搜索扩大到盆地南缘的温都尔庙隆起，发现乌兰花凹陷具备较好的石油地质条件。通过对该凹陷石油地质特征和油气成藏条件研究，明确凹陷具有双断结构样式、湖盆成湖期早、火山活动频繁、晚期构造强烈等特征，其独特的地质条件，形成了碎屑岩、安山岩、花岗岩潜山等多种类型储层的油藏。指出“环洼构造是油气聚集区，古生界和白垩系多层系含油，优质储层控制油气富集”的油气成藏和分布规律，建立了乌兰花凹陷“多层系、多领域” 复式油气成藏模式，有效指导了该凹陷的油气勘探。通过近几年钻探，发现了一个5000 万吨级以上的油气储量接替区，成为二连盆地新区勘探的又一成功典范。

关键词: 二连盆地, 乌兰花凹陷, 成藏条件, 油气藏特征, 油气分布规律

Abstract: After more than 30 years of exploration in the Erlian Basin, it has become increasingly difficult to discover new sags and oil and gas reserves. In order to further expand the scope of exploration in the basin, the search for new sags has been extended in recent years to the Wenduermiao uplift in the southern margin of the basin, where it has been found that the Wulanhua sag has favorable petroleum geological conditions. Study of the petroleum geological characteristics and hydrocarbon accumulation conditions of the sag have determined that it has a duplex-fault structural pattern. It has experienced an early lake-basin-forming period, frequent episodes of volcanic activity, and strong late tectonic movements. Due to its unique geological conditions, various types of oil reservoirs have formed, such as clastic rock, andesite, and granite buried hill. The hydrocarbon accumulation and distribution laws have been determined, which can be stated as “hydrocarbon accumulation zone in the circum-sub-sag structure, multiple oil-bearing layers in the Paleozoic and Cretaceous, and oil and gas enrichment controlled by high-quality reservoirs”. A composite “multi-layer and multi-type” hydrocarbon accumulation model has been established in the Wulanhua sag, which now effectively guides oil and gas exploration in the sag. Recent drilling operations have discovered an oil and gas reserve replacement area with oil reserves of more than 50 million tons, representing another successful example of petroleum exploration in new areas in the Erlian Basin.

中图分类号:

邢雅文, 张以明, 降栓奇, 董雄英, 王元杰, 王宏霞, 许永忠. 二连盆地乌兰花凹陷油气藏特征及分布规律[J]. 中国石油勘探, 2020, 25(6): 68-78.

Xing Yawen, Zhang Yiming, Jiang Shuanqi, Dong Xiongying, Wang Yuanjie, Wang Hongxia, Xu Yongzhong. Characteristics and distribution of oil and gas reservoirs in the Wulanhua sag of the Erlian Basin[J]. China Petroleum Exploration, 2020, 25(6): 68-78.

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